MR不同弥散加权序列前列腺图像质量评价研究

目的比较MR常规DWI、ZOOMit DWI和RESOLVE DWI三种不同弥散成像序列的前列腺图像质量,以选择最优化的前列腺MR弥散成像扫描方案。材料与方法回顾性收集2020年4月至10月前列腺MRI检查的60例患者,均行常规DWI、ZOOMit DWI和RESOLVE DWI三种不同弥散成像序列扫描。由2名经验丰富的放射科诊断医师根据Likert评分分别对三种不同弥散加权图像的清晰度、图像失真和伪影进行主观评分。另由2名经验丰富的放射科技术人员分别手动勾画60例患者的前列腺轮廓,并计算出该区域信噪比(signal-to-noise ratio,SNR)、对比噪声比(contrast-to-noise ratio,CNR)。比较分析三种不同弥散成像序列的主观评分和客观指标的差异。结果三种不同弥散成像序列图像清晰度、失真和伪影的主观评分之间的差异具有统计学意义(P<0.05)。ZOOMit DWI序列的清晰度最好,失真最小,伪影最少。三种不同弥散成像序列的SNR(b=50)、SNR(b=1400)值的差异具有统计学意义(P<0.05);三种不同弥散加权序列的CNR(b=50)值的差异没有统计学意义(P>0.05);前列腺左右径、前后径/左右径比值的差异具有统计学意义(P<0.05)。结论ZOOMit DWI序列具有较好的图像质量,可以作为前列腺MRI弥散成像的首选序列。

Image quality assessment on MR images of the prostate acquired in different diffusion weighted sequences

Objective:We aimed to compare the image quality among conventional diffusion-weighted imaging(DWI),ZOOMit DWI,and RESOLVE DWI sequences for prostate imaging and to optimize the strategy to obtain high-quality diffusion MRI.Materials and Methods:We retrospectively collected patients scanned with conventional DWI,ZOOMit DWI,and RESOLVE DWI imaging on the same scanner from April to october 2020,sixty patients were enrolled.The clarity,distortion,and artifacts of the images acquired in the three sequences were subjectively evaluated by two experience d radiologists.The outline of the prostate was manually delineated from the images by two experienced radiologists,and the SNR and CNR of the images were calculated.Differences in the subjective scores and objective parameters among the three sequences were compared.Results:The subjective scores of clarity,distortion,and artifacts have significantly difference among the three sequences(P<0.05).ZOOMit DWI had the highest clarity and the lowest distortion and artifacts.The the SNR(b=50)and SNR(b=1400)have significantly difference among the three DWI techniques(P<0.05).The CNR(b=50)of the three DWI sequences have no difference(P>0.05).The right-left diameter and the ratio of the anterior-posterior diameter/right-left diameter have significantly difference among the three DWI techniques(P<0.05).Conclusions:ZOOMit DWI sequence images were of higher quality.Therefore,ZOOMit DWI for prostate MRI is preferable for a better diagnosis.