MR小视野扩散加权成像在肾上腺结节中的应用价值

The application of reduced field of view diffusion weighted imaging in adrenal nodule

目的:探讨MR小视野扩散加权成像(rFOV DWI)在肾上腺结节中的应用价值。方法:纳入24例肾上腺占位患者,所有患者均行常规平扫、全视野扩散加权成像(fFOV DWI)及rFOV DWI扫描(b=0、800s/mm2)。由2位影像诊断医师通过5分法对DWI图像质量进行主观评分,利用eADC软件测定肾上腺结节的ADC值。结果:rFOV DWI图像主观评分为(4.68±0.65)分,高于fFOV DWI图像[(3.79±0.59)分],差异有统计学意义(Z=-4.329,P<0.01)。fFOV DWI及rFOV DWI测得的腺瘤组与非腺瘤组ADC值差异均无统计学意义(P值均>0.05)。结论:rFOV DWI可获得更高的组织分辨力,清晰显示病变与正常肾上腺的关系,为肾上腺小结节及增生性病变的诊断提供更多依据,ADC值在肾上腺结节定性诊断方面价值有限。

Objective： To study the application of reduced field of view diffusion weighted imaging （rFOV DWI） in adrenal nodules. Methods： 24 patients with adrenal nodule were included in this study. The routine plain scan,full field of view DWI （fFOV DWI） and rFOV DWI were performed with b= 0,800s/mm2. Image quality was evaluated by two radiologists with five-point scale and the ADC value of adrenal nodules were measured by eADC software. Results：The score of image quality with rFOV DWI was 4.68±0.65 ,which was significantly higher than that of f FOV DWI 3.79±0.59 （Z=-4. 329,P〈0.01）. There was no significant difference between adenoma and non-adenoma in ADC value no matter using rFOV DWI or fFOV DWI （all P〉0.05）. Conclusions：rFOV DWI sequence could achieve higher tissue resolution, and clearly show the relationship between adrenal nodule and normal adrenal gland,providing more evidence in the diagnosis of adrenal nodule and hyperplastic lesion. However,ADC value has limited value in the qualitative diagnosis of adrenal nodule.