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KMID : 0858520090130020137
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Journal of the Korean Society of Magnetic Resonance in Medicine
2009 Volume.13 No. 2 p.137 ~ p.145
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Effectiveness of 32-element Surface Coil Array for Accelerated Volume-Targeted Breath-Hold Coronary MRA
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Lee Hyun-Yeol
Suh Jin-Suck
Park Jae-Seok
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Abstract
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Purpose : To compare 12 and 32-element surface coil arrays for highly accelerated coronary magnetic resonance angiography (MRA) using parallel imaging.
Materials and Methods : Steady state free precession coronary MRA was performed in 5 healthy volunteers at 1.5 T whole body MR scanner using both 12 and 32-element surface coil arrays. Left anterior descending and right coronary artery data sets were acquired for each volunteer. Data sets were sub-sampled for parallel imaging using reduction factors from 1 to 6. Mean geometry factor (g-factor), maximum g-factor, and artifact level were calculated for each of the two coil arrays.
Results : Over all reduction factors, the mean and maximum g-factors and artifact level were significantly reduced using the 32-element array compared to the 12element array (P << 0.1). The mean g-factor was sensitive to the imaging orientations of coronary arteries while the maximum g-factor and artifact level were independent of orientation.
Conclusion : The 32-element surface coil array significantly improves artifact and noise suppression for highly accelerated coronary MRA using parallel imaging. The increased acceleration factors made feasible with the 32-element array offer the potential to enhance spatial resolution or increase volumetric coverage for 3D coronary MRA.
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KEYWORD
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Magnetic resonance imaging (MRI), Coronary magnetic resonance angiography, Parallel imaging, Geometry factor
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