Patient radiation dose in prospectively gated axial CT coronary angiography and retrospectively gated helical technique with a 320-detector row CT scanner
Patient radiation dose in prospectively gated axial CT coronary angiography and retrospectively gated helical technique with a 320-detector row CT scanner
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DOI：
10.1118/1.3496985
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发表时间：
2010-11-01
期刊：
影响因子：
3.8
通讯作者：
Yamauchi-Kawaura, Chiyo
中科院分区：
文献类型：
--
作者：
Seguchi, Shigenobu;Aoyama, Takahiko;Yamauchi-Kawaura, Chiyo
目的：本研究的目的是评估前瞻性门控轴位（PGA）技术和回顾性门控螺旋（RGH）技术行CT冠状动脉造影（CTCA）患者的辐射剂量。方法：测量了320排CT扫描仪的辐射剂量（Toshiba Aqueolide ONE）使用小尺寸硅光电二极管剂量计，其被植入标准日本成年男性的拟人模型内的各种组织和器官位置。光电二极管剂量计的输出信号在个人计算机上读出，根据国际放射防护委员会103号出版物的指南计算器官和有效剂量。结果：接受高剂量的器官是乳房，其次是肺、食道和肝脏。在模拟心率为60次/分钟时，PGA技术和16%的相位窗口宽度获得的乳腺剂量为13 mGy，而RGH技术使用心电图依赖剂量调制，在与PGA技术相同的相位窗口宽度下获得的乳腺剂量为53 mGy。在这种情况下，PGA和RGH技术获得的有效剂量分别为4.7和20 mSv。PGA和RGH中剂量长度乘积到有效剂量的转换因子分别为0.022和0.025 mSv mGy（-1）cm（-1），扫描长度为140 mm。结论：使用PGA技术进行CTCA可提供实质性的有效剂量降低，即，70%-76%，与在与PGA技术相同的相位窗口使用剂量调制的RGH技术相比。尽管采用RGH技术的CTCA中的辐射剂量与常规冠状动脉造影（CCA）中的辐射剂量相同或略高，但使用PGA技术可将器官和有效剂量降低至低于CCA的水平（乳房剂量除外）。(C)2010年美国医学物理学家协会。[DOI：10.1118/1.3496985]
Purpose: The aim of this study was to evaluate radiation dose to patients undergoing computed tomography coronary angiography (CTCA) for prospectively gated axial (PGA) technique and retrospectively gated helical (RGH) technique.Methods: Radiation doses were measured for a 320-detector row CT scanner (Toshiba Aquilion ONE) using small sized silicon-photodiode dosimeters, which were implanted at various tissue and organ positions within an anthropomorphic phantom for a standard Japanese adult male. Output signals from photodiode dosimeters were read out on a personal computer, from which organ and effective doses were computed according to guidelines published in the International Commission on Radiological Protection Publication 103.Results: Organs that received high doses were breast, followed by lung, esophagus, and liver. Breast doses obtained with PGA technique and a phase window width of 16% at a simulated heart rate of 60 beats per minute were 13 mGy compared to 53 mGy with RGH technique using electrocardiographically dependent dose modulation at the same phase window width as that in PGA technique. Effective doses obtained in this case were 4.7 and 20 mSv for the PGA and RGH techniques, respectively. Conversion factors of dose length product to the effective dose in PGA and RGH were 0.022 and 0.025 mSv mGy(-1) cm(-1) with a scan length of 140 mm.Conclusions: CTCA performed with PGA technique provided a substantial effective dose reduction, i.e., 70%-76%, compared to RGH technique using the dose modulation at the same phase windows as those in PGA technique. Though radiation doses in CTCA with RGH technique were the same level as, or some higher than, those in conventional coronary angiography (CCA), the use of PGA technique reduced organ and effective doses to levels less than CCA except for breast dose. (C) 2010 American Association of Physicists in Medicine. [DOI: 10.1118/1.3496985]