Beeres Martin, Juhee Kang, Bucher Andreas M, Frellesen Claudia, Albrecht Moritz, Wichmann Julian L, Park Clara, Kaup Moritz, Scholtz Jan Erik, Vogl Thomas J, Gruber-Rouh Tatjana, Bodelle Boris
From the Department of Diagnostic and Interventional Radiology, Clinic of the Goethe University, Frankfurt, Germany.
J Comput Assist Tomogr. 2017 Sep/Oct;41(5):817-822. doi: 10.1097/RCT.0000000000000602.
The aim of this study was to evaluate the impact of automated attenuation-based tube potential selection (ATPS) on image quality and radiation dose exposure parameters at a computed tomography angiography (CTA) lower-extremity runoff.
Two hundred forty patients (156 men, 84 women) underwent CTA examinations of the lower-extremity runoff on a second-generation dual-source computed tomography system: 120 patients at a fixed tube potential of 120 kV and a tube current of 180 reference mAs, another 120 patients using automated ATPS. Volume computed tomography dose index (CTDIvol), dose-length-product (DLP), body diameters, noise, signal-to-noise ratio, and subjective image quality were compared.
In the ATPS group, 80 kV was automatically selected in 102 patients, 100 kV in 15 patients, and 120 kV in 3 patients; 140 kV was not chosen in any of the cases. The median CTDIvol of 4.81 mGy (2.2-10.6 mGy) and DLP of 568 mGy⋅cm (203-1324 mGy⋅cm) in the ATPS group were significantly lower compared with the CTDIvol of 8.1 mGy (4.4-14.4 mGy) and DLP of 1027.5 mGy⋅cm (509-1806 mGy⋅cm) in the fixed 120-kV group (P < 0.01). Image quality was comparable (P > 0.05).
Automated ATPS allows for significant dose savings in lower-extremity runoff CTA, whereas image quality remains constant at a high level.
本研究旨在评估基于自动衰减的管电压选择（ATPS）对下肢CT血管造影（CTA）检查中图像质量和辐射剂量暴露参数的影响。
240例患者（156例男性，84例女性）在第二代双源计算机断层扫描系统上接受下肢CTA检查：120例患者采用固定管电压120 kV和管电流180参考mAs，另外120例患者采用自动ATPS。比较容积计算机断层扫描剂量指数（CTDIvol）、剂量长度乘积（DLP）、身体直径、噪声、信噪比和主观图像质量。
在ATPS组中，102例患者自动选择80 kV，15例患者选择100 kV，3例患者选择120 kV；无一例选择140 kV。ATPS组的CTDIvol中位数为4.81 mGy（2.2 - 10.6 mGy），DLP为568 mGy·cm（203 - 1324 mGy·cm），与固定120 kV组的CTDIvol 8.1 mGy（4.4 - 14.4 mGy）和DLP 1027.5 mGy·cm（509 - 1806 mGy·cm）相比显著降低（P < 0.01）。图像质量相当（P > 0.05）。
自动ATPS可显著降低下肢CTA的辐射剂量，同时图像质量保持在较高水平。
