Value of diffusion-weighted imaging with reversed polarity gradient multiplexed sensitivity-encoding in improving image quality of brain scanning
Objective To compare the brain image quality of diffusion-weight imaging(DWI)with reversed polarity gradient(RPG)multiplexed sensitivity-encoding(MUSE)and single-shot echo-planar imaging(SS-EPI).Methods From May to June in 2022,a total of 32 patients performed brain MRI were enrolled,which included 15 males and 17 females,aged 25-86 years old with median age of 57 years old.All of them performed cross-sectional T2 fluid attenuated inversion recovery(FLAIR),RPG-MUSE and SS-EPI.The DWI image of 2 groups were evaluated subjectively and objectively.The display of tissue structure(eyeball,optic nerve,temporal lobe,cerebellum and brainstem),magnetic sensitive artifacts,image geometric distortion and overall image quality were subjectively evaluated by 2 radiologists according to the 5-point scale.The objective evaluation in-dexes included signal-to-noise ratio(SNR)and Dice similarity coefficient(DSC)of DWI image in 2 groups.Results There were statistically significant differences in display of tissue structures(eyeball,optic nerve,temporal lobe,cerebellum,brainstem),suscep-tibility artifacts,image geometric distortion and overall image quality of DWI image between 2 groups(P＜0.05),subjective score of images in RPG-MUSE group was significantly higher than that in SS-EPI group[susceptibility artifacts:4.0 scores(4.0,4.0)vs 3.0 scores(2.0,3.0);image geometric distortion:4.0 scores(4.0,4.0)vs 3.0 scores(2.5,3.0);overall image quality:4.0 scores(4.0,4.0)vs 3.0 scores(2.0,3.0)].There were statistically significant differences in SNR and DSC of DWI image between 2 groups(P＜0.05),and the RPG-MUSE group was significantly higher than SS-EPI group[SNR:temporal lobe 247.05(151.55,412.37)vs 122.65(152.10,409.02);cerebellum 298.88(195.37,580.72)vs 173.25(140.97,206.73);brainstem 253.70(165.07,467.04)vs 141.09(107.01,166.80);DSC:0.94±0.15 vs 0.86±0.33].Conclusion It is demonstrated that RPG-MUSE could significantly improve susceptibility artifacts and geometric distortion of images,and improve the image quality of brain DWI.
magnetic resonance imagingdiffusion-weighted imagingmultiplexed sensitivity-encodingimage quality
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