Characterizing radial undersampling artifacts for cardiac applications

TY - JOUR

T1 - Characterizing radial undersampling artifacts for cardiac applications

AU - Peters, D C

AU - Rohatgi, P

AU - Botnar, R M

AU - Yeon, S B

AU - Kissinger, K V

AU - Manning, W J

PY - 2006/2

Y1 - 2006/2

N2 - 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)

AB - 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)

U2 - 10.1002/mrm.20782

DO - 10.1002/mrm.20782

M3 - Article

SN - 1522-2594

VL - 55

SP - 396

EP - 403

JO - Magnetic Resonance in Medicine

JF - Magnetic Resonance in Medicine

IS - 2

ER -