Dyakov I, Stoinova V, Groudeva V, Vassileva J
National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria
University Hospital St. Ekaterina, Sofia, Bulgaria.
Radiat Prot Dosimetry. 2015 Jul;165(1-4):182-4. doi: 10.1093/rpd/ncv114. Epub 2015 Apr 1.
The aim of the present study was to compare image quality and patient dose in cardiac computed tomography angiography (CTA) in terms of volume computed tomography dose index (CTDI vol), dose length product (DLP) and effective dose, when changing from filtered back projection (FBP) to adaptive iterative dose reduction (AIDR) reconstruction techniques. Further aim was to implement prospective electrocardiogram (ECG) gating for patient dose reduction. The study was performed with Aquilion ONE 320-row CT of Toshiba Medical Systems. Analysis of cardiac CT protocols was performed before and after integration of the new software. The AIDR technique showed more than 50 % reduction in CTDIvol values and 57 % in effective dose. The subjective evaluation of clinical images confirmed the adequate image quality acquired by the AIDR technique. The preliminary results indicated significant dose reduction when using prospective ECG gating by keeping the adequate diagnostic quality of clinical images.
本研究的目的是在从滤波反投影（FBP）重建技术转换为自适应迭代剂量降低（AIDR）重建技术时，根据容积计算机断层扫描剂量指数（CTDI vol）、剂量长度乘积（DLP）和有效剂量，比较心脏计算机断层扫描血管造影（CTA）中的图像质量和患者剂量。进一步的目的是实施前瞻性心电图（ECG）门控以降低患者剂量。本研究使用东芝医疗系统公司的Aquilion ONE 320排CT进行。在新软件整合前后对心脏CT协议进行了分析。AIDR技术使CTDIvol值降低了50%以上，有效剂量降低了57%。临床图像的主观评估证实了AIDR技术所获得的图像质量足够。初步结果表明，使用前瞻性ECG门控时，在保持临床图像足够诊断质量的同时，可显著降低剂量。
