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Echo-planar imaging.
DeLaPaz RL.
Department of Radiology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021.
Radiographics. 1994 Sep;14(5):1045-58
Echo-planar imaging is a fast magnetic resonance (MR) imaging technique that allows acquisition of single images in as little as 20 msec and performance of multiple-image studies in as little as 20 seconds. Echo-planar imaging achieves its speed by obtaining all spatial-encoding information after a single radio-frequency (RF) excitation. Conventional imaging requires multiple-RF excitations, separated by the repetition time (TR), to acquire this information. An "infinite" TR, routine lipid suppression, and sensitivity to magnetic susceptibility are other features of echo-planar imaging. Standard pulse sequences are used to obtain echo-planar images, which have diagnostic utility similar to that of conventional MR images. Echo-planar imaging is less sensitive to motion than is conventional MR imaging and allows imaging of rapidly changing physiologic processes such as blood flow and kinetic activity. Echo-planar imaging is opening new areas of MR imaging research and clinical applications.
Posted via PubMed for educational and discussion purposes only.
Link to PubMed Reference
Department of Radiology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021.
Radiographics. 1994 Sep;14(5):1045-58
Echo-planar imaging is a fast magnetic resonance (MR) imaging technique that allows acquisition of single images in as little as 20 msec and performance of multiple-image studies in as little as 20 seconds. Echo-planar imaging achieves its speed by obtaining all spatial-encoding information after a single radio-frequency (RF) excitation. Conventional imaging requires multiple-RF excitations, separated by the repetition time (TR), to acquire this information. An "infinite" TR, routine lipid suppression, and sensitivity to magnetic susceptibility are other features of echo-planar imaging. Standard pulse sequences are used to obtain echo-planar images, which have diagnostic utility similar to that of conventional MR images. Echo-planar imaging is less sensitive to motion than is conventional MR imaging and allows imaging of rapidly changing physiologic processes such as blood flow and kinetic activity. Echo-planar imaging is opening new areas of MR imaging research and clinical applications.
Posted via PubMed for educational and discussion purposes only.
Link to PubMed Reference
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