Journal
MAGNETIC RESONANCE IMAGING
Volume 22, Issue 1, Pages 93-101Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.mri.2003.04.001
Keywords
quality assurance; uniformity; signal-to-noise ratio
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Many international protocols related to RMI-QC program are focused on acquisition methods and analysis of several image quality parameters but rarely normality ranges or measurement frequencies are presented. To address this problem we investigated the variability of many magnetic resonance imaging (MRI) systems with the set-up of multicenter trial. The trial was set up to investigate short-and mid-term variability of two fundamental nongeometric image quality parameters: signal-to-noise (SNR) and integral percent uniformity (U%). Ten centers (12 devices) participated to data collection consisting of a three-step-protocol. First, 10 consecutive images of a phantom were collected with a spin echo sequence. As second step the series collection was repeated 24 h later. Finally a single image acquisition was performed twice a week for 5 weeks. The analysis of results allowed us to define a physiological variability of +/-3% of the reference level for both parameters and to conclude that a weekly measurement is adequate to detect relevant variations of device performance. (C) 2004 Elsevier Inc. All rights reserved.
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