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| The application of customized rice bags during neck 3.0T MRI scanning with diffusion weighted imaging |
| WANG Rong, ZHU Da-rong, HAN Zhi-jiang, DING Jin-wang |
| Department of Radiology, Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine, Hangzhou 310006, China |
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Abstract Objective: To investigate the value of using customized rice bags during the neck 3.0T MRI scanning with diffusion weighted imaging(DWI) pulse sequences. Methods: Fifty healthy volunteers were scanned with the DWI sequences using the same parameter settings, one group with customized rice bags placed on the neck and upper chest and the other group without. The resultant images were compared using a four-level observer-grading system(Levels 1～4 for image effect from the worst to the best) for subjective evaluation as well as via quantitative measurements of deformation rate in different regions of interest for objective evaluation. Statistical significance for the comparison between the conventional(no rice bag) group and the rice-bag group or between the observers was analysed by the Mann-Whitney test and the Wilcoxon test, or the Kappa test. Results: Using the four-level observer-grading system for the DWI, the 50 cases were classified as followed in the conventional group vs. the rice-bag group: 30 vs. 0(Level 1), 15 vs. 0 (Level 2), 5 vs. 4 (Level 3), and 0 vs. 46 (Level 4), with P<0.05 for all levels. For the quantitative comparison, the deformation rate for the conventional group vs. the rice-bag group in the average deformation rate of phase encoding direction when the b=200, 400, 600 and 800 s/mm2 were 80.51±25.31 and 11.41±4.31, 81.92±23.27 and 12.23±5.25, 82.89±19.63 and 12.52±9.67, 83.41±30.44 and 13.22±11.32. Conclusion: In neck 3.0T MR DWI scans, the use of customized rice bags can significantly improve the imaging quality and reduce the deformation rate. It is simple to implement and hence broadly applicable.
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Received: 13 May 2019
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2020, Vol. 31 
