Digital radiography systems can reduce radiation dose, this capability was harnessed to explore dose and image quality (IQ) optimisation strategies. Entrance surface dose (ESD), effective dose (ED) and organ doses were determined by the indirect method for patients undergoing pelvic anteroposterior X-ray examinations with computed radiography systems. The IQ of patients’ radiographs was assessed in terms of signal-to-noise ratio (SNR). An anthropomorphic phantom was exposed with varying tube potential (kVp), tube current-time product (mAs), and focus-to-detector distance (FDD) to determine phantom-entrance dose for the optimisation studies. SNR of each phantom radiograph was determined. Patients’ mean ESD of 2.38 ± 0.60 mGy, ED of 0.25 ± 0.07 mSv and SNR of 8.5 ± 2.2 were obtained. After optimisation, entrance dose was reduced by 29.2% with 5 cm increment in FDD, and 5 kVp reduction in tube potential. kVp and/or mAs reduction with an increment in FDD reduced entrance dose without adversely compromising radiographic-IQ.

中文翻译：

---

使用计算机放射成像系统进行患者剂量评估和优化盆腔放射成像

数字射线照相系统可以减少辐射剂量，这种能力被用来探索剂量和图像质量 (IQ) 优化策略。使用计算机X线摄影系统进行骨盆前后X射线检查的患者通过间接方法确定入口表面剂量（ESD）、有效剂量（ED）和器官剂量。根据信噪比 (SNR) 评估患者 X 光片的智商。用不同的管电位 (kVp)、管电流时间积 (mAs) 和焦点到探测器距离 (FDD) 暴露拟人体模，以确定用于优化研究的体模入口剂量。确定了每个幻影射线照片的 SNR。获得了患者的平均 ESD 为 2.38 ± 0.60 mGy、ED 为 0.25 ± 0.07 mSv 和 SNR 为 8.5 ± 2.2。优化后，入口剂量减少了29。2%，FDD 增加 5 cm，管电位降低 5 kVp。kVp 和/或 mAs 的降低随着 FDD 的增加而降低了入口剂量，而不会不利地影响 X 射线照相 IQ。