| 陆志华,蒋恒,翁晓燕,姚鸿欢,曹燕,陆文俊,胡芳,季立标.优化选择高和超高b值直肠癌弥散加权成像[J].中国医学影像技术,2020,36(12):1858~1862 |
| 优化选择高和超高b值直肠癌弥散加权成像 |
| Optimal selection of high and ultrahigh b value for diffusion weighted imaging in rectal cancer |
| 投稿时间：2019-12-12 修订日期：2020-08-18 |
| DOI：10.13929/j.issn.1003-3289.2020.12.021 |
| 中文关键词: 直肠肿瘤 弥散磁共振成像 b值 |
| 英文关键词:rectal neoplasms diffusion magnetic resonance imaging b value |
| 基金项目:江苏省青年医学重点人才计划（QNRC2016212）、苏州市临床重点病种诊疗计划专项（LCZX201823）、苏州市姑苏卫生人才培养项目（GSWS2019077）、常熟市科技发展计划（CS201624）。 |
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| 中文摘要: |
| 目的 比较高和超高b值弥散加权成像（DWI）图像质量和显示直肠癌效果，优化选择b值。方法 对58例直肠腺癌患者行多个b值（800、1 000、1 500、2 000 s/mm2）DWI扫描（DWI800、DWI1 000、DWI1 500、DWI2 000），对比图像质量和病变信号强度分级，测量并比较不同b值下肿瘤信噪比（SNR）、对比度噪声比（CNR）和信号强度比（SIR）。结果 DWI800、DWI1 000、DWI1 500及DWI2 000图像质量评分差异均有统计学意义（P<0.001），且DWI800、DWI1 000、DWI1 500图像质量评分呈升高趋势，DWI1 000与DWI1 500间差异有统计学意义（P<0.001）。DWI800、DWI1 000、DWI1 500图像信号强度为Ⅰ型者逐渐增多、Ⅱ型逐渐减少（P均<0.001），DWI1 500图像中无Ⅲ型信号；DWI2 000图像中Ⅰ型信号略少于DWI1 500，差异无统计学意义（P=0.096）。随b值升高，SNR、CNR和SIR均逐渐降低（P均<0.001）。结论 b值为800、1 000、1 500、2 000 s/mm2的DWI图像中，b=1 500 s/mm2时图像质量最优，显示直肠癌病灶最佳。 |
| 英文摘要: |
| Objective To compare image quality and display effect of rectal cancer with diffusion weighted imaging (DWI) using high and ultrahigh b value, so as to optimize b value selection. Methods Multiple b values (800, 1 000, 1 500 and 2 000 s/mm2) DWI scanning (DWI800,DWI1 000,DWI1 500 and DWI2 000) were performed on 58 patients with rectal adenocarcinoma. The imaging quality, grading signal intensity, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) and signal intensity ratio (SIR) were measured and compared among DWI images obtained using different b values. Results The image quality scores of DWI800, DWI1 000, DWI1 500 and DWI2 000 were statistically different (P<0.001). The image quality scores of DWI800, DWI1 000 and DWI1 500 showed an increasing trend, and the difference between DWI1 000 and DWI1 500 was statistically significant (P<0.001). On DWI800, DWI1 000, and DWI1 500 images, type Ⅰ signal lesions increased while type Ⅱdecreased gradually (all P<0.001), and there was no type Ⅲ signal on DWI1 500. The number of type Ⅰ signal lesions on DWI2 000 was slightly fewer than that of DWI1 500, but there was not statistical difference (P=0.096). With the increase of b value, SNR, CNR and SIR all gradually decreased (all P<0.001). Conclusion Among DWI images with b value of 800, 1 000, 1 500 and 2 000 s/mm2, image quality of b=1 500 s/mm2 was the best, and displaying of rectal cancer lesions was the best. |
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