Dose evaluation and effective dose estimation from multi detector CT.
Dose evaluation and effective dose estimation from multi detector CT.
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多探测器 CT 的剂量评估和有效剂量估计。
DOI：
10.11323/jjmp2000.22.3_152
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Takayama
中科院分区：
文献类型：
--
作者：
K. Nishizawa;M. Matsumoto;K. Iwai;A. Tonari;Takashi Yoshida;M. Takayama
计算机断层扫描（CT）通过设备的改进和包括计算机在内的外围设备的进步而显著发展。1999年，多排螺旋CT（MDCT）出现，使快速高速扫描成为可能。然而，在适当评估暴露剂量之前，无法评估MDCT在实际临床应用中的有用性。由于CT检查需要相对较高的剂量，因此有必要评估患者暴露以引入MDCT。对于胸部和骨盆扫描病例，评价了三种MDCT的患者剂量。检查条件与实际临床检查相同。胸部检查的有效剂量为9.4-28 mSv，骨盆检查的有效剂量为13-28 mSv。胸部检查的平均表面剂量在16-43 mGy之间变化，腹部-骨盆的平均表面剂量在20-37 mGy之间变化。盆腔检查的最高表面剂量为57 mGy。不同的扫描方法和成像条件（如管电流、层厚等），照射剂量不同，MDCT检查中通过适当调整扫描条件，似乎有降低剂量的空间。
Computed tomography (CT) has evolved remarkably through device improvement and advancement of peripherals, including computers. In 1999, multi detector-row CT (MDCT) appeared and rapid high-speed scanning became possible. However, usefulness of MDCT in actual clinical application cannot be assessed until the exposure doses are assessed appropriately. Since CT examinations need a comparatively high dose, it is necessary to evaluate patient exposure for introduction of MDCT. Patient doses by three types of MDCTs were evaluated for cases of scanning of the chest and abdomen-pelvis. The examination conditions were the same as those in actual clinical examinations. The obtained effective doses were 9.4-28 mSv for the chest examination and 13-28 mSv for the abdomen-pelvis. The average surface doses varied between 16-43 mGy for the chest examination and 20-37 mGy for the abdomen-pelvis. The highest surface dose was 57 mGy for the abdomen-pelvis examination. The exposed doses differed according to scanning method and imaging conditions such as tube current, slice thickness and so on. It seemed that there is room for dose reduction by proper adjustment of scan conditions in MDCT examinations.