Journal of Ningxia Medical University. Diffusion Weighted Imaging DWI b 500 s / mm s / mm 2

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1 786 Journal of Ningxia Medical University MRI MR Diffusion Weighted Imaging DWI DWI2 b 500 s / mm s / mm 2 Apparent Diffusion Coefficient ADC ± mm 2 /s ± mm 2 /s ± mm 2 /s ± mm 2 /s ± mm 2 /s ± mm 2 /s 2 b b = ADC P < ± mm 2 /s ± mm 2 /s - 2 b ADC P < b ADC P < % DWI 1MR b ADC ADC 2 DWI DWI R A 36 ~ MR GE SIGNA HDX 1. 5T Diffusion Weighted Imaging 8 DWI DWI Echo - planar imaging EPI DWI DWI GRAPPA 2 Apparent Dif- b s /mm 2 Functool ADC FOV NZ09124 DWI b 500 s/mm 2 TR/ TE 4150ms/57. 9ms FOV320mm fusion Coefficient ADC 1 1 TDLU TDLU 1. 1 DCIS MRI TDLU 2 DCIS DCIS 8 8 ADH % TDLU mm 250Hz 5. 0mm b 1000 s /

2 8. MRI 787 mm 2 TR /TE 5000ms /67. 5ms b FOV 320mm 320mm 250Hz 5. 0mm 1 ADC P = GE ADW4. 4 Functool 1 27 b ADC ADC ± 10-3 mm 2 /s n Region of Interest ROI b = 500s /mm 2 b = 1000s /mm 2 DCIS ± ± ADH ± ± ROI TDLU ± ± ± ± ROI DCIS ADC P < ADH P < TDLU P < ROI 3 3 ROI ADC WHO ROI 3 ROI ADC DWI - ADC 5 SNK - q SPSS DWI ADC ADC = In SI /SI / b - b 1 ~ 3 4 b ADC b = DWI % 500s /mm 2 b = 1000 s /mm 2 ADC 13 /38 DWI ADC % 5 / % ADC ADC b 5 / % 3 /18 - b ADC 1a 1b 2a 8 2b 3a 3b 4 - ADC 2. 2 b ADC 9 10 b ADC - ADC - 2 b b = ADC ADC P < b ADC P < DWI DWI 2 b ADC P < DWI ADC

3 Celis JE Moreira JM Gromova I et al. Characterization of breast precancerous lesions and myoepithelial hy- ADC perplasia in sclerosing adenosis with apocrine metaplasia J. Mol Oncol ADC 3. J Tavassoli FA Devilee P. WHO Pathology and Genetics Tumours of the Breast and Female Genital Organ M. Lyon IARC Press DWI 5 Le Bihan D. Diffusion perfusion and functional magnetic resonance imaging J. J Mal Vasc DWI DWI Sinha S Lucas Quesada FA Sinha U et al. In vivo diffusion - weighted MRI of the breast potential for lesion ADC characterization J. J Magn Reson Imaging MR - J Nonomura Y Yasumoto M Yoshimura R et al. Relationship between bone marrow cellularity and apparent diffu- DWI sion coefficient J. J Magn Reson Imaging J M J 10. MR Application of Diffusion Weighted Imaging in the Diagnosis of the Intraductal Hyperplasia Lesions of Breast LIU Yun 1 WANG Xing - juan 2 REN Xiao - lu 2 WANG Xue - mei 2 MA Feng 2 ZHANG Xiao - yu 1 1. Department of Radiology the General Hospital of Ningxia Medical University Yinchuan Ningxia Medical University Yinchuan Abstract Objective To investigate the application value of diffusion weighted imaging of MRI in the diagnosis of the intraductal hyperplasia Lesions of Breast. Methods 27 patients with 38 lesions proved by histological results were included. All cases underwent the diffusion weighted imaging. Two different b values s /mm 2 and the ADC values of lesions were measured. Results With b values of 500 s /mm 2 and 1000 s /mm 2 the average ADC values of DCTS ± mm 2 /s ± mm 2 / s ADH ± mm 2 /s ± mm 2 /s TDLU hyperplasia ± mm 2 /s ± mm 2 /s normal breast tissue ± mm 2 /s ± mm 2 /s. DCIS and TDLU hyperplasia in two different b values s / mm 2 had significantly statistical difference P < DCIS and normal breast tissue in two different b values s /mm 2 was statistical difference P < ADH and TDLU hyperplasia in two different b

4 8. MRI 789 values s /mm 2 had significantly statistical difference P < ADH and normal breast tissue in two different b values s /mm 2 showed significantly statistical difference P < TDLU hyperplasia and normal breast tissue in two different b values s /mm 2 had significantly statistical difference P < About % lesions of the intraductal hyperplasia Lesions of Breast showed high signal or a little high signal in DWI. Conclusion In diffusion weighted imaging of MRI the larger b value is the smaller lesions' ADC value tend to The smaller lesions' ADC value is the more malignant lesions tend to About % lesions of the intraductal hyperplasia Lesions of breast show high signal or a little high signal in DWI. Therefore currently we suggest that if we only rely on DWI it is difficult to diagnose the intraductal hyperplasia Lesions of Breast. Key words breast intraductal hyperplasia magnetic resonance imaging diffusion weighted imaging 785 A Clinical Comparative Study of Percutaneous Cannulated Screw Versus Plate Fixation for Posterior Ankle Fractures LEI Lei 1 YANG Tie - yi 2 WANG Zhi 2 ZHENG Shi - wei 2 LIU Shu - yi 2 LIU Yue 2 1. Ningxia Medical University Yinchuan Orthopeadic Department of Gongli Hospital Shanghai Abstract Objective To compare the functional and radiographic outcomes of percutaneous cannulated screw and plate fixation in treatment of patients with posterior ankle fractures. Methods From January 2006 to March patients with posterior ankle fractures were treated with percutaneous cannulated screw or plate fixation. Their functional and radiographic outcomes were reviewed to compare the differences in bone u- nion time full weight - bearing time American orthopaedic foot and ankle society AOFAS scores and complications. Results 84 cases had complete follow - up records and a mean follow - up of months range 12 to 23 months. 11 complications occurred in the cannulated screw fixation group. The mean full weight - bearing time and radiographic bone union time were and 9. 1 weeks respectively in the cannulated screw fixation group which had a mean AOFAS score of points. Six complications were found in the plating group. The mean full weight - bearing time and radiographic bone union time were and 8. 8 weeks respectively in the plating group which had a mean AOFAS score of points. There were no significant differences between the two groups except AOFAS score aspect. Conclusion For big side or comminuted posterior ankle fractures the plate fixation is a good choice for patient of a necessary condition of ankle joint early functional exercise. Key words posterior ankle fracture plate internal fixation cannulated screw internal fixation joint function

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