Iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) fast spin-echo imaging of the ankle: Initial clinical experience
Iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) fast spin-echo imaging of the ankle: Initial clinical experience
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DOI：
10.2214/ajr.05.0930
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发表时间：
2006-12-01
影响因子：
5
通讯作者：
Gold, Garry E.
中科院分区：
文献类型：
--
作者：
Fuller, Samuel;Reeder, Scott;Gold, Garry E.
目标。可靠、均匀的脂肪抑制很重要。目前存在多种方法，其中许多方法要么存在不理想的信噪比（SNR），要么无法获得踝关节周围一致的脂肪抑制。我们的目的是测试基于回波不对称的水和脂肪的迭代分解以及最小二乘估计（IDEAL）方法与快速自旋回波成像相结合的方法，该方法能够获得脂肪和水均匀分离的可靠的高信噪比图像。研究对象和方法。我们对32例患者的33个踝关节进行了IDEAL快速自旋回波与常规脂肪抑制快速自旋回波成像的比较。定量测量信噪比和比噪比效率，定性诊断图像质量和脂肪抑制评分。我们发现，两种技术对软骨和流体的信噪比效率相似，使用IDEAL快速自旋回波成像，流体/软骨的对比噪声比效率更高。IDEAL方法的脂肪抑制和诊断质量评分均优于快速自旋回声成像（p < 0.01）。IDEAL快速自旋回波成像技术是一种很有前途的踝关节MRI技术。
OBJECTIVE. Reliable, uniform fat suppression is important. Multiple approaches currently exist, many of which suffer from either suboptimal signal-to-noise ratio (SNR), or the inability to obtain consistent fat suppression around the ankle joint. Our purpose was to test iterative decomposition of water and fat with echo asymmetry and the least-squares estimation (IDEAL) method in combination with fast spin-echo imaging, which is able to achieve reliable high SNR images with uniform fat-water separation.SUBJECTS AND METHODS. We compared IDEAL fast spin-echo with conventional fat-suppressed fast spin-echo imaging in 33 ankles in 32 patients. Quantitative measurements of SNR and contrast-to-noise ratio efficiency were made, and qualitative diagnostic image quality and fat-suppression scores were determined.RESULTS. We found that the SNR efficiency for both cartilage and fluid was similar for both techniques, and fluid/cartilage contrast-to-noise ratio efficiency was higher with IDEAL fast spin-echo imaging. Fat suppression and diagnostic quality scores using the IDEAL method were superior (p < 0.01) to fat-suppressed fast spin-echo imaging.CONCLUSION. IDEAL fast spin-echo imaging is a promising technique for MRI of the ankle.