Objective To observe the value of non-parallel transmission(non-PTX)reduced field-of-view(rFOV)echo planar imaging(EPI)sequence applied in diffusion weighted imaging(DWI)for displaying prostate lesions.Methods Conventional EPI-DWI and non-PTX rFOV-EPI-DWI were prospectively acquired in 30 patients with prostate lesions,including 22 cases of prostatic hyperplasia and 8 cases of prostate cancer.Subjective scoring of imaging quality,as well as objective evaluation on indexes including signal-to-noise ratio(SNR),contrast ratio(CR),contrast-to-noise ratio(CNR)and lesions'apparent diffusion coefficient(ADC)values were performed and compared between two kinds of DWI.Results The subjective score of non-PTX rFOV-EPI-DWI was higher than that of conventional EPI-DWI(P＜0.001).SNR,CR,CNR of non-PTX rFOV-EPI-DWI and lesions'ADC values measured on non-PTX rFOV-EPI-DWI were all higher than those of conventional EPI-DWI(all P＜0.05).Conclusion non-PTX rFOV-EPI DWI could display prostate lesions better than conventional EPI-DWI.

Objective To observe the value of non-parallel transmission(non-PTX)reduced field-of-view(rFOV)echo planar imaging(EPI)sequence applied in diffusion weighted imaging(DWI)for displaying prostate lesions.Methods Conventional EPI-DWI and non-PTX rFOV-EPI-DWI were prospectively acquired in 30 patients with prostate lesions,including 22 cases of prostatic hyperplasia and 8 cases of prostate cancer.Subjective scoring of imaging quality,as well as objective evaluation on indexes including signal-to-noise ratio(SNR),contrast ratio(CR),contrast-to-noise ratio(CNR)and lesions'apparent diffusion coefficient(ADC)values were performed and compared between two kinds of DWI.Results The subjective score of non-PTX rFOV-EPI-DWI was higher than that of conventional EPI-DWI(P＜0.001).SNR,CR,CNR of non-PTX rFOV-EPI-DWI and lesions'ADC values measured on non-PTX rFOV-EPI-DWI were all higher than those of conventional EPI-DWI(all P＜0.05).Conclusion non-PTX rFOV-EPI DWI could display prostate lesions better than conventional EPI-DWI.

According to the Rules for the Implementation of the Standards for Review of Level 3 General Hospital (2011) of Formor Ministry of Health,the paper analyzes the requirements of review of level 3 general hospital for decision support,and takes the Sixth Affiliated Hospital of Sun Yat-sen University as an example to introduce the decision support solution and the application of Decision Support System (DSS).

BACKGROUND:Disc functional magnetic resonance imaging studies are mostly carried out under lying and a non-load state, and do not reflect the changes in morphology and function of the upright human body under disc load conditions. Therefore, we need to study characteristics of disc functional magnetic resonance imaging in the upright state. OBJECTIVE: To analyze the effect of axial load on apparent diffusion coefficient and T2 of intervertebral discs. METHODS:The study consisted of 17 patients with low back pain aged 34-65 years. Before and after axial load, T2 weighted MR imaging, T1 weighted MR imaging, diffusion tensor imaging, and T2-mapping imaging of the lumbar spine were performed. Load quality was 40%-50% body weight. At 10 minutes after axial load, another diffusion tensor imaging was performed. After 15-minute load, another T2-mapping sequence was scanned. Diffusion tensor imaging scan parameters: single echo-planar imaging, repetition time 2 500 ms, echo time 89 ms, six diffusion directions, b value of 400 s/mm2, sweep time 4:10 minutes. Raw data of diffusion tensor imaging were used to construct apparent diffusion coefficient map and b0 map. Apparent diffusion coefficient value of intervertebral discs was calculated before and after loading. T2 map was automaticaly constructed using T2-mapping sequence to measure apparent diffusion coefficient and T2 values in the whole intervertebral disc of nucleus pulposus, and the changes of them were analyzed under short-time axial load. RESULTS AND CONCLUSION:Pfirrmann grading results in 17 patients with 85 discs were obtained as folows: 0 in Grade I, 26 in Grade II, 19 in Grade III, 30 in Grade IV, and 10 in Grade V. Al 85 disc T2 relaxation time mapping and 84 disc apparent diffusion coefficient mapping were accepted. Under short-time axial load in 84 discs, apparent diffusion coefficient reduced in the whole disc (reduced 38×10-3 mm2/s,Z=2.567,P < 0.05) and nucleus pulposus (reduced 62×10-3mm2/s,Z=3.461,P < 0.05). Apparent diffusion coefficient changes mainly affected Grade Pfirrmann III discs (reduced 55×10-3mm2/s,Z=2.556,P < 0.05). T2 changes mainly affected normal intervertebral discs (Pfirrmann grade II). Under the load, T2 value of intervertebral discs diminished (reduced 3.17 ms,Z=2.967,P < 0.05). No significant difference in apparent diffusion coefficient and T2 value was detected under the load in other grades of the intervertebral discs (P > 0.05). These results suggest that changes in apparent diffusion coefficient and T2 values were different due to different Pfirrmann grades under short-time axial load. To evaluate magnetic resonance imaging function of intervertebral discs, we should choose different evaluation method according to different degeneration degrees.