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, 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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