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《Academic Journal of Second Military Medical University》 2012-01
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Magnetic resonance spectroscopic imaging with only surface coils for diagnosing prostate cancer

JIANG Fang-fang1,WANG Jian1,WU Cheng2,ZHANG Jing3,YANG Qing4,LU Jian-ping1 1.Department of Radiology,Changhai Hospital,Second Military Medical University,Shanghai 200433,China 2.Department of Health Statistics,Faculty of Health Service,Second Military Medical University,Shanghai 200433,China 3.Department of Radiology,People's Hospital of Jiangsu Province,Nanjing 210029,Jiangsu,China 4.Department of Urology,Changhai Hospital,Second Military Medical University,Shanghai 200433,China  
Objective To study the value of magnetic resonance spectroscopic imaging(MRSI) with only surface coils in diagnosing prostate cancer.Methods A total of 48 elderly patients with surgery or biopsy-confirmed benign prostatic hyperplasia or prostate cancer were preoperatively examined by surface coils for three-dimensional simple multi-voxel magnetic resonance spectroscopy scans,and the voxel (choline+creatine)/citrate(Cit) values were calculated.According to the pathological findings,the voxels were divided into prostate cancer and non-cancer.The voxel(Cho+Cr)/Cit values of prostate central zone and prostate peripheral zone were analyzed.The voxel nature of(Cho+Cr)/Cit value was used as the gold standard receiver to plot characteristic curve(ROC curve) and to calculate the area under the curve;the maximal Youden index was used as the standard to obtain the cut-off value and the corresponding sensitivity and specificity.Results The voxel(Cho+Cr)/Cit values of different natures were significantly different(P0.001).When the area under the ROC curve of(Cho+Cr)/Cit value was used for diagnosis of prostate cancer,the central zone was 0.652,and the peripheral zone was 0.821.For the cut-off value,the central zone was(Cho+Cr)/Cit=0.645,with the corresponding sensitivity and specificity being 0.512 and 0.71,respectively;the peripheral zone was(Cho+Cr)/Cit=0.815,with the corresponding sensitivity and specificity being 0.72 and 0.84,respectively.Conclusion Surface coil alone can successfully complete the three-dimensional proton spectroscopic imaging of prostate,and(Cho+Cr)/Cit=0.815 for the cut-off value has a high diagnostic value for peripheral zone prostate cancer.
【CateGory Index】: R737.25
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