A comparison of newborn stylized and tomographic models for dose assessment in paediatric radiology.
A comparison of newborn stylized and tomographic models for dose assessment in paediatric radiology.
复制标题
儿科放射学剂量评估新生儿程式化模型和断层扫描模型的比较。
DOI：
10.1088/0031-9155/48/7/301
复制
发表时间：
2003
影响因子：
3.5
通讯作者：
Bolch,WE
中科院分区：
文献类型：
--
作者：
Staton,RJ;Pazik,FD;Nipper,JC;Williams,JL;Bolch,WE
Establishment of organ doses from diagnostic and interventional examinations is a key component to quantifying the radiation risks from medical exposures and for formulating corresponding dose-reduction strategies. Radiation transport models of human anatomy provide a convenient method for simulating radiological examinations. At present, two classes of models exist: stylized mathematical models and tomographic voxel models. In the present study, organ dose comparisons are made for projection radiographs of both a stylized and a tomographic model of the newborn patient. Sixteen separate radiographs were simulated for each model at x-ray technique factors typical of newborn examinations: chest, abdomen, thorax and head views in the AP, PA, left LAT and right LAT projection orientation. For AP and PA radiographs of the torso (chest, abdomen and thorax views), the effective dose assessed for the tomographic model exceeds that for the stylized model with per cent differences ranging from 19%(AP abdominal view) to 43% AP chest view. In contrast, the effective dose for the stylized model exceeds that for the tomographic model for all eight lateral views including those of the head, with per cent differences ranging from 9%(LLAT chest view) to 51%(RLAT thorax view). While organ positioning differences do exist between the models, a major factor contributing to differences in effective dose is the models' exterior trunk shape. In the tomographic model, a more elliptical shape is seen thus providing for less tissue shielding for internal organs in the AP and PA directions, with corresponding increased tissue shielding in the lateral directions. This observation is opposite of that seen in comparisons of stylized and tomographic models of the adult.
