RESUMO
ObjectiveTo investigate the value of reduced field-of-view DWI （r-FOV DWI） in quantitative assessment of axial spondyloarthritis. MethodsA total of 112 patients with chronic back pain or suspected axial spondyloarthritis receiving full field-of-view DWI （f-FOV DWI） and reduced field-of-view DWI （r-FOV DWI） from December 2019 to December 2021 were enrolled. Next， subjective image quality assessment （anatomical detail， artifacts， distortion， overall image quality） and objective image quality assessment including （signal to noise ratio and contrast to noise ratio） were conducted by two experienced radiologists. In addition， the Apparent Diffusion Coefficient （ADC） values of three groups （active group， inactive group， and control group） on the two DWI sequences were measured by the two radiologists， respectively. Finally， the consistency of measurement between the two researchers was evaluated and the differences in ADC values was compared. Results102 patients were included and were divided into three groups， including the active group （n=32）， inactive group （n=29）， and control group （n=41） according to ASAS diagnostic criteria. All subjective and objective image quality metrics were rated in favor of r-FOV DWI images compared with f-FOV DWI images ［overall image quality： DWI 4（3~4） vs. 3（3~3） and SNR： 6.58（5.05~10.38） vs. 4.46（2.37~10.04）， CNR： 2.04（-1.14~8.29） vs. 0.97（-8.19~7.12）；P＜0.05］. Inter-rater consistency of the two researchers were 0.60~0.74. According to the AUC curve， group inactive vs. control showed r-FOV DWI was better than f-FOV DWI. In other groups （lesion vs. control， active vs. inactive）， there were no differences between both sequences（P＜0.05）. ConclusionThe subjective image quality score and signal to noise ratio of r-FOV DWI were higher than those of f-FOV DWI， which could be used for quantitative assessment of axial spondyloarthritis.
RESUMO
Objective:To measure the parameters of median nerve under ultrasound in patients with diabetes mellitus to explore the relationship between ultrasonic parameters and nerve conduction study. Methods:From June to November, 2019, 79 diabetic patients were divided into diabetic peripheral neuropathy (DPN) group (n = 37) and non-DPN group (n = 42) according to the diagnosis. Their right median nerve were measured cross-sectional area (CSA) and the proportion of hypoechoic areas (HA) 5 cm and 10 cm proximal to the wrist (CSA-5, CSA-10, HA-5 and HA-10, respectively) with sonography; while the conductive latency and velocity of right median nerves were measured with nerve conductive study. Results:CSA-5, CSA-10 and HA-10 were more in DPN group than in non-DPN group (|Z| > 2.282, P < 0.05). HA-5 correlated with the motor conductive latency (r = 0.264, P < 0.05) and velocity (r = -0.270, P < 0.05); HA-10 correlated with the abnormal sensory conductive latency (r = 0.234, P < 0.05) and velocity (r = 0.363, P < 0.01), and the motor conductive latency (r = 0.235, P < 0.05) and velocity (r = -0.255, P < 0.05). Conclusion:DPN can be found under sonography, some of them are related with the nerve electrophysiology, which may be a useful tool to screen DPN.
RESUMO
Objective:To investigate the reliability of the morphological measure of medial gastrocnemius by musculoskeletal ultrasound imaging on the standing and prone positions, and compare the differences in the structural parameters of the medial gastrocnemius in different positions. Methods:From December, 2017 to May, 2018, 30 healthy young subjects were measured the muscle thickness, fascicle length and pennation angle of medial gastrocnemius on the prone and standing position respectively by two testers with musculoskeletal ultrasound. One of the testers re-tested three days later. The intra-class correlation coefficient (ICC), measurement standard error (SEM) and minimum detectable change (MDC) of all muscle morphological parameters in different positions were calculated respectively, and the differences of the morphological measurement of the medial gastrocnemius between these two positions were compared. Results:In the prone position, the ICC of inter-rater was 0.932 to 0.943 and the ICC of intra-rater was 0.880 to 0.915. In the standing position, the ICC of inter-rater was 0.922 to 0.938, and the ICC of intra-rater was 0.839 to 0.925. There were significant differences in muscle thickness, fascicle length and pennation angle of medial gastrocnemius in standing position and prone position (P < 0.01). Inter-rater SEM of muscle thickness and fascicle length was less in standing position than in prone position, while intra-rater MDC of pennation angle was less in prone position. Conclusion:It is reliable to measure medial gastrocnemius in standing and prone positions with ultrasonography. Morphological measurement of gastrocnemius is more accurate in standing position, while the measurement in prone position is more sensitive.