The osteoarthritis initiative (OAI) magnetic resonance imaging quality assurance methods and results.

Osteoarthritis and Cartilage
E SchneiderR Gullapalli

Abstract

To outline the osteoarthritis initiative's (OAI) magnetic resonance (MR) system quality assurance (QA) processes and present the first 3 years' results. OAI MR QA included acquisitions evaluated manually at each of the four sites and other acquisitions assessed by an automated computer program. Key image characteristics such as signal-to-noise, contrast-to-noise, signal uniformity, T2 relaxation times, local and global geometric distortion were quantified monthly using the automated program. Uniformly high quality, artifact-free subject images were obtained from all four OAI 3 tesla MR facilities. Over a 3-year period, key criteria for quantitative cartilage morphometry were excellent with a 190.0 mm diameter and 148.0 mm length object having reproducible diameter (0.04% RMS CV) and length (0.56% RMS CV). This resulted in spherical volume reproducibility of 0.46% RMS CV. Ghost levels were consistently <0.2%. T2 relaxation time varied longitudinally site-by-site from 2.3 to 18.8% RMS CV. All other measures of MR system stability were met except: 3.0 mm and 5.0 mm slice thicknesses were consistently larger than expected; knee coil signal uniformity and signal level varied significantly over time. OAI MR QA results compared favora...Continue Reading

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Citations

Jul 31, 2010·EURASIP Journal on Bioinformatics & Systems Biology·Lior ShamirIlya G Goldberg
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May 18, 2021·Journal of the American Heart Association·David A Bluemke, Nadine Kawel-Boehm

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