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首页> 外文期刊>Journal of magnetic resonance imaging: JMRI >Comparison of reduced field‐of‐view diffusion‐weighted imaging (DWI) and conventional DWI techniques in the assessment of rectal carcinoma at 3.0T: Image quality and histological T staging
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Comparison of reduced field‐of‐view diffusion‐weighted imaging (DWI) and conventional DWI techniques in the assessment of rectal carcinoma at 3.0T: Image quality and histological T staging

机译：在3.0T的直肠癌评估中降低视场扩散加权成像（DWI）和常规DWI技术的比较：图像质量和组织学T分期

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Purpose To compare image quality (IQ) of reduced field‐of‐view (rFOV) and full FOV (fFOV) diffusion‐weighted imaging (DWI) sequences at 3T, with histological T staging of rectal cancer as a reference standard. Materials and Methods In all, 81 patients with rectal cancer received magnetic resonance (MR) scans (3.0T), including both rFOV and fFOV DWI sequences. The signal‐to‐noise ratio (SNR) and contrast‐to‐noise ratio (CNR) were quantitatively evaluated using the paired t ‐test. Two radiologists independently assessed subjective IQ parameters, including image sharpness, distortion, artifacts, lesion conspicuity, and overall subjective IQ of both sequences. The Wilcoxon signed rank test was used to compare subjective IQ scores and tumor apparent diffusion coefficients (ADCs) between DWI sequences. Spearman correlation analysis was used to correlate ADC values and corresponding T staging of rectal cancer. Results CNR was significantly higher in rFOV DWI than in fFOV DWI (7.15 ± 2.77 vs. 5.39 ± 2.08, P 0.001). SNR was significantly higher in rFOV DWI than in fFOV DWI (44.17 ± 11.01 vs. 34.76 ± 13.30, P 0.001). The subjective IQ parameters of rFOV DWI sequence were rated superior to those of fFOV DWI sequence by both readers ( P 0.001). No significant differences between mean tumor ADC values of both sequences (0.991 ± 0.121 vs. 0.100 ± 0.126 × 10 ‐3 mm 2 /s, P = 0.617) were noted. Apart from T1 stage, T staging of rectal cancer was inversely correlated with ADC values of rFOV DWI ( r = –0.688, P 0.001) and fFOV DWI sequences ( r = –0.641, P 0.001). Conclusion The rFOV DWI sequence provided significantly better IQ and lesion conspicuity than the fFOV DWI sequence. In addition, rFOV and fFOV DWI sequences can be used in evaluation of histological T staging of rectal cancer. Level of Evidence: 3 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2018;47:967–975.
机译：目的，将图像质量（IQ）与3T的降低视野（RFOV）和全FFOV（FFOV）扩散加权成像（DWI）序列的图像质量进行比较，具有直肠癌的组织学T分期作为参考标准。所有，81例直肠癌患者的材料和方法接受磁共振（MR）扫描（3.0T），包括RFOV和FFOV DWI序列。使用配对T -Test定量评估信噪比（SNR）和对比度噪声比（CNR）。两个放射科医生独立评估主观智商参数，包括图像清晰度，失真，工件，病变链接和两个序列的总体主观IQ。 Wilcoxon签名的等级测试用于比较DWI序列之间的主观IQ分数和肿瘤表观扩散系数（ADC）。 Spearman相关性分析用于将ADC值相关，并进行直肠癌的相应T分期。结果RFOV DWI中CNR显着高于FFOV DWI（7.15±2.77 Vs. 5.39±2.08，P <0.001）。 RFOV DWI的SNR显着高于FFOV DWI（44.17±11.01与34.76±13.30，P <0.001）。 RFOV DWI序列的主观IQ参数通过两个读数器优于FFOV DWI序列的主观IQ参数（P <0.001）。注意到，两种序列的平均肿瘤ADC值之间没有显着差异（0.991±0.121与0.100±0.126×10 -3 mm 2 / s，p = 0.617）。除了T1阶段之外，直肠癌的T分期与RFOV DWI（R = -0.688，P <0.001）和FFOV DWI序列的ADC值与ADC值相反（R = -0.641，P <0.001）。结论RFOV DWI序列提供比FFOV DWI序列更好的IQ和病变阴性。此外，RFOV和FFOV DWI序列可用于评估直肠癌的组织学T分期。证据水平：3技术疗效：第2阶段J. MANG。恢复。 2018年成像; 47：967-975。

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