Characterizing radial undersampling artifacts for cardiac applications
Characterizing radial undersampling artifacts for cardiac applications
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DOI：
10.1002/mrm.20782
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发表时间：
2006-02-01
影响因子：
3.3
通讯作者：
Manning, WJ
中科院分区：
文献类型：
--
作者：
Peters, DC;Rohatgi, P;Manning, WJ
The undersampled radial acquisition has been widely employed for accelerated (by a factor R = N-r/N-p) cardiac imaging, but the resulting reduction in image quality has not been well characterized. This investigation presents a method of measuring these artifacts through synthetic undersampling of high SNR images (SNR 30). After validating the method in phantoms, the method was applied to a study of short-axis, long-axis, and coronary MRI imaging in healthy subjects. For 60 projections (60 N-p), the total artifact is similar to 10% for short and long-axis imaging (R = 2.1) and similar to 15% for coronary MRI (R = 3.7). For 60 N-p, the SD of artifact in the region of the heart is 2% for short- and long-axis imaging (R = 2.1) and 3.5% for coronary MRI (R = 3.7). The artifact content is less in the region of the heart than in the periphery. The artifact is very reproducible among subjects for standard views. A study of coronary MRI at progressively fewer projections (at constant scan time) showed that right coronary MRI images were acceptable if total artifact was < 6.5% of image content (N-p > 120, R = 2.1).
