http://www3.qihu.org/Service/article/view_article.asp?id=506 Web图7-15 haste序列脉冲示意图 在一次90°脉冲后利用连续的复相脉冲采集填充k空间一半多一点,剩余的k空间则根据k空间对称性原理进行填充 图7-16 haste序列图像 a.肝脏冠状位图像;b.胃肠道冠状位图像;c.mrcp水成像;d.心脏黑血像;e.胎儿成像
MR信号是通过接收线圈采集到的,MR信号提供一定的频率、幅度 …
WebOct 9, 2024 · 自旋回波序列(se):1个90°射频脉冲+180°聚焦脉冲. 快速自旋回波序列(tse):1个90°射频脉冲+多个180°聚焦脉冲. 梯度回波序列(gre):1个小角度射频脉冲+梯度场切换采集回波信号. 平面回波序列(epi):不同准备脉冲+梯度场切换采集多个回波信号 WebPurpose: To assess T2 HASTE MR in acute abdominal imaging and ascertain if it is a reliable alternative to CT in patients under 60. Method and materials: In a prospective diagnostic performance study from January 2009 to December 2013, patients under 60 presenting with acute abdominal pain, that required imaging following surgical review, … definition playa
3.0 T MRI常规脉冲序列在肺癌中的应用_参考网
WebHASTE/SS-FSE is a single-shot technique. This means that data from all of k -space is obtained after a single 90º-excitation pulse. This requires very long echo trains, which in modern scanners may number 128, 256, or even higher. By comparison, "regular" FSE/TSE is a multi-shot technique. Web西门子中,采用单激发TSE序列,打开半扫描(同飞利浦一样),这个序列就有一个专有名称。HASTE(half-Fourier acquisition single-shot turbo spin-echo, HASTE)。 ... 另外,为了在短TR时间,也达到T2权重,我们会用一个负90°的脉冲,把横向磁化矢量打回纵轴,加速纵 … WebDec 7, 2024 · fse序列连续的180°脉冲可打断j-耦连,使脂肪组织的质子失相位减慢,延长脂肪组织的t2值,因此增加了脂肪组织的信号强度 180°脉冲引起的磁化转移效应也是增加脂肪组织信号强度的一个原因 三、半傅立叶采集单次激发快速自旋回波序列(haste序列) haste序列即 ... definition playbill