胸部断层融合辐射剂量的计算和与其他胸部成像方式的剂量对比  

Exposure dose calculation of digital tomosynthesis and in comparison with other chest examinations

作　　者：马乐[1] 朱明欣[2] 秦耿耿[1] 何子龙[1] 蔡裕兴[1] 陈卫国[1] MA Le ZHU Mingxin QIN Genggeng HE Zilong CAI Yuxing CHEN Weiguo(Department of Radiology, Nan fang Hospital of Southern Medical University, Guangzhou 510515, China Department of Radiology, Nanhai Hospital, Southern Medical University, Foshan 528200, China)

机构地区：[1]南方医科大学南方医院放射科,广东广州510515 [2]南方医科大学附属南海医院放射科,广东佛山528200

出　　处：《中国介入影像与治疗学》2017年第1期50-53,共4页Chinese Journal of Interventional Imaging and Therapy

基　　金：广东省科技计划项目基金(2016ZC0058;2015B020233002;2015B020233008);广州市科技计划项目基金(201604020058)

摘　　要：目的提出一种计算胸部数字断层融合(DTS)辐射剂量的简单方法,并验证该方法的有效性;并比较DTS与胸部数字X线摄影(DR)、双能量减影(DES)、低剂量CT(LDCT)、常规CT的辐射剂量。方法对30例患者进行DTS检查,基于曝光参数提出及验证一种计算空气比释动能和剂量面积乘积的简单方法和校正因子。另收集接受DR、DES、LDCT和CT检查患者各30例,比较5种成像方式的有效剂量。结果空气比释动能和剂量面积乘积的校正因子分别为0.97和0.93,两参数预测值与实际值间的相对偏差为(0.5±0.4)%和(0.3±0.3)%。胸部DR、DES、DTS、LDCT、CT的ED差异有统计学意义(F=1 148.09,P<0.01),且除胸部DR与DES差异无统计学意义外,余成像方式两两比较差异均有统计学意义(P均<0.05)。结论本文所提出的预测DTS辐射剂量的简单计算方法,不需对每张断层图像的剂量进行叠加。相比于LDCT和CT,DTS具有低剂量优势;相比于DR和DES,DTS可通过三维成像提供更多信息。Objective To propose a simple method of calculating exposure dose in chest tomosynthesis （DTS） whose validity was verified, and to compare the expose paremeters of DTS with other chest examinations of digital radiology （DR）, dual energy subtraction （DES）, low-dose CT （LDCT） and conventional CT. Methods Thirty subjects were recruited for the DTS examination. Based on the exposure parameters from scout view, a calculation method and two correction factors were proposed and validated for air kerma and dose-area product （DAP） calculation. Besides, 30 subjects participated in the DR examination, 30 for DES examination, 30 for LDCT examination and another 30 for CT examination. The difference of effective dose （ED） among five chest examinations was investigated. Results Two correction factors of 0.97 and 0.93 for air kerma and DAP were determined, respectively. Small average differences of （0.5±0.4）% and （0.3±0.3）% were found between estimated values and actual values. ED of DR, DES, DTS, LDCT, CT had statistical significance （F=1 148.09, P〈0.01）, and besides the ED of DR and DES had no difference, there were significant differences between each other two imaging methods （all P〈0.05）. Conclusion A simple method to estimate DTS exposure dose is proposed and validated with no need to superimpose the dose from each image. DTS has lower exposure dose when compared with LDCT and CT, and provides three-dimensional imaging for obtaining more information when compared with DR and DES.

关 键 词：胸部 断层融合 辐射剂量 

分 类 号：R816.4[医药卫生—放射医学]