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ACCURACY OF CT NUMBERS OBTAINED BY DIRA AND MONOENERGETIC PLUS ALGORITHMS IN DUAL-ENERGY COMPUTED TOMOGRAPHY
Radiation Protection Dosimetry ( IF 1 ) Pub Date : 2021-06-22 , DOI: 10.1093/rpd/ncab108
Maria Magnusson 1, 2, 3 , Michael Sandborg 2, 3 , Gudrun Alm Carlsson 2, 3 , Lilian Henriksson 2, 3 , Åsa Carlsson Tedgren 2, 3, 4 , Alexandr Malusek 2, 3
Affiliation  

Dual-energy computed tomography (CT) can be used in radiotherapy treatment planning for the calculation of absorbed dose distributions. The aim of this work is to evaluate whether there is room for improvement in the accuracy of the Monoenergetic Plus algorithm by Siemens Healthineers. A Siemens SOMATOM Force scanner was used to scan a cylindrical polymethyl methacrylate phantom with four rod-inserts made of different materials. Images were reconstructed using ADMIRE and processed with Monoenergetic Plus. The resulting CT numbers were compared with tabulated values and values simulated by the proof-of-a-concept algorithm DIRA developed by the authors. Both the Monoenergetic Plus and DIRA algorithms performed well; the accuracy of attenuation coefficients was better than about ±1% at the energy of 70 keV. Compared with DIRA, the worse performance of Monoenergetic Plus was caused by its (i) two-material decomposition to iodine and water and (ii) imperfect suppression of the beam hardening artifact in ADMIRE.

中文翻译:

DIRA 和单能 PLUS 算法在双能计算机断层扫描中获得的 CT 数值的准确性

双能计算机断层扫描 (CT) 可用于放射治疗计划,以计算吸收剂量分布。这项工作的目的是评估 Siemens Healthineers 的 Monoenergetic Plus 算法的准确性是否有改进的空间。西门子 SOMATOM Force 扫描仪用于扫描圆柱形聚甲基丙烯酸甲酯体模,该体模具有四个由不同材料制成的棒状插入物。使用 ADMIRE 重建图像并使用 Monoenergetic Plus 进行处理。将得到的 CT 数字与表格值和作者开发的概念验证算法 DIRA 模拟的值进行比较。Monoenergetic Plus 和 DIRA 算法都表现良好;在70 keV的能量下衰减系数的精度优于±1%左右。与DIRA相比,
更新日期:2021-06-22
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