胰腺MRI:2D与3DFS-FLASH增强扫描序列的对比研究  

MR imaging of the pancreas: comparison between two-dimensional and three-dimensional gradient-echo sequence

作　　者：王静[1] 高磊[2] 陆建平[3] 武乐斌[1] 

机构地区：[1]山东省医学影像学研究所,山东济南250021 [2]山东省肿瘤医院,山东济南250117 [3]长海医院放射科,上海200433

出　　处：《中国临床医学影像杂志》2006年第10期572-574,587,共4页Journal of China Clinic Medical Imaging

摘　　要：目的:通过2D与3D增强扫描序列的对比研究,确定胰腺MRI最佳增强扫描序列。方法:40例胰外疾病患者随机分为2D组和3D组(每组各20例)。常规MRI平扫后行胰腺多时相动态增强扫描。测量平扫T1WI像及增强各期胰腺的信号强度,计算信噪比(SNR)及对比信噪比(CNR),并对图像质量进行评价。结果:平扫T1WI像:3D组胰腺SNR、胰腺-胰周脂肪CNR均明显低于2D组(19.2vs22.7,8.7vs15.2,P<0.05)。增强后扫描:3D组各期图像的胰腺SNR均高于同期扫描的2D组(37.8vs29.4;31.6vs28.8;29.6vs28.0),尤以胰腺实质期为明显(P<0.05),同时胰腺-胰周脂肪CNR及图像质量亦高于2D组(P<0.05)。结论:3DFLASH序列是胰腺MRI最优增强扫描序列,能更好地显示胰腺的解剖细节和血液动力学特征,有助于胰腺疾病的诊断及可切除性评价。Objective： Comparison of two-dimensional with three-dimensional sequence MRI, to determine the optimum dynamic enhancement sequence for the pancreas. Materials and Methods： Forty patients without any pancreatic disease were randomly assigned to 2D, 3D groups according to scanning sequences（2D and 3D FLASH）. After plain scan, the two groups were made multi-phase dynamic enhancement scanning of the pancreas. Mean signal intensities of pancreas of plain scanning and multi-phase dynamic enhancement scanning were measured, the signal to noise（SNR） and contrast to noise （CNR） were calculated, and image quality were assessed. Results： Plain scanning： the SNR of the pancreas in 3D group was 19.2 which was evidently lower than that of the 2D group（22.7, P〈0.05）; dynamic enhanced scanning： the SNR or CNR of the pancreas in 3D group were high than that of the 2D group, especially high in the first scanning（P〈0.05）, the best images of pancreas were obtained in this phase. Conclusion： 3D FLASH is the best dynamic enhanced sequence for pancreas. It offers the better confidence for a more specific and accurate diagnosis and provides more details of the segmental and vascular anatomy to facilitate surgical operation planning.

关 键 词：胰腺 磁共振成像 

分 类 号：R657.5[医药卫生—外科学] R445.2[医药卫生—临床医学]