UCO di Radiologia, Dipartimento di Scienze Mediche, Chirurgiche e della Salute, Azienda Ospedaliero-Universitaria di Trieste, Ospedale di Cattinara, strada di Fiume 447, Trieste, Italy,
Radiol Med. 2014 Apr;119(4):249-56. doi: 10.1007/s11547-013-0334-3. Epub 2013 Dec 12.
This study was undertaken to compare the different acquisition protocols available in a last-generation multislice computed tomography scanner used for cardiovascular studies, with particular attention to dosimetric aspects.
Our study compared prospective and retrospective electrocardiographic-gating techniques for cardiac imaging. For each patient, we performed in vivo dose measurements, using Gafchromic film. We compared the effective dose values estimated from the experimental measurements and the dose data reported on the CT console. Image quality was also assessed.
Prospective acquisition allows for major dose savings compared to retrospective acquisition (mean effective dose, 4.5 mSv with prospective acquisition versus 27.5 mSv with retrospective acquisition). The agreement between the experimental and software-based dose estimates was excellent and showed below 10% of variation of the measured dose.
In patients with regular rhythm and a heart rate lower than 75 bpm, the prospective acquisition technique ensures adequate diagnostic results and allows for significant patient dose savings.
本研究旨在比较用于心血管研究的最新一代多层 CT 扫描仪中可用的不同采集协议，并特别关注剂量学方面。
我们的研究比较了前瞻性和回顾性心电门控技术在心脏成像中的应用。对于每个患者，我们使用 Gafchromic 胶片进行体内剂量测量。我们比较了从实验测量得出的有效剂量值和 CT 控制台报告的剂量数据。还评估了图像质量。
与回顾性采集相比，前瞻性采集可显著降低剂量（前瞻性采集的平均有效剂量为 4.5 mSv，而回顾性采集为 27.5 mSv）。实验和基于软件的剂量估算之间的一致性非常好，表明测量剂量的变化低于 10%。
在心率低于 75 次/分且心律规则的患者中，前瞻性采集技术可确保获得足够的诊断结果，并显著降低患者的剂量。
