So N M C, Lam W W M, Mann D, Leung K L, Metreweli C
Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, Hong Kong, People's Republic of China.
Clin Radiol. 2003 Jul;58(7):555-9. doi: 10.1016/s0009-9260(03)00126-0.
To evaluate the feasibility of using air as intraluminal contrast medium in magnetic resonance (MR) colonography.
Twenty-two patients underwent MR colonography (MRC) using air before colonoscopy. All patients were imaged in prone and supine positions. Each colon was divided into five segments. Two radiologists reviewed the images for the degree of colonic distension, image quality and colonic lesions. The colonic lesions identified using MR were compared with those identified on colonoscopy.
Eight men and 14 women with mean age of 55.5 years were studied. All patients completed the MR examination. One hundred and five out of 110 (95.5%) colonic segments were well distended in both prone and supine positions. Image quality was good in all cases. Colonoscopy detected 16 lesions: three > or = 1 cm, one 7 mm lesion and 12 lesions < or = 5 mm. All lesions 1 cm or larger were detected by MRC.
MRC using air and the single-shot half-Fourier rapid acquisition with refocused echoes (RARE) technique is feasible. But in this small pilot study, it had low sensitivity for the detection of polyps less than 1 cm in diameter.
评估在磁共振结肠成像中使用空气作为腔内对比剂的可行性。
22例患者在结肠镜检查前接受了利用空气的磁共振结肠成像（MRC）。所有患者均在俯卧位和仰卧位进行成像。每段结肠分为五个节段。两名放射科医生对图像的结肠扩张程度、图像质量和结肠病变进行评估。将磁共振成像识别出的结肠病变与结肠镜检查发现的病变进行比较。
研究对象包括8名男性和14名女性，平均年龄55.5岁。所有患者均完成了磁共振检查。110个结肠节段中有105个（95.5%）在俯卧位和仰卧位均扩张良好。所有病例图像质量均良好。结肠镜检查发现16处病变：3处≥1 cm，1处7 mm病变，12处≤5 mm病变。所有1 cm或更大的病变均被磁共振结肠成像检测到。
使用空气及单次激发半傅里叶重聚回波快速采集（RARE）技术进行磁共振结肠成像可行。但在这项小型初步研究中，其对直径小于1 cm息肉的检测敏感性较低。
