1 May 1990 Analysis of random noise, coil inhomogeneity, and ghost artifacts in spin echo imaging on a 1.5 T commercial magnetic resonance imager
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Abstract
Noise in spin echo (SE) images in MRI consists of random and structured components Structured noise arises mainly from the non-uniformity of the B1 field. We have studied these errors using a cylindrical phantom. Random noise analysis by subtraction of a 4,9, or 25 points smoothed image from the original image showed small but significant differences between the three methods, though it was uniform over the phantom and changed little with time over a span of 8 months. The rf coil nonuniformity ( coefficient of variation,CV) in two areas of interest (ROI). a central area (40 cm2) and a ring outside the central region (130 cm2) was measured to be 21% and 45% respectively for the saddle coil and 1 5% and 6.0% respectively for the bird cage coil Using the first day flood image for correction of the later images. CV in the two ROI's of the corrected images were 1.3% and 2.2% for the saddle coil respectively and 0.9% and 1.6% respectively.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ramesh Chandra, Ramesh Chandra, Henry Rusinek, Henry Rusinek, } "Analysis of random noise, coil inhomogeneity, and ghost artifacts in spin echo imaging on a 1.5 T commercial magnetic resonance imager", Proc. SPIE 1245, Biomedical Image Processing, (1 May 1990); doi: 10.1117/12.19547; https://doi.org/10.1117/12.19547
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