To compare the effects of 12-channel hard and soft coils on the imaging quality of shoulder MRI. Methods: Thirty-three healthy volunteers underwent MRI scanning with a hard coil and soft coil. A comparison of SNR and contrast noise ratio (CNR) of the supraspinatus muscle (deltoid muscle), humeral head and biceps long head tendon in PDWI-FSE-COR-FS, T1WI-FSE-COR, PDWI-FSE-TRA-FS and T2WI-FSE-SAG-FS sequences was made. T1WI-FSE sequence scanning was performed on the special water module of the joint image using a shoulder hard coil and soft coil. The SNR of each layer was collected, and a pairwise t test was performed after normal distribution analysis. Results: In terms of objective evaluation, the SNR obtained by the soft coil was better than that obtained by the hard coil in the supraspinatus PDWI-FSE-COR-FS and T1WI-FSE-COR sequence, humeral head PDWI-FSE-TRA-FS and T2WI-FSE-SAG-FS sequence, and the differences were statistically significant (all P < 0.05). The CNR of the images obtained by the soft coil in the suprapinatus PDWI-FSE-COR-FS sequence was better than that obtained by the hard coil, the difference was statistically significant (P < 0.05). And there were no significant differences in other sequence parameters (all P > 0.05). Comparison of SNR between hard coil and soft coil in water model test showed no statistical significance (P > 0.05). In terms of subjective evaluation, the difference in SNR of each sequence was statistically significant (P < 0.05).
Conclusions: In the shoulder joint MRI examination, the imaging quality of the soft coil is higher than that of the hard coil, which has clinical application and popularization value.
Key wordsShoulder joint    Flexible coil    Hard coil    Imaging quality    Magnetic resonance imaging