Vardhanabhuti Varut, Olubaniyi Babajide, Loader Robert, Riordan Richard D, Williams Michael P, Roobottom Carl A
Department of Radiology, Derriford Hospital, Derriford Road, Plymouth, Devon, PL6 8DH, United Kingdom; Plymouth University Peninsula Schools of Medicine and Dentistry, Plymouth, Devon, PL4 8AA, United Kingdom.
Department of Radiology, Derriford Hospital, Derriford Road, Plymouth, Devon, PL6 8DH, United Kingdom.
J Med Imaging Radiat Sci. 2012 Dec;43(4):228-238. doi: 10.1016/j.jmir.2012.09.006. Epub 2012 Oct 24.
To compare image quality on computed tomographic (CT) images acquired with different levels of automatic tube current modulation reconstructed with filtered back projection (FBP), adaptive statistical iterative reconstruction (ASIR), and novel model-based iterative reconstruction (MBIR) techniques.
A torso phantom was scanned at 17 different noise levels of automatic current modulation and images were reconstructed with FBP, ASIR, and MBIR. Objective and subjective image qualities were assessed. Effective dose was also calculated.
Objective image analysis supports significant noise reduction and superior contrast to noise ratio with new a MBIR technique. Subjective image parameters were maximally rated for MBIR followed by ASIR then FBP. The reconstruction algorithms were evaluated over effective doses ranging from 0.7 to 3 mSv.
MBIR shows superior reduction in noise and improved image quality (both objective and subjective analysis) compared with ASIR and FBP. It was possible to achieve meaningful image quality even at the highest noise index of 70 achieving substantial dose reduction to as low as 0.7 mSv.
比较使用不同水平自动管电流调制获取的计算机断层扫描（CT）图像的图像质量，这些图像采用滤波反投影（FBP）、自适应统计迭代重建（ASIR）和新型基于模型的迭代重建（MBIR）技术进行重建。
使用自动电流调制的17种不同噪声水平对躯干模型进行扫描，并使用FBP、ASIR和MBIR重建图像。评估客观和主观图像质量。还计算了有效剂量。
客观图像分析表明，新型MBIR技术可显著降低噪声并提高对比度噪声比。主观图像参数对MBIR的评分最高，其次是ASIR，然后是FBP。在0.7至3 mSv的有效剂量范围内对重建算法进行了评估。
与ASIR和FBP相比，MBIR在降低噪声和改善图像质量（客观和主观分析）方面表现更优。即使在最高噪声指数为70的情况下，也有可能实现有意义的图像质量，同时将剂量大幅降低至低至0.7 mSv。
