Evaluation of Signal Detectability in Magnetic Resonance Imaging by ROC Analysis

概要

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We evaluated signal detectability in magnetic resonance(MR) images by using receiver operating characteristic (ROC) analysis with the continuously - distributed scale method. MR imaging sysytem adopted was RESONA(GE - YMS), which has the operating field of 0.5T. The phantom of MR images was NiCl<SUB>2</SUB> solution varying by 0.25m mol/l in concentration, which allowed longitudinal relaxation time (T1) to change. We employed T1- weighted image of spin - echo pulse sequence for MR imaging. We performed ROC analysis by using signal intensity data from MR images. As a result, in regard to the variation of thickness, the thicker the slice was, the more improvement in signal detectability. On the variation of time of repeat (TR), signal detectability increased with the length of TR, but its variation was less than that produced by slice thickness. It was considered that there was a limitation in improvement in signal detectability by extension of TR. It was concluded that ROC analysis made possible evaluation of signal detectability in consideration of effect of signal - to - noise (SNR) for MR images and difference in Ti. We think that this method is useful in the evaluation of performance, the check of equipment, and the determination of the best image sequence.
Medical Imaging and Information Sciencesの論文