MRI装置のQA Quality assuarance of diagnostic magnetic resonance imaging (MRI) system
Magnetic resonance imaging (MRI) is now widely used in clinical practices. However MR images may be affected by slight changes of machine performances or environmental conditions, and it could cause misdiagnosis in clinical routines. To maintain and assure image quality in clinical routines, performance of MRI system should be evaluated periodically. In this report we described the NEMA (National Electrical Manufactures Association) standard of evaluation methods of MRI system. The standard included determination of signal to noise ratio (SNR),2-dimensional geometric distortion, image uniformity and slice thickness. We also described the JIS (Japanese Industrial Standard) phantom, which was designed to measure the above characteristics as well as spatial resolution of MRI system in quality assurance (QA) programms.
放射線医学物理 17(1), 53-62, 1997-03
Japan Society of Medical Physics