Evaluation of nasopharyngeal image quality from the ZOOMit DWI and RESOLVE DWI techniques
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摘要:
目的 对3.0 T MR的RESOLVE DWI和小视野ZOOMit DWI技术在鼻咽部的图像质量进行比较。 方法 回顾性分析2021年1~10月在医院行3.0 T MR鼻咽部扫描的40例患者。同时扫描ZOOMit DWI和RESOLVE DWI两种不同扩散成像序列扫描，并对这两种扩散加权成像进行定量分析和主观评分。 结果 两种不同扩散成像序列图像清晰度、伪影和失真的主观评分之间的差异有统计学意义（P < 0.05）。ZOOMit DWI序列的清晰度最好，失真和伪影最少。两种不同扩散加权序列的信噪比、对比噪声比（b=50 s/mm2）无明显差异。ZOOMitDWI的信噪比、对比噪声比（b=800、1000 s/mm2）优于RESOLVE DWI。 结论 与RESOLVE DWI相比，ZOOMit DWI序列扫描的图像质量更好，适合作为鼻咽部MRI扩散成像的首选序列。 Abstract:Objective To compare the nasopharyngeal image quality with RESOLVE DWI and ZOOMit DWI in 3.0 T MR. Methods Forty patients who underwent 3.0 T MR nasopharyngeal scan in hospital from January to October 2021 were retrospectively analyzed. Two different diffusion imaging sequences, ZOOMit DWI and RESOLVE DWI, were scanned simultaneously, and the two diffusion weighted images were quantitatively analyzed and subjectively scored. Results The subjective scores of image sharpness, artifact and distortion were significantly different between two different diffusion imaging sequences (P < 0.05). ZOOMit DWI sequences had a better sharpness and less distortion and artifacts. SNR and CNR (b=50 s/mm2) of the two diffusion-weighted sequences showed no significant difference. The SNR and CNR (b=800 and b=1000 s/mm2) of ZOOMit DWI were better than that of RESOLVE DWI. Conclusion ZOOMit DWI sequence has better image quality than RESOLVE DWI sequence and it is suitable for MRI diffusion imaging of nasopharynx. -
Key words:
- nasopharynx /
- magnetic resonance imaging /
- diffusion imaging
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图 1 某鼻咽癌患者（男，34岁）的影像学表现
A: 采用ZOOMit DWI（b=1000 s/mm2）对肿块局部激励; B: 采用RESOLVE DWI（b=1000 s/mm2）序列采集的图像; C: 采用RESOLVE DWI（b=1000 s/mm2）序列采集的颈部淋巴结肿大.
Figure 1. Image findings of a 34-year-old male patient with nasopharyngeal cancer.
图 2 两种不同扩散加权成像的SNR及CNR
*P < 0.05.
Figure 2. SNR and CNR of two diffusion-weighted images.
表 1 MRI扫描序列及参数
Table 1. MRI scan sequence and parameters
参数 TR(ms) TE(ms) TA(min) FOV(mm) 矩阵 层数 层厚(mm) 体素 ZOOMit DWI 4200 80 3:11 18×54 134×134 20 4 0.7×0.7×4 RESOLVE DWI 2850 55 5:25 23×230 160×160 20 4 1.0×1.0×4 
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表 2 两种不同扩散加权序列的主观评分比较
Table 2. Comparison of subjective scores between two diffusion-weighted sequences (n=40, Mean±SD)
评价指标 ZOOMit DWI RESOLVE DWI F P 清晰度 3.51±0.47 3.07±0.49 1.09 < 0.001 失真 3.37±0.52 3.03±0.53 1.04 0.003 伪影 3.19±0.54 3.01±0.51 1.12 0.065
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