Analysis of low field permanent magnet type MR image quality control

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• Experience Exchange •

SONG Hong-bin CHEN Yong CHEN Jin-chao

DOI:10.12015/issn.1674-8034.2016.09.011.

Abstract

[Abstract] Objective: By aid of clinical application of the low field equipment, we found some common causes of affecting image quality. The causes were analyzed to achieve the image quality control, so as to provide more valuable diagnostic basis for the clinic.Materials and Methods: Total 400 MRI cases were analyzed and evaluated for image quality, and the main observation indicators were spatial resolution (SR), signal to noise ratio (SNR), image contrast and contrast to noise ratio (CNR), equipment plait artifacts, chemical shift artifacts, truncated artifacts, magnetic susceptibility artifact, motion artifacts, and metallic artifacts. According to these indicators, the images were classified into three classes: excellent, good, and poor.Results: In 400 cases, the image quality was excellent in 280 cases, good in 100 cases and poor in 20 cases. The reasons for the 20 poor images were three: (1) Poor patient coordination. (2) Improper handling of artifacts in magnetic resonance imaging (MRI) and magnetic resonance parameters control. (3) Machine stoppage.Conclusions: Low field permanent magnet type MRI to get a good image, we must attach importance to improving image quality.

[Keywords] Magnetic resonance imaging；Quality control