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Automated Estimation of Abdominal Effective Diameter for Body Size Normalization of CT Dose

机译:腹部有效直径的自动估计,可实现CT剂量体型正常化

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Most CT dose data aggregation methods do not currently adjust dose values for patient size. This work proposes a simple heuristic for reliably computing an effective diameter of a patient from an abdominal CT image. Evaluation of this method on 106 patients scanned on Philips Brilliance 64 and Brilliance Big Bore scanners demonstrates close correspondence between computed and manually measured patient effective diameters, with a mean absolute error of 1.0 cm (error range +2.2 to −0.4 cm). This level of correspondence was also demonstrated for 60 patients on Siemens, General Electric, and Toshiba scanners. A calculated effective diameter in the middle slice of an abdominal CT study was found to be a close approximation of the mean calculated effective diameter for the study, with a mean absolute error of approximately 1.0 cm (error range +3.5 to −2.2 cm). Furthermore, the mean absolute error for an adjusted mean volume computed tomography dose index (CTDIvol) using a mid-study calculated effective diameter, versus a mean per-slice adjusted CTDIvol based on the calculated effective diameter of each slice, was 0.59 mGy (error range 1.64 to −3.12 mGy). These results are used to calculate approximate normalized dose length product values in an abdominal CT dose database of 12,506 studies.
机译:大多数CT剂量数据汇总方法当前不调整患者大小的剂量值。这项工作提出了一种简单的启发式方法,可以从腹部CT图像可靠地计算出患者的有效直径。对在Philips Brilliance 64和Brilliance Big Bore扫描仪上扫描的106位患者进行的此方法的评估表明,计算出的和手动测量的患者有效直径之间存在密切的对应关系,平均绝对误差为1.0厘米(误差范围+2.2至-0.4厘米)。在60名患者的西门子,通用电气和东芝扫描仪上也证明了这种对应水平。发现腹部CT研究的中间切片中计算出的有效直径与该研究的平均计算出的有效直径非常接近,平均绝对误差约为1.0厘米(误差范围+3.5至-2.2厘米)。此外,使用中间研究计算的有效直径的调整后平均体积计算机断层摄影剂量指数(CTDIvol)的平均绝对误差与基于每个切片的计算有效直径的平均每切片调整后的CTDIvol的平均绝对误差为0.59 mGy(误差范围1.64至−3.12 mGy)。这些结果用于计算12506次腹部CT剂量数据库中的近似标准化剂量长度乘积值。

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