文档介绍：MRI检查中首选Frue FISP扫描序列对壶腹癌的诊断价值
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作者:刘智明马湘乔葛晶张俊发贾伟韩旭
【摘要】目的运用磁共振稳态梯度回波序列(True FISP)获取壶腹部冠状位的兴趣区图像,探讨MRI多种成像序列中True FISP序列作为首选对壶腹癌的诊断价值。方法收集经手术病理证实的壶腹癌27例,首选True FISP序列扫描,获取冠状位兴趣区成像,对其影像学表现特征进行回顾性分析。结果 27例壶腹癌,True FISP序列显示胆总管截断10例、12指肠乳头处充盈缺损9例、胆总管受压变窄6例、胆总管远端显示不清2例。结论磁共振稳态梯度回波序列(Truei FISP)可显示胆管系统,作为首选序列加MRI多种成像序列,对诊断壶腹癌具有重要作用。
【关键词】磁共振成像壶腹癌胆管系统
Abstract:Objective: To study the value of True FISP sequence in diagnosis of ampulary carcinoma. Materials and Metheds: The MRI date of 27 cases with ampulary carcinoma diagnosed by operation and pathology were analyzed retrospectively. True FISP sequence is used as first choice in the MRI examination for all pationts. Results: In 27 cases with ampulary carcinoma ,the signal features in the True FISP sequnce mon bile duct cut-off strcture in 10 cases, no signal filling defect in 9 cases, press narrow in 6 cases, vision unclear in 2 cases. Conclusion: True FISP as the sequence of first choice in the MRI examination for the pationts who have ampulary carcinoma has important value. .
Key words: ic resonance imaging, ampulary carcinoma, bile duct system
在梯度回波(GRE)小反转角成像时,纵向磁矩在数次脉冲后出现稳定值,导致组织T1值对图像的影像很小。如果TE也很短,远短于T2* 值,那么,此时横向磁矩也会在数个脉冲后趋向一个稳定值,此时组织T2*值对图像的影响也很小了,而真正对图像产生影响的组织的质子密度,这种特殊的稳定状态下的梯度回波成像就被称为稳态梯度回波序列(true FISP),(,)[1]。稳态梯度回波序列首选于腹部冠状位扫描,显示胆管系统,结合其他扫描序列,对壶腹癌的诊断有着重要的意