Resten Arnaud, Mausoleo Franck, Valero M, Musset Dominique
Service de Radiologie, Hôpital Antoine Béclère, 157 rue de la Porte de Trivaux, 92140 Clamart, France.
Eur Radiol. 2003 Jul;13(7):1515-21. doi: 10.1007/s00330-002-1522-z. Epub 2002 Jul 4.
The objective of this study was to compare the radiation exposure delivered by helical CT and pulmonary angiography (PA) for the detection of pulmonary embolism (PE), with an anthropomorphic phantom. A preliminary survey defined a representative standard procedure for helical CT and PA ( n=148) by choosing the exposure settings most frequently used. Then, radiation doses were measured with thermoluminescent dosimeters TLD 100 (Lif) introduced into the depth of an anthropomorphic phantom. Average doses were approximately five times smaller with helical CT than with PA (6.4+/-1.5 and 28+/-7.6 mGy, respectively). The most important doses were abreast the pulmonary apex for CT, and abreast the pulmonary arteries for PA. Compared with PA, helical CT dose distribution was relatively uniform (10-13 mGy). Finally, concerning abdomen and pelvis, doses were more important for PA than for CT scan (0.06-2.86 and 0.2-11.5 mGy, respectively). For the diagnostics of PE, radiation exposure is five times smaller with helical CT than with pulmonary angiography.
本研究的目的是使用人体模型比较螺旋CT和肺血管造影（PA）在检测肺栓塞（PE）时的辐射剂量。一项初步调查通过选择最常用的曝光设置，确定了螺旋CT和PA（n = 148）的代表性标准程序。然后，使用引入人体模型深度的热释光剂量计TLD 100（Lif）测量辐射剂量。螺旋CT的平均剂量比PA小约五倍（分别为6.4±1.5和28±7.6 mGy）。CT最重要的剂量位于肺尖水平，PA最重要的剂量位于肺动脉水平。与PA相比，螺旋CT的剂量分布相对均匀（10 - 13 mGy）。最后，在腹部和骨盆方面，PA的剂量比CT扫描更重要（分别为0.06 - 2.86和0.2 - 11.5 mGy）。对于PE的诊断，螺旋CT的辐射暴露比肺血管造影小五倍。
