Analysis of random noise, coil inhomogeneity, and ghost artifacts in spin echo imaging on a 1.5 T commercial magnetic resonance imager

Ramesh Chandra; Henry Rusinek

doi:10.1117/12.19547

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

Ramesh Chandra, Henry Rusinek

Author Affiliations +

Proceedings Volume 1245, Biomedical Image Processing; (1990) https://doi.org/10.1117/12.19547
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

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.

Citation Download Citation

Ramesh Chandra and 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); https://doi.org/10.1117/12.19547

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available