van Osch Jochen A C, Mouden Mohamed, van Dalen Jorn A, Timmer Jorik R, Reiffers Stoffer, Knollema Siert, Greuter Marcel J W, Ottervanger Jan Paul, Jager Piet L
Department of Medical Physics, Isala Hospital, Zwolle, The Netherlands,
Int J Cardiovasc Imaging. 2014 Jun;30(5):961-7. doi: 10.1007/s10554-014-0409-9. Epub 2014 Mar 28.
Iterative reconstruction techniques for coronary CT angiography have been introduced as an alternative for traditional filter back projection (FBP) to reduce image noise, allowing improved image quality and a potential for dose reduction. However, the impact of iterative reconstruction on the coronary artery calcium score is not fully known. In 112 consecutive stable patients with suspected coronary artery disease, the coronary calcium scores were assessed. Comparisons were made between the Agatston, volume and mass scores obtained with traditional FBP, and by using adaptive statistical iterative reconstruction (ASIR). A significant reduction of the Agatston score, volume score and mass score was observed for ASIR when compared to FBP, with median differences of resp. 26, 5 mm(3) and 1 mg. Using the ASIR reconstruction, the number of patients with a calcium score of zero increased by 13 %. Iterative CT reconstruction significantly reduces the Agatston, volume and mass scores. Since the calcium score is used as a prognostic tool for coronary artery disease, caution must be taken when using iterative reconstruction.
冠状动脉CT血管造影的迭代重建技术已被引入，作为传统滤波反投影（FBP）的替代方法，以减少图像噪声，从而提高图像质量并有可能降低辐射剂量。然而，迭代重建对冠状动脉钙化积分的影响尚不完全清楚。在112例连续的疑似冠心病稳定患者中，评估了冠状动脉钙化积分。比较了采用传统FBP以及自适应统计迭代重建（ASIR）获得的阿加斯顿积分、体积积分和质量积分。与FBP相比，ASIR时阿加斯顿积分、体积积分和质量积分显著降低，中位数差异分别为26、5 mm³和1 mg。采用ASIR重建时，钙化积分为零的患者数量增加了13%。迭代CT重建显著降低了阿加斯顿积分、体积积分和质量积分。由于钙化积分被用作冠心病的预后工具，因此在使用迭代重建时必须谨慎。
