Why the study?
Does an echo-train readout duration of 10-15 msec optimize image quality metrics in fast cardiac imaging at 1.5 T?
Does an echo-train readout duration of 10-15 msec optimize image quality metrics in fast cardiac imaging at 1.5 T?
For fast gradient-echo cardiac imaging at 1.5 T, an echo-train readout duration of 10-15 msec provides the optimal balance of signal-to-noise ratio and minimal artifacts.
May guide 1.5 T cardiac MRI protocol choices; extends technical optimization data but leaves clinical outcomes open.
Fast gradient-echo sequences that use an echo-train readout are becoming more widely used, particularly for imaging the heart. An important issue for these sequences involves determining the optimal duration for the echo-train readout. In normal volunteer scans and theoretically the echo-train readout duration was varied from 2.4 to 32.8 msec. Myocardial signal-to-noise ratio (SNR), myocardium-tag signal difference-to-noise ratio (SDNR), flow artifact-to-noise ratio (FNR), and geometric distortion were measured and/or calculated. Our results showed that to obtain high SNR, SDNR, and data acquisition efficiency while minimizing FNR and geometric distortion, the readout duration should be 10-15 msec at 1.5 T.
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Epstein et al. (2000) studied this question.
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