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25 May 1989 Sensitivity Correction In Surface Coil MR Imaging
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Abstract
A sensitivity correction for a single turn receiver coil used to image a human knee is discussed. The coil consists of single band of copper conductor circling a plastic leg form and the patient's knee. While the excitation can be considered reasonably uniform across the field of view, the detection of the decaying MR signal by the single-turn solenoidal reciever coil is very non-uniform, falling off rapidly away from the copper conductor. We have modeled the sensitivity function of this coil as equivalent to that of a single-turn circular antenna with a known radius. A correction for this sensitivity variation may be approximated numerically and applied to the image in a post-processing manner. By a combination of qualitative and quantitative measures, the efficacy of this 'current-loop' correction scheme is measured by evaluating the uniformity of NiCl2 phantom images. A technique for applying this correction to clinical images of the knee is also discussed.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
P. Duffy Cutler and Nicholas J. Mankovich "Sensitivity Correction In Surface Coil MR Imaging", Proc. SPIE 1092, Medical Imaging III: Image Processing, (25 May 1989); https://doi.org/10.1117/12.953292
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