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Automatic segmentation of dura for quantitative analysis of lumbar stenosis: A deep learning study with 518 CT myelograms J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-11 Guoxin Fan, Yufeng Li, Dongdong Wang, Jianjin Zhang, Xiaokang Du, Huaqing Liu, Xiang Liao
BackgroundThe diagnosis of lumbar spinal stenosis (LSS) can be challenging because radicular pain is not often present in the culprit‐level localization. Accurate segmentation and quantitative analysis of the lumbar dura on radiographic images are key to the accurate differential diagnosis of LSS. The aim of this study is to develop an automatic dura‐contouring tool for radiographic quantification
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DenseNet model incorporating hybrid attention mechanisms and clinical features for pancreatic cystic tumor classification J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-08 Hui Tian, Bo Zhang, Zhiwei Zhang, Zhenshun Xu, Liang Jin, Yun Bian, Jie Wu
PurposeThe aim of this study is to develop a deep learning model capable of discriminating between pancreatic plasma cystic neoplasms (SCN) and mucinous cystic neoplasms (MCN) by leveraging patient‐specific clinical features and imaging outcomes. The intent is to offer valuable diagnostic support to clinicians in their clinical decision‐making processes.MethodsThe construction of the deep learning
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Beyond conventional bounds: Surpassing system limits for stereotactic ablative (SAbR) lung radiotherapy using CBCT‐based adaptive planning system J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-07 Yesenia Gonzalez, Justin Visak, Luke Overman, Chien‐Yi Liao, Allen Yen, Tingliang Zhuang, Bin Cai, Andrew Godley, Yuanyuan Zhang, Robert Timmerman, Puneeth Iyengar, Kenneth Westover, David Parsons, Mu‐Han Lin
PurposeOnline adaptive radiotherapy relies on a high degree of automation to enable rapid planning procedures. The Varian Ethos intelligent optimization engine (IOE) was originally designed for conventional treatments so it is crucial to provide clear guidance for lung SAbR plans. This study investigates using the Ethos IOE together with adaptive‐specific optimization tuning structures we designed
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Error detection for radiotherapy planning validation based on deep learning networks J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-06 Shupeng Liu, Jianhui Ma, Fan Tang, Yuqi Liang, Yanning Li, Zihao Li, Tingting Wang, Meijuan Zhou
BackgroundQuality assurance (QA) of patient‐specific treatment plans for intensity‐modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) necessitates prior validation. However, the standard methodology exhibits deficiencies and lacks sensitivity in the analysis of positional dose distribution data, leading to difficulties in accurately identifying reasons for plan verification
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Characterization of a novel pulse normalization technology for beam scanning of small fields without a reference chamber J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-03 Garrett C. Baltz, Steven M. Kirsner
PurposeA novel pulse normalization technology enabling the acquisition of low noise beam data without the use of a physical reference chamber has recently been commercially released. The purpose of this study was to characterize the use of this technology for beam scanning of small fields required in the commissioning of a stereotactic radiotherapy program.MethodsThree detectors (Edge diode, microDiamond
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Efficient EPID‐based quality assurance of beam time delay for respiratory‐gated radiotherapy with validation on Catalyst™ and AlignRT™ systems J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-02 Kaining Yao, Meijiao Wang, Yi Du, Jiacheng Liu, Qingying Wang, Ruoxi Wang, Hao Wu, Haizhen Yue
PurposeTo propose a straightforward and time‐efficient quality assurance (QA) approach of beam time delay for respiratory‐gated radiotherapy and validate the proposed method on typical respiratory gating systems, Catalyst™ and AlignRT™.MethodsThe QA apparatus was composed of a motion platform and a Winston‐Lutz cube phantom (WL3) embedded with metal balls. The apparatus was first scanned in CT‐Sim
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Development of a phantom for assessing the precision of setup in skin mark‐less surface‐guided radiotherapy J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-02 Masahide Saito, Koji Ueda, Hikaru Nemoto, Yoshiko Onishi, Hidekazu Suzuki, Toshihiro Suzuki, Naoki Sano, Takafumi Komiyama, Kan Marino, Hiroshi Onishi
BackgroundSurface‐guided radiotherapy (SGRT) is adopted by several institutions; however, reports on the phantoms used to assess the precision of the SGRT setup are limited.PurposeThe purpose of this study was to develop a phantom to verify the accuracy of the irradiation position during skin mark‐less SGRT.MethodsAn acrylonitrile butadiene styrene (ABS) plastic cube phantom with a diameter of 150
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Feasibility of patient‐specific quality assurance (PSQA) for real‐time robotic stereotactic body radiotherapy (SBRT) based on tumor motion traces J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-02 Qianyi Xu, Jiajin Fan, Yevgeniy Vinogradskiy, Ashish K. Chawla, Gregory Kubicek, Haihua Yang, Kiet Huynh, Tamara LaCouture, Jimm Grimm, Wei Nie
PurposeTo design a patient specific quality assurance (PSQA) process for the CyberKnife Synchrony system and quantify its dosimetric accuracy using a motion platform driven by patient tumor traces with rotation.MethodsThe CyberKnife Synchrony system was evaluated using a motion platform (MODUSQA) and a SRS MapCHECK phantom. The platform was programed to move in the superior‐inferior (SI) direction
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Calculation method for novel upright CT scanner isodose curves J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-02 Michael W. Kissick, Costanza Panaino, Anthony Criscuolo, John Hayes, Carson Hoffman, Rockwell Mackie, Andries N. Schreuder
PurposeA computational method based on Monte‐Carlo calculations is presented and used to calculate isodose curves for a new upright and tilting CT scanner useful for radiation protection purposes.MethodsThe TOPAS code platform with imported CAD files for key components was used to construct a calculation space for the scanner. A sphere of water acts as the patient would by creating scatter out of the
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Evaluation of Virtual Grid processed clinical pelvic radiographs J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-02 Tim Gossye, Dimitri Buytaert, Peter V. Smeets, Lieve Morbée, Elke Vereecke, Pieter‐Jan Kellens, Eric Achten, Klaus Bacher
BackgroundA physical scatter grid is not often used in pelvic bedside examinations. However, multiple studies regarding scatter correction software (SC SW) are available for mobile chest radiography but the results are unclear for pelvic radiography.PurposeWe evaluated SC SW of Fujifilm (Virtual Grid) on gridless pelvic radiographs obtained from a human Thiel‐embalmed body to investigate the potential
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Lateral response artifact correction method using image stitching technique in radiochromic film dosimetry J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-02 Hideharu Miura, Masanori Miyazawa, Shuichi Ozawa, Tsubasa Enosaki, Masayuki Kagemoto
PurposeLateral response artifact (LRA) is caused by the interaction between film and flatbed scanner in the direction perpendicular to the scanning direction. This can significantly affect the accuracy of patient‐specific quality assurance (QA) in cases involving large irradiation fields. We hypothesized that by utilizing the central area of the flatbed scanner, where the magnitude of LRA is relatively
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Perceptions on and roadblocks to implementation of standardized nomenclature in radiation oncology: A survey from TG‐263U1 J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-05-01 Elizabeth L. Covington, Krithika Suresh, Brian M. Anderson, Margaret Barker, Kathryn Dess, Jeremy G. Price, Alexander Moncion, Marissa J. Vaccarelli, Lakshmi Santanam, Ying Xiao, Charles Mayo
PurposeAAPM Task Group No. 263U1 (Update to Report No. 263 – Standardizing Nomenclatures in Radiation Oncology) disseminated a survey to receive feedback on utilization, gaps, and means to facilitate further adoption.MethodsThe survey was created by TG‐263U1 members to solicit feedback from physicists, dosimetrists, and physicians working in radiation oncology. Questions on the adoption of the TG‐263
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Tomotherapy in synchronous and metachronous bilateral breast cancer: Clinical experience J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-30 Yernar Orda, Tanzhas Shayakhmetov, Saniya Baiturova, Daulet Berikbol, Rauan Otynshiyev, Aigul Brimova, Bolat Saktashev, Ainur Baisalbayeva, Ainur Samigatova
Purpose of studyThe objective of this research is to present our firsthand experience and provide up‐to‐date data for the further study of cases involving simultaneous breast irradiation using helical Tomotherapy, ©Accuray Inc.MethodsThe radical treatment options for bilateral breast cancer are surgery, chemotherapy, and radiation therapy. Being that radiotherapy for bilateral breast cancer is challenging
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A slope method for the determination of electron energy for quality assurance J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-30 Larry W. Hill, David Jack
BackgroundParticle accelerators, manufactured for delivering patient radiation treatment, require numerous and frequent quality assurance measures. One of those is the periodic check for electron energy stability. The American Association of Physicists in Medicine has established requirements for this procedure. The current recommendation is to perform a ratio of two ionization points, one at Dmax
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A deep learning‐based 3D Prompt‐nnUnet model for automatic segmentation in brachytherapy of postoperative endometrial carcinoma J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-29 Xian Xue, Dazhu Liang, Kaiyue Wang, Jianwei Gao, Jingjing Ding, Fugen Zhou, Juan Xu, Hefeng Liu, Quanfu Sun, Ping Jiang, Laiyuan Tao, Wenzhao Shi, Jinsheng Cheng
PurposeTo create and evaluate a three‐dimensional (3D) Prompt‐nnUnet module that utilizes the prompts‐based model combined with 3D nnUnet for producing the rapid and consistent autosegmentation of high‐risk clinical target volume (HR CTV) and organ at risk (OAR) in high‐dose‐rate brachytherapy (HDR BT) for patients with postoperative endometrial carcinoma (EC).Methods and materialsOn two experimental
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Technical note: A comparison of in‐house 3D‐printed and commercially available patient‐specific skin collimators for use with electron beam therapy J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-26 Steven M. Herchko, Michael S. Rutenberg, Chris J. Beltran, Sridhar Yaddanapudi
PurposeSkin collimation is a useful tool in electron beam therapy (EBT) to decrease the penumbra at the field edge and minimize dose to nearby superficial organs at risk (OARs), but manually fabricating these collimation devices in the clinic to conform to the patient's anatomy can be a difficult and time intensive process. This work compares two types of patient‐specific skin collimation (in‐house
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Comparison of failure modes and effects analyses and time for brachytherapy ring and tandem applicator digitization between manual and solid applicator source placement methods J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-26 Adia L. Holtman, Dominic J. DiCostanzo, Charles A. Zimmerman, Gavin Graeper, Jeffrey Woollard, Daniel F. Christ, Ashley J. Cetnar
PurposeRing and tandem (R&T) applicator digitization is currently performed at our institution by manually defining the extent of the applicators. Digitization can also be achieved using solid applicators: predefined, 3D models with geometric constraints. This study compares R&T digitization using manual and solid applicator methods through Failure Modes and Effects Analyses (FMEAs) and comparative
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Utilizing collimated aperture with proton pencil beam scanning (PBS) for stereotactic radiotherapy J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-26 Chen‐Yu Chou, Tsung‐Shiau Tsai, Hsiao‐Chieh Huang, Jiun‐Jie Wang, Shen‐Hao Lee, Shih‐Ming Hsu
PurposeProton stereotactic radiosurgery (PSRS) has emerged as an innovative proton therapy modality aimed at achieving precise dose delivery with minimal impact on healthy tissues. This study explores the dosimetric outcomes of PSRS in comparison to traditional intensity‐modulated proton therapy (IMPT) by focusing on cases with small target volumes. A custom‐made aperture system designed for proton
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Dosimetric impact of contour editing on CT and MRI deep‐learning autosegmentation for brain OARs J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-26 Nouf M. Alzahrani, Ann M. Henry, Anna K. Clark, Bashar M. Al‐Qaisieh, Louise J. Murray, Michael G. Nix
PurposeTo establish the clinical applicability of deep‐learning organ‐at‐risk autocontouring models (DL‐AC) for brain radiotherapy. The dosimetric impact of contour editing, prior to model training, on performance was evaluated for both CT and MRI‐based models. The correlation between geometric and dosimetric measures was also investigated to establish whether dosimetric assessment is required for
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The impact of automatic tube current modulation related settings of a modern GE CT scanner on image quality and patient dose; details do matter J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-25 Ioannis A. Tsalafoutas, Shady AlKhazzam, Mohammed Hassan Kharita
PurposeTo investigate the operation principles of the automatic tube current modulation (ATCM) of a modern GE healthcare CT scanner, and the impact of related settings on image quality and patient dose.Material & MethodsA dedicated phantom (Mercury 4.0) was scanned using two of the most frequently used clinical scanning protocols (chest and abdomen‐pelvis). The preset protocol settings were used as
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Impact of abdominal compression on heart and stomach motion for stereotactic arrhythmia radioablation J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-25 Daniel David Cecchi, Nicolas Paul Ploquin, Salman Faruqi, Hali Morrison
PurposeTo evaluate the effectiveness of abdominal compression (AC) as a respiratory motion management method for the heart and stomach during stereotactic arrhythmia radioablation (STAR).Methods4D computed tomography (4DCT) scans of patients imaged with AC or without AC (free‐breathing: FB) were obtained from ventricular‐tachycardia (VT) (n = 3), lung cancer (n = 18), and liver cancer (n = 18) patients
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Electron streaming dose measurements and calculations on a 1.5 T MR‐Linac J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-25 Elizabeth Patterson, Marcus Powers, Peter E. Metcalfe, Dean Cutajar, Bradley M. Oborn, John A. Baines
PurposeTo evaluate the accuracy of different dosimeters and the treatment planning system (TPS) for assessing the skin dose due to the electron streaming effect (ESE) on a 1.5 T magnetic resonance (MR)‐linac.MethodSkin dose due to the ESE on an MR‐linac (Unity, Elekta) was investigated using a solid water phantom rotated 45° in the x‐y plane (IEC61217) and centered at the isocenter. The phantom was
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Advancing Alzheimer's research: Radiomics visualization of the default mode network in cerebral perfusion imaging J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-24 Danzhou Fang, Zhiming Zhou, Yalan Xiong, Yongzeng Fan, Yixuan Li, Huayi Zhao, Jiahui Huang, Gengbiao Yuan, Maohua Rao
ObjectiveAlzheimer's disease, an irreversible neurological condition, demands timely diagnosis for effective clinical intervention. This study employs radiomics analysis to assess image features in default mode network cerebral perfusion imaging among individuals with cognitive impairment.MethodsA radiomics analysis of cerebral perfusion imaging was conducted on 117 patients with cognitive impairment
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Clinical physicists’ perceptions of weekly chart checks and the potential role for automated image review assessed by structured interviews J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-23 Rachel Petragallo, Dishane C. Luximon, Jack Neylon, Naomi S. Bardach, Timothy Ritter, James M. Lamb
BackgroundThis study utilizes interviews of clinical medical physicists to investigate self‐reported shortcomings of the current weekly chart check workflow and opportunities for improvement.MethodsNineteen medical physicists were recruited for a 30‐minute semi‐structured interview, with a particular focus placed on image review and the use of automated tools for image review in weekly checks. Survey‐type
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Breast density quantification in dual‐energy mammography using virtual anthropomorphic phantoms J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-22 Gustavo Pacheco, Jorge Patricio Castillo‐Lopez, Yolanda Villaseñor‐Navarro, María‐Ester Brandan
PurposeBreast density is a significant risk factor for breast cancer and can impact the sensitivity of screening mammography. Area‐based breast density measurements may not provide an accurate representation of the tissue distribution, therefore volumetric breast density (VBD) measurements are preferred. Dual‐energy mammography enables volumetric measurements without additional assumptions about breast
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Automated treatment planning for whole breast irradiation with individualized tangential IMRT fields J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-20 Giulianne Rivelli Rodrigues Zaratim, Ricardo Gomes dos Reis, Marcos Antônio dos Santos, Nathalya Ala Yagi, Luis Felipe Oliveira e Silva
PurposesThis study aimed to develop and validate algorithms for automating intensity modulated radiation therapy (IMRT) planning in breast cancer patients, with a focus on patient anatomical characteristics.Material and MethodsWe retrospectively selected 400 breast cancer patients without lymph node involvement for automated treatment planning. Automation was achieved using the Eclipse Scripting Application
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Evaluation and mitigation of deformable image registration uncertainties for MRI‐guided adaptive radiotherapy J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-18 Hualiang Zhong, Kristofer K. Kainz, Eric S. Paulson
PurposeWe evaluate the performance of a deformable image registration (DIR) software package in registering abdominal magnetic resonance images (MRIs) and then develop a mechanical modeling method to mitigate detected DIR uncertainties.Materials and MethodsThree evaluation metrics, namely mean displacement to agreement (MDA), DICE similarity coefficient (DSC), and standard deviation of Jacobian determinants
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The impact of advancing the standard of care in radiotherapy on operational treatment resources J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-18 Michael Roumeliotis, Kundan Thind, Hali Morrison, Ben Burke, Kevin Martell, Lukas van Dyke, Lisa Barbera, Sarah Quirk
PurposeTo demonstrate the impact of implementing hypofractionated prescription regimens and advanced treatment techniques on institutional operational hours and radiotherapy personnel resources in a multi‐institutional setting. The study may be used to describe the impact of advancing the standard of care with modern radiotherapy techniques on patient and staff resources.MethodsThis study uses radiation
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First implementation of an innovative infra‐red camera system integrated into a mobile CBCT scanner for applicator tracking in brachytherapy—Initial performance characterization J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-16 Andre Karius, Lisa Marie Leifeld, Vratislav Strnad, Rainer Fietkau, Christoph Bert
PurposeTo enable a real‐time applicator guidance for brachytherapy, we used for the first time infra‐red tracking cameras (OptiTrack, USA) integrated into a mobile cone‐beam computed tomography (CBCT) scanner (medPhoton, Austria). We provide the first description of this prototype and its performance evaluation.MethodsWe performed assessments of camera calibration and camera‐CBCT registration using
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Novel utilization and quantification of Xsight diaphragm tracking for respiratory motion compensation in Cyberknife Synchrony treatment of liver tumors J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-16 Jianping Zhang, Lin Wang, Chenyu Xie, Zhiyu Yang, Benhua Xu, Xiaobo Li
PurposeThe Xsight lung tracking system (XLTS) utilizes an advanced image processing algorithm to precisely identify the position of a tumor and determine its location in orthogonal x‐ray images, instead of finding fiducials, thereby minimizing the risk of fiducial insertion‐related side effects. To assess and gauge the effectiveness of CyberKnife Synchrony in treating liver tumors located in close
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Characterization of a novel VenusX orthogonal dual‐layer multileaf collimator J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-15 Qingxin Wang, Qifeng Li, Zhongqiu Wang, Chengwen Yang, Daguang Zhang, Jun Wang, Ping Wang, Wei Wang
PurposeTo investigate and characterize the performance of a novel orthogonal dual‐layer alpha multileaf collimator (αMLC) mounted on the LinaTech VenusX linac.MethodsWe evaluated leaf positioning accuracy and reproducibility using an electronic portal imaging device through the picket fence test. The average, interleaf, intraleaf, and leaf tip transmissions of the single and dual layers were measured
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Implementation of a programmatic assessment model in radiation oncology medical physics training J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-15 Cathy Barbagallo, Kristy Osborne, Claire Dempsey
PurposeIn 2019, a formal review and update of the current training program for medical physics residents/registrars in Australasia was conducted. The purpose of this was to ensure the program met current local clinical and technological requirements, to improve standardization of training across Australia and New Zealand and generate a dynamic curriculum and programmatic assessment model.MethodsA four‐phase
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Design and implementation of automated notification systems and an electronic whiteboard for radiation therapy planning monitoring J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-14 Ping Yan, Jin Shen, Amar Basavatia, Madhur K. Garg, Wolfgang A. Tomé
PurposeRadiotherapy (RT) treatment and treatment planning is a complex process prepared and delivered by a multidisciplinary team of specialists. Efficient communication and notification systems among different team members are therefore essential to ensure the safe, timely delivery of treatments to patients.MethodTo address this issue, we developed and implemented automated notification systems and
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Physician scatter dose in interventional CT fluoroscopy J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-14 Emily A. Knott, Jonathan L. Troville, Carlos Alberto Reynoso, Sean D. Rose, Martin G. Wagner, Fred T. Lee, Jeffery L. Radtke, Daniel R. Anderson, Annie Zlevor, Meghan G. Lubner, J. Louis Hinshaw, Timothy P. Szczykutowicz
PurposeTo quantify operator dose in interventional CT fluoroscopy (CTF) procedures and compare to catheterization laboratory and interventional radiology procedures.MethodsFifteen studies quantifying operator scatter dose for c‐arm fluoroscopy and CTF were reviewed from a literature survey. The dose provided in each study was normalized to skin entrance air kerma and air kerma rate including backscatter
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Evaluating automatically generated normal tissue contours for safe use in head and neck and cervical cancer treatment planning J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-13 Raphael Douglas, Adenike Olanrewaju, Raymond Mumme, Lifei Zhang, Beth M. Beadle, Laurence Edward Court
PurposeVolumetric‐modulated arc therapy (VMAT) is a widely accepted treatment method for head and neck (HN) and cervical cancers; however, creating contours and plan optimization for VMAT plans is a time‐consuming process. Our group has created an automated treatment planning tool, the Radiation Planning Assistant (RPA), that uses deep learning models to generate organs at risk (OARs), planning structures
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Monte Carlo evaluation of uncertainties in photon and electron TG‐51 absorbed dose calibration J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-12 Patrick N. McDermott
PurposeThe accuracy of dose delivery to all patients treated with medical linacs depends on the accuracy of beam calibration. Dose delivery cannot be any more accurate than this. Given the importance of this, it seems worthwhile taking another look at the expected uncertainty in TG‐51 photon dose calibration and a first look at electron calibration. This work builds on the 2014 addendum to TG‐51 for
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An adult and pediatric size‐based contrast administration reduction phantom study for single and dual‐energy CT through preservation of contrast‐to‐noise ratio J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-12 Jia Wang, Xinhui Duan, Usman Mahmood, Sarah Eva McKenney, Samuel Loren Brady
BackgroundGlobal shortages of iodinated contrast media (ICM) during COVID‐19 pandemic forced the imaging community to use ICM more strategically in CT exams.PurposeThe purpose of this work is to provide a quantitative framework for preserving iodine CNR while reducing ICM dosage by either lowering kV in single‐energy CT (SECT) or using lower energy virtual monochromatic images (VMI) from dual‐energy
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Impact of proton PBS machine operating parameters on the effectiveness of layer rescanning for interplay effect mitigation in lung SBRT treatment J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-09 Xiaoying Liang, Chunbo Liu, Jiajian Shen, Stella Flampouri, Justin C. Park, Bo Lu, Sridhar Yaddanapudi, Jun Tan, Keith M. Furutani, Chris J. Beltran
BackgroundRescanning is a common technique used in proton pencil beam scanning to mitigate the interplay effect. Advances in machine operating parameters across different generations of particle therapy systems have led to improvements in beam delivery time (BDT). However, the potential impact of these improvements on the effectiveness of rescanning remains an underexplored area in the existing research
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Image quality characterization of an ultra‐high‐speed kilovoltage cone‐beam computed tomography imaging system on an O‐ring linear accelerator J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-05 Euidam Kim, Yang Kyun Park, Tianyu Zhao, Eric Laugeman, Xiaodong Neo Zhao, Yao Hao, Yoonsun Chung, Hugh Lee
PurposeThe quality of on‐board imaging systems, including cone‐beam computed tomography (CBCT), plays a vital role in image‐guided radiation therapy (IGRT) and adaptive radiotherapy. Recently, there has been an upgrade of the CBCT systems fused in the O‐ring linear accelerators called HyperSight, featuring a high imaging performance. As the characterization of a new imaging system is essential, we
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Dosimetric validation of intensity‐modulated bolus electron conformal therapy planning and delivery using an anthropomorphic cylindrical head phantom J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-05 Andrew S. McGuffey, Garrett M. Pitcher, Kevin J. Erhart, Kenneth R. Hogstrom
PurposeThis work investigated the dosimetric accuracy of the intensity‐modulated bolus electron conformal therapy (IM‐BECT) planning and delivery process using the decimal ElectronRT (eRT) treatment planning system.MethodsAn IM‐BECT treatment plan was designed using eRT for a cylindrical, anthropomorphic retromolar trigone phantom. Treatment planning involved specification of beam parameters and design
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Assessing the sensitivity and suitability of a range of detectors for SIMT PSQA J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-03 Leon Dunn, Alessia Tamborriello, Brindha Subramanian, Xiaolei Xu, Tyrone Te Ruruku
PurposeSingle‐isocenter multi‐target intracranial stereotactic radiotherapy (SIMT) is an effective treatment for brain metastases with complex treatment plans and delivery optimization necessitating rigorous quality assurance. This work aims to assess five methods for quality assurance of SIMT treatment plans in terms of their suitability and sensitivity to delivery errors.MethodsSun Nuclear ArcCHECK
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Repurposing DailyQA3 for an efficient and spot position sensitive daily quality assurance tool for proton therapy J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-04-02 Hong Qi Tan, Calvin Wei Yang Koh, Kah Seng Lew, Ping Lin Yeap, Clifford Ghee Ann Chua, James Kuan Huei Lee, Yun Ming Wong, Andrew Wibawa, Zubin Master, James Cheow Lei Lee, Sung Yong Park
IntroductionDaily quality assurance is an integral part of a radiotherapy workflow to ensure the dose is delivered safely and accurately to the patient. It is performed before the first treatment of the day and needs to be time and cost efficient for a multiple gantries proton center. In this study, we introduced an efficient method to perform QA for output constancy, range verification, spot positioning
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Commissioning and clinical implementation of an independent dose calculation system for scanned proton beams J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-30 Ralf Dreindl, Marta Bolsa‐Ferruz, Rosa Fayos‐Sola, Fatima Padilla Cabal, Lukas Scheuchenpflug, Alessio Elia, Antonio Amico, Antonio Carlino, Markus Stock, Loïc Grevillot
PurposeExperimental patient‐specific QA (PSQA) is a time and resource‐intensive process, with a poor sensitivity in detecting errors. Radiation therapy facilities aim to substitute it by means of independent dose calculation (IDC) in combination with a comprehensive beam delivery QA program. This paper reports on the commissioning of the IDC software tool myQA iON (IBA Dosimetry) for proton therapy
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Comprehensive beam delivery latency evaluation for gated proton therapy system using customized multi‐channel signal acquisition platform J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-29 Zhipeng Liu, Lingjing Pan, Tao Ma, Hsiao‐Ming Lu, Yuanyuan Wang
PurposeBeam delivery latency in respiratory‐gated particle therapy systems is a crucial issue to dose delivery accuracy. The aim of this study is to develop a multi‐channel signal acquisition platform for investigating gating latencies occurring within RPM respiratory gating system (Varian, USA) and ProBeam proton treatment system (Varian, USA) individually.MethodsThe multi‐channel signal acquisition
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Multi‐scale nested UNet with transformer for colorectal polyp segmentation J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-29 Zenan Wang, Zhen Liu, Jianfeng Yu, Yingxin Gao, Ming Liu
BackgroundPolyp detection and localization are essential tasks for colonoscopy. U‐shape network based convolutional neural networks have achieved remarkable segmentation performance for biomedical images, but lack of long‐range dependencies modeling limits their receptive fields.PurposeOur goal was to develop and test a novel architecture for polyp segmentation, which takes advantage of learning local
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A prior‐information‐based automatic segmentation method for the clinical target volume in adaptive radiotherapy of cervical cancer J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-28 Xuanhe Wang, Yankui Chang, Xi Pei, Xie George Xu
ObjectiveAdaptive planning to accommodate anatomic changes during treatment often requires repeated segmentation. In this study, prior patient‐specific data was integrateda into a registration‐guided multi‐channel multi‐path (Rg‐MCMP) segmentation framework to improve the accuracy of repeated clinical target volume (CTV) segmentation.MethodsThis study was based on CT image datasets for a total of 90
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Technical note: A comparison of physician doses in C‐Arm and CT fluoroscopy procedures J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-27 Jonathan Troville, Emily Knott, Carlos Alberto Reynoso‐Mejia, Martin Wagner, Fred T. Lee, Timothy P. Szczykutowicz
PurposeWe address the misconception that the typical physician dose is higher for CT fluoroscopy (CTF) procedures compared to C‐Arm procedures.MethodsWe compare physician scatter doses using two methods: a literature review of reported doses and a model based on a modified form of the dose area product (DAP). We define this modified form of DAP, “cumulative absorbed DAP,” as the product of the area
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Establishment and preliminary application of personalized three‐dimensional reconstruction of thyroid gland with automatic detection of thyroid nodules based on ultrasound videos J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-26 Huang Yandong, Zhang Shiqi, Jia Lanting, Hu Wenxin, Chen Leyao, Huang Hejing
PurposeA well display of the spatial location of thyroid nodules in the thyroid is important for surgical path planning and surgeon‐patient communication. The aim of this study was to establish a three‐dimensional (3D) reconstruction method of the thyroid gland, thyroid nodule, and carotid artery with automatic detection based on two‐dimensional (2D) ultrasound videos, and to evaluate its clinical
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Skin marker combined with surface‐guided auto‐positioning for breast DIBH radiotherapy daily initial patient setup: An optimal schedule for both accuracy and efficiency J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-24 Jianjun Lai, Zhizeng Luo, Lu Jiang, Haili Hu, Chang Gao, Chuanfeng Zhang, Liting Chen, Jing Wu, Zhibing Wu
Background and purposeBy employing three surface‐guided radiotherapy (SGRT)‐assisted positioning methods, we conducted a prospective study of patients undergoing SGRT‐based deep inspiration breath‐hold (DIBH) radiotherapy using a Sentine/Catalys system. The aim of this study was to optimize the initial positioning workflow of SGRT‐DIBH radiotherapy for breast cancer.Materials and methodsA total of
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The value of global collaborations J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-24 Chris Trauernicht, Laurence Court
We would like to review our experience of a successful global collaboration between institutions in the United States, South Africa, and several other countries. Specifically, after working together for 8 years, we would like to share this experience and encourage others to initiate similar collaborations towards reducing inequities in health care across the world. We first met at a training course
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ACR benchmark testing of a novel high‐speed ring‐gantry linac kV‐CBCT system J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-23 Allison Haertter, Michael Salerno, Brandon Koger, Christopher Kennedy, Michelle Alonso‐Basanta, Lei Dong, Boon‐Keng Teo, Taoran Li
A new generation cone‐beam computed tomography (CBCT) system with new hardware design and advanced image reconstruction algorithms is available for radiation treatment simulation or adaptive radiotherapy (HyperSight CBCT imaging solution, Varian Medical Systems‐a Siemens Healthineers company). This study assesses the CBCT image quality metrics using the criteria routinely used for diagnostic CT scanner
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A target containing phantom for accuracy assessment of cone‐beam CT‐guided histotripsy J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-18 Ayca Z. Kutlu, Grace M. Minesinger, Paul F. Laeseke, Michael Speidel, Martin G. Wagner
PurposeHistotripsy is a nonionizing, noninvasive, and nonthermal focal tumor therapy. Cone‐beam computed tomography (CBCT) guidance was developed for targeting tumors not visible on ultrasound. This approach assumes cavitation is formed at the geometrical focal point of the therapy transducer. In practice, the exact location might vary slightly between transducers. In this study, we present a phantom
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Characterization of the IDENTIFYTM surface scanning system for radiation therapy setup on a closed-bore linac J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-18 Janita Dekker, Sander van het Schip, Marion Essers, Mariska de Smet, Martijn Kusters, Willy de Kruijf
In radiation therapy, surface guidance can be used for patient setup and intra-fraction motion monitoring. The surface guided radiation therapy (SGRT) system from Varian Medical systems, IDENTIFYTM, consists of three pods, including cameras and a random pattern projector, mounted on the ceiling. The information captured by the cameras is used to make a reconstruction of the surface. The aim of the
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Analysis of left ventricle regional myocardial motion for cardiac radioablation J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-17 Justin Poon, Richard B. Thompson, Marc W. Deyell, Devin Schellenberg, Haley Clark, Stefan Reinsberg, Steven Thomas
PurposeLeft ventricle (LV) regional myocardial displacement due to cardiac motion was assessed using cardiovascular magnetic resonance (CMR) cine images to establish region‐specific margins for cardiac radioablation treatments.MethodsCMR breath‐hold cine images and LV myocardial tissue contour points were analyzed for 200 subjects, including controls (n = 50) and heart failure (HF) patients with preserved
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Error detection using a multi‐channel hybrid network with a low‐resolution detector in patient‐specific quality assurance J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-16 Bing Yan, Jun Shi, Xudong Xue, Hu Peng, Aidong Wu, Xiao Wang, Chi Ma
PurposeThis study aimed to develop a hybrid multi‐channel network to detect multileaf collimator (MLC) positional errors using dose difference (DD) maps and gamma maps generated from low‐resolution detectors in patient‐specific quality assurance (QA) for Intensity Modulated Radiation Therapy (IMRT).MethodsA total of 68 plans with 358 beams of IMRT were included in this study. The MLC leaf positions
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Dual‐branch feature fusion S3D V‐Net network for lung nodules segmentation J. Appl. Clin. Med. Phys. (IF 2.1) Pub Date : 2024-03-13 Xiaoru Xu, Lingyan Du, Dongsheng Yin
BackgroundAccurate segmentation of lung nodules can help doctors get more accurate results and protocols in early lung cancer diagnosis and treatment planning, so that patients can be better detected and treated at an early stage, and the mortality rate of lung cancer can be reduced.PurposeCurrently, the improvement of lung nodule segmentation accuracy has been limited by his heterogeneous performance