Diffusion-weighted magnetic resonance imaging(DWMRI) is considered part of the standard imaging protocol for the evaluation of patients with prostate cancer.It has been proven valuable as a functional tool for qualita...Diffusion-weighted magnetic resonance imaging(DWMRI) is considered part of the standard imaging protocol for the evaluation of patients with prostate cancer.It has been proven valuable as a functional tool for qualitative and quantitative analysis of prostate cancer beyond anatomical MRI sequences such as T2-weighted imaging. This review discusses ongoing controversies in DW-MRI acquisition, including the optimal number of b-values to be used for prostate DWI, and summarizes the current literature on the use of advanced DWMRI techniques. These include intravoxel incoherent motion imaging, which better accounts for the nonmono-exponential behavior of the apparent diffusion coefficient as a function of b-value and the influence of perfusion at low b-values. Another technique is diffusion kurtosis imaging(DKI). Metrics from DKI reflect excess kurtosis of tissues, representing its deviation from Gaussian diffusion behavior. Preliminary results suggest that DKI findings may have more value than findings from conventional DW-MRI for the assessment of prostate cancer.展开更多
2018年日本腹部放射学年会、欧洲泌尿学会和欧洲泌尿影像学会共同发表了膀胱影像报告和数据系统(vesical imaging-reporting and data system,VI-RADS)。VI-RADS对膀胱MRI检查设备和技术要求提出了指导性建议,对检查要求、评估分类标准...2018年日本腹部放射学年会、欧洲泌尿学会和欧洲泌尿影像学会共同发表了膀胱影像报告和数据系统(vesical imaging-reporting and data system,VI-RADS)。VI-RADS对膀胱MRI检查设备和技术要求提出了指导性建议,对检查要求、评估分类标准、技术规范及扫描参数制定了规范。笔者将对VI-RADS的要点进行解读。展开更多
文摘Diffusion-weighted magnetic resonance imaging(DWMRI) is considered part of the standard imaging protocol for the evaluation of patients with prostate cancer.It has been proven valuable as a functional tool for qualitative and quantitative analysis of prostate cancer beyond anatomical MRI sequences such as T2-weighted imaging. This review discusses ongoing controversies in DW-MRI acquisition, including the optimal number of b-values to be used for prostate DWI, and summarizes the current literature on the use of advanced DWMRI techniques. These include intravoxel incoherent motion imaging, which better accounts for the nonmono-exponential behavior of the apparent diffusion coefficient as a function of b-value and the influence of perfusion at low b-values. Another technique is diffusion kurtosis imaging(DKI). Metrics from DKI reflect excess kurtosis of tissues, representing its deviation from Gaussian diffusion behavior. Preliminary results suggest that DKI findings may have more value than findings from conventional DW-MRI for the assessment of prostate cancer.
文摘2018年日本腹部放射学年会、欧洲泌尿学会和欧洲泌尿影像学会共同发表了膀胱影像报告和数据系统(vesical imaging-reporting and data system,VI-RADS)。VI-RADS对膀胱MRI检查设备和技术要求提出了指导性建议,对检查要求、评估分类标准、技术规范及扫描参数制定了规范。笔者将对VI-RADS的要点进行解读。
