在扫描是应在相应的位置添加局部匀场,或应尽量将扫描FOV中心置于其易产生相应伪影的位置。胃肠道积气或腹水较多时,如使用自由稳态进动序列(FIESTA,Balance-FFE,True-FISP)扫描,则会出现严重的磁敏感伪影。此时可以使用单次激发序列扫描。特别是3.0T MRI,腹部冠状位更...
MRI多参数、多序列的成像特点造就了其图像的多样性与多变性,同时由于MRI成像原理及过程较为复杂,图像受诸多因素的影响,很容易产生相应的伪影。临床扫描中所得的每一幅MRI图像或多或少都会有相应的伪影,绝大多数的伪影都不利于我们对图像地解读,如伪影掩盖病灶,则会造成漏诊,如错将伪影当作病变,则会造成误诊。正确...
MRI多参数、多序列的成像特点造就了其图像的多样性与多变性,同时由于MRI成像原理及过程较为复杂,图像受诸多因素的影响,很容易产生相应的伪影。临床扫描中所得的每一幅MRI图像或多或少都会有相应的伪影,绝大多数的伪影都不利于我们对图像地解读,如伪影掩盖病灶,则会造成漏诊,如错将伪影当作病变,则会造成误诊。正确...
MRI of the brain stem using fluid attenuated inversion recivery pulse sequences MRI-FLAIR images of the head show corticospinal tract alterations in ALS patients more frequently than T2-, T1-and proton-density-weighted images. J ... BD Coene,JV Hajnal,JM Pennock,... - 《Neuroradiology》 ...
摘要:随着快速扫描序列的出现,胎儿磁共振迅速发展。磁共振检查因其软组织分辨率高,扫描视野大,在排除胎儿颅脑畸形方面较超声更具优势,因而成为越来越重要的产前筛查手段,具有广泛的临床应用前景。本文就胎儿颅脑磁共振的安全性、适应症、扫描序列、检查注意事项及临床
C: After the birth of the fetus, brain MRI showed obvious edema of the scalp. D: Pleural effusion was seen by ultrasound.Fig. 2 34 +3 weeks of gestation, single test tube (IVF-ET). A: coronal FIESTA sequence. Fetus had bilateral pleural effusion at 29 weeks of gestation, with a ...
PULSESEQUENCES Standard: SE, IR, 2D/3D GRE andSPGR, Angiography: 2D/3DTOF, 2D/3DPhaseContrast;; 2D/3DFSE, 2D/3D FGRE and FSPGR, SSFP,FLAIR, EPI, optional: 2D/3DFiesta, FGRET,Spiral,Tensor IMAGING MODES Localizer, singleslice, multislice, volume, fast, POMP,multi slab,cine ...
胎儿先天性心脏病MRI诊断的初步探讨_董素贞
前庭神经鞘瘤在3d-t1w上表现出强烈的对比增强,界限清晰.3d-true fisp/双激励(siemens: 3d-ciss/ge: 3d- fiesta - c)或3d-t2w fse/tse序列为靶标体积定义提供额外信息.在这些重t2加权序列中,前庭神经鞘瘤和伴随的颅神经在明亮的脑脊液背景前表现为低信号.3d-true fisp/dual excitation(siemens: 3d-ciss/...
Fiesta 2D Fiesta 3D Delayed Enhance Asset, 3D FRFSE Asset Plus Tricks Fiesta-c Breast2 Propeller DWI 3D FS Fiesta Propeller T2 2D FS Fiesta MR-Echo 8 Ch System Lava Multi-Phase BF and VM Time course 2D Merge Lava-XV Bravo Cosmic HDx key 3D Dual Echo ARC, Inhance 2D Inflow Inhance 3D...