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Characterizing radial undersampling artifacts for cardiac applications.

Dana C Peters·Pratik Rohatgi·René M Botnar·Susan B Yeon·Kraig V Kissinger·Warren J Manning
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Abstract

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 > or = 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 approximately 10% for short and long-axis imaging (R = 2.1) and approximately 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).

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ArtifactsHeartHumansImage EnhancementImage Processing, Computer-AssistedMagnetic Resonance ImagingPhantoms, ImagingJournal ArticleResearch Support, Non-U.S. Gov't

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BibTeXRIS

Dana C Peters, Pratik Rohatgi, René M Botnar, Susan B Yeon, Kraig V Kissinger, Warren J Manning. 2006. Characterizing radial undersampling artifacts for cardiac applications.. https://doi.org/10.1002/mrm.20782

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