The detection of quality control for image quality of 3.0T MRI / 中国医学装备

ABSTRACT

Objective: To investigate the situation of quality control of 3.0T magnetic resonance imaging (MRI) system. Methods: A series of indicators, including signal noise ratio(SNR), image uniformity, resolution of long-scale contrast, resolution of space, linearity and quality control of slice thickness, of 3.0T MRI system were measured by using Magphan SMR170 phantom (made by the phantom laboratory in American) on the Discovery MR 750 w system which made by GE company of American. And a series of formula, including SNR=(Sinside-Soutside)÷SDinside, U∑=(1-Smax-Smin/Smax+Smin ×100%, linearity=LR-LM/LR×100%、thickness=half of height and width ×0.25, were used to calculate SNR, image uniformity, linearity and quality control of slice thickness, and all of these results were used to evaluate the situation of quality control of 3.0T MRI system. Results:The results revealed that SNR of 3.0T MRI was 105, the imaging uniformity achieved to 99.13%, the resolution of long-scale contrast was 5mm/0.5mm, the resolution of space was 6 LP/cm, linearity achieved to 0.89% and the deviation of slice thickness was 0.6mm. All of these indicators has achieved the standards of detection. Conclusion: Through detecting the SNR, imaging uniformity, resolution, linearity and the deviation of slice thickness of 3.0T MRI system, the performance of the MRI can be accurately obtained, and these contribute to ensure the equipment operating in ideal situation.