CAJ | 학술논문

目的：通过比较健康志愿者骶髂关节MRI在不同b值时弥散加权成像（ DWI）表现及表观扩散系数（ADC）值的差异，探寻3.0T MRI弥散加权成像显示骶髂关节的最适宜b值。方法选择23名健康志愿者，年龄18～37岁，采用3.0 T超导磁共振扫描仪，行骶髂关节斜冠状T1 WI、抑脂T2WI及多b值（0、400、600、800 s／mm2）DWI扫描，观察不同b值时双侧骶髂关节的显示情况；测量双侧骶髂关节的骶侧、髂侧关节旁骨髓不同b值时的ADC值并进行统计学分析。结果 b值为400、600 s／mm2时，DWI图像清晰，无变形，无明显伪影产生，对比度良好；b值为800 s／mm2时，图像伪影稍大，并可见轻度变形，对比度略差。双侧骶髂关节旁骨髓ADC值随b值增加逐渐变小；方差分析显示，4个部位的3组骨髓ADC值间差异均有统计学意义。 b值为600 s／mm2时，双侧髂骨及骶骨骨髓ADC值间差异无统计学意义；b值为600 s／mm2和800s ／mm2时，双侧骶髂关节旁骨髓ADC值离散度小；b值为400 s／mm2时，ADC值离散度大。结论 b值为600 s／mm2时，骶髂关节的ADC值稳定可靠、图像质量好，为DWI扫描的适宜b值。
목적：통과비교건강지원자저가관절MRI재불동b치시미산가권성상（ DWI）표현급표관확산계수（ADC）치적차이，탐심3.0T MRI미산가권성상현시저가관절적최괄의b치。방법선택23명건강지원자，년령18～37세，채용3.0 T초도자공진소묘의，행저가관절사관상T1 WI、억지T2WI급다b치（0、400、600、800 s／mm2）DWI소묘，관찰불동b치시쌍측저가관절적현시정황；측량쌍측저가관절적저측、가측관절방골수불동b치시적ADC치병진행통계학분석。결과 b치위400、600 s／mm2시，DWI도상청석，무변형，무명현위영산생，대비도량호；b치위800 s／mm2시，도상위영초대，병가견경도변형，대비도략차。쌍측저가관절방골수ADC치수b치증가축점변소；방차분석현시，4개부위적3조골수ADC치간차이균유통계학의의。 b치위600 s／mm2시，쌍측가골급저골골수ADC치간차이무통계학의의；b치위600 s／mm2화800s ／mm2시，쌍측저가관절방골수ADC치리산도소；b치위400 s／mm2시，ADC치리산도대。결론 b치위600 s／mm2시，저가관절적ADC치은정가고、도상질량호，위DWI소묘적괄의b치。
Objective To compare diffusion weighted imaging ( DWI) results in different b values and apparent diffusion coefficient ( ADC) values of sacroiliac joint in healthy volunteers , for searching the optimal b value of sacroiliac joint displayed by 3.0T MRI DWI.Methods Twenty-three healthy volunteers were enrolled randomly in this study .Oblique coronal plane T1WI and fat suppression T2WI as well as multi-b value(0,400,600,800 s/mm2)DWI were performed by 3.0T superconducting MRI scanner.The displayed results were observed on bilateral sacroiliac joint and ADC values of bone marrow besides the sacroiliac joint were measured with different b values .Statistical analysis was performed .Results Clear images with high contrast ratio of 23 healthy volunteers could clearly show the sacroiliac joints when the b values were 400 s/mm2 and 600 s/mm2 .When the b value was 800 s/mm2 , the images had larger image artifacts , fuzzy image quality and poor contrast ration .The ADC values of bone marrow besides bilateral sacroiliac joint decreased gradually with the increase of the b values .The differences on ADC values of bone marrow of right ilium ,right sacrum and besides left sacroiliac joint were statistically significant .When the b value was 600 s/mm2 ,there was no statistical significance on the ADC value of bone marrow of bilateral ilium and sacrum .When the b value was 600 s/mm2 and 800 s/mm2 ,the dispersion of ADC of sacroiliac joint surrounding bone marrow was small , while the b value was 400 s/mm2 ,the dispersion of ADC of sacroiliac joint was large .Conclusion When the b value is 600 s/mm2 ,the ADC value of the sacroiliac joint is stable and reliable ,has good image quality .The optimal b value for sacroiliac joint DWI scanning is 600 s/mm2 .