McCollough C H, Liu H H
Department of Diagnostic Radiology, Rochester, MN 55905, USA.
Radiology. 1995 Jul;196(1):153-7. doi: 10.1148/radiology.196.1.7784559.
To measure the breast dose and dose distribution from examinations performed with electron-beam computed tomography (CT).
Radiographic film was placed bilaterally at three depths in the breasts of an anthropomorphic phantom and exposed with clinically relevant protocols. The average breast dose and the dose distribution were obtained from the digitized and calibrated film and compared with those obtained with conventional CT.
Breast doses from electron-beam CT chest, coronary artery calcium, and cardiac function examinations were 21.9, 2.87, and 1.55 mGy, respectively. Within the breast, the dose decreased linearly by a factor of three from the axilla to the sternum. The breast dose from a conventional CT chest examination ranged from 18 to 33 mGy and did not vary substantially across the breast.
For chest examinations, the average breast dose from an electron-beam CT scanner was comparable to that from conventional CT scanners, despite the differences in dose distribution.
测量电子束计算机断层扫描（CT）检查时的乳腺剂量及剂量分布。
在仿真人体模型的双侧乳腺三个深度处放置射线胶片，并用临床相关方案进行照射。从数字化和校准后的胶片获得平均乳腺剂量和剂量分布，并与传统CT获得的结果进行比较。
电子束CT胸部、冠状动脉钙化和心功能检查的乳腺剂量分别为21.9、2.87和1.55毫戈瑞。在乳腺内，从腋窝到胸骨剂量呈线性下降，降幅为三分之一。传统CT胸部检查的乳腺剂量范围为18至33毫戈瑞，且在整个乳腺内变化不大。
对于胸部检查，尽管剂量分布存在差异，但电子束CT扫描仪的平均乳腺剂量与传统CT扫描仪相当。
