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1.5T MR超高b值DWI对前列腺癌的诊断价值
引用本文:刘晓东,唐桑,周美红,翟荣存,方习奇,胡啸. 1.5T MR超高b值DWI对前列腺癌的诊断价值[J]. 实用放射学杂志, 2017, 0(8): 1290-1293. DOI: 10.3969/j.issn.1002-1671.2017.08.033
作者姓名:刘晓东  唐桑  周美红  翟荣存  方习奇  胡啸
作者单位:铜陵市立医院影像中心MRI室,安徽 铜陵,244000
摘    要:目的 探讨1.5T MR 超高b值扩散加权成像(DWI)对前列腺癌(PCa)的诊断价值.方法 收集分析行常规MRI和DWI(b值为400、800、1 400 s/mm2)扫描,并经临床病理证实的PCa 12例,前列腺增生(BPH)17例,分别测量各b值DWI上感兴趣区(ROI)的信号强度,对ROI的可视化程度进行分级,比较其间是否存在差异.结果 超高b值与高b值DWI PCa病灶的信号强度差异有统计学意义(χ2=220.957,P=0.000<0.05);b值越高,DWI上PCa癌灶亮度对比越高,可视化程度差异有统计学意义(χ2=11.378,P=0.003<0.05).超高b值DWI上PCa癌灶与BPH和正常外周带信号强度有统计学意义(χ2=25.913,P=0.000<0.05),超高b值DWI PCa病灶亮度主要是亮和灰亮(占71.4%),BPH和正常外周带的亮度以暗和灰暗为主(BPH组占63.0%,正常外周带组占73.3%);可视化程度差异都有统计学意义(Z=-6.908、-6.110,P值均为0.000<0.017).b=1 400 s/mm2的DWI信号强度和可视化程度诊断效能最高.结论 1.5T MR超高b值DWI能提高PCa癌灶的显示率,易于观察和诊断.

关 键 词:前列腺癌  扩散敏感因子值  扩散加权成像  磁共振成像

The value of ultra-high-b-value diffusion weighted imaging in thediagnosis of prostate cancer at 1.5T MR
LIU Xiaodong,TANG Sang,ZHOU Meihong,ZHAI Rongcun,FANG Xiqi,HU Xiao. The value of ultra-high-b-value diffusion weighted imaging in thediagnosis of prostate cancer at 1.5T MR[J]. Journal of Practical Radiology, 2017, 0(8): 1290-1293. DOI: 10.3969/j.issn.1002-1671.2017.08.033
Authors:LIU Xiaodong  TANG Sang  ZHOU Meihong  ZHAI Rongcun  FANG Xiqi  HU Xiao
Abstract:Objective To evaluate the ability of ultra-high-b-value diffusion weighted imaging (DWI) in diagnosis of the prostate cancer (PCa) at 1.5T MR.Methods 12 patients with PCa and 17 patients with benign prostate hyperplasia (BPH) proved by histopathology underwent MRI and DWI examinations (b=400, 800,1 400 s/mm2).The signal intensity and visual degree of region of interest (ROI) in all DWI with different b values were respectively measured.The signal intensity and visual degree of ROI between high-b-value DWI and ultra-high-b-value DWI were compared,respectively.Results The difference of signal intensity of PCa between high-b-value DWI and ultra-high-b-value DWI was statistically significant (χ2=220.957,P=0.000<0.05).The signal intensity of PCa was getting brighter in DWI with higher b value.The difference of visual degree between these two groups was also statistically significant (χ2=11.378,P=0.003<0.05).The difference among PCa, BPH and normal prostate peripheral zone was statistically significant in ultra-high-b-value DWI (χ2=25.913, P=0.000<0.05).The brightness of PCa in ultra-high-b-value DWI mainly was bright or grey-bright (71.4%), while the brightness of BPH and normal prostate peripheral zone were mainly dark or grey-dark (BPH 63.0%, normal prostate peripheral zone 73.3%).The difference of visual degree among PCa, BPH and normal prostate peripheral zone was statistically significant difference as well (Z=-6.908,-6.110,P=0.000<0.017).The diagnostic efficiency of the signal intensity and visual degree were highest with b=1 400 s/mm2.Conclusion DWI with ultra-high-b-value can improve the display rate of the PCa at 1.5T MR, making easier the detection and diagnosis of PCa.
Keywords:prostate cancer  b-value  diffusion weighted imaging  magnetic resonance imaging
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