Three-dimensional magnetic resonance imaging of rigid polymeric materials using single-point ramped imaging with T1 enhancement (SPRITE)
Three-dimensional magnetic resonance imaging of rigid polymeric materials using single-point ramped imaging with T1 enhancement (SPRITE)
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DOI：
10.1139/cjc-76-11-1753
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发表时间：
1998-11-01
期刊：
影响因子：
--
通讯作者：
Mastikhin, IV
中科院分区：
文献类型：
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作者：
Kennedy, CB;Balcom, BJ;Mastikhin, IV
一种新的MRT方法，最近用于多孔介质研究，介绍了刚性聚合物材料的成像。该方法，单点斜坡成像与T-1增强（SPRITE），被设计用于空间编码短寿命，T-2*，刚性材料的信号特征。我们通过将四种常见聚合物的二维SPRITE图像与相同物质的二维自旋回波图像进行比较，研究了SPRITE技术相对于传统成像方法的优势。我们通过成像两种商业产品来证明SPRITE的普遍适用性，一种是由氯化聚氯乙烯制成的截止阀，另一种是实心多层高尔夫球，两者都含有有效H-1自旋-自旋松弛时间T-2*的合成材料，远低于300 μ s。毫米分辨率的三维图像揭示了内部物理差异和化学不均匀性，这是传统MRI方法无法观察到的。我们还考虑在SPRITE中加入有源扰流梯度，用于显示具有长自旋-自旋松弛时间（T-2）的样品。
A new MRT method, recently employed in porous-media studies, is introduced for the imaging of rigid polymeric materials. The method, Single-Point Ramped Imaging with T-1, Enhancement (SPRITE), is designed to spatially encode short lifetime, T-2*, signals characteristic of rigid materials. We investigate the advantages of the SPRITE technique over conventional imaging methods by comparing a 2D SPRITE image of four common polymers to a 2D spin-echo image of the same substances. We demonstrate the general applicability of SPRITE by imaging two commercial products, a stop-valve made of chlorinated polyvinyl chloride and a solid-core, multilayer golf ball, both containing synthetic materials with effective H-1 spin-spin relaxation times, T-2*, well under 300 mu s. Three-dimensional images of millimeter resolution reveal internal physical differentiation and chemical inhomogeneities that cannot be observed using conventional MRI methods. We also consider the incorporation of active spoiler gradients in SPRITE for visualization of samples with long spin-spin relaxation times,T-2.