Hsu-Lei Lee

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Balanced steady-state free precession (SSFP) imaging is limited by off-resonance banding artifacts, which occur with periodicity 1/TR in the frequency spectrum. A novel balanced SSFP technique for widening the band spacing in the frequency response is described. This method, called wideband SSFP, utilizes two alternating repetition times with alternating RF(More)
PURPOSE To suppress off-resonance artifacts in coronary artery imaging at 3 Tesla (T), and therefore improve spatial resolution. MATERIALS AND METHODS Wideband steady state free precession (SSFP) sequences use an oscillating steady state to reduce banding artifacts. Coronary artery images were obtained at 3T using three-dimensional navigated gradient(More)
OBJECT To develop a signal model for accurate prediction of myocardial signal during cine-balanced steady-state free precession (bSSFP) imaging. METHODS We present a signal model that takes into account the effects of non-ideal slice profile, off-resonance, and radio-frequency transmit variation on myocardial signal behavior. Each of the three factors was(More)
Alternating TR steady-state free precession (ATR SSFP) has been proposed as a method to achieve a favorable frequency response compared to that of conventional balanced SSFP. ATR SSFP, much like conventional SSFP, exhibits oscillatory transient signal behavior that can degrade image quality. Thus an efficient preparation scheme is desired in order to(More)
Cine balanced steady-state free precession (SSFP) is the most widely used sequence for assessing cardiac ventricular function at 1.5 T because it provides high signal-to-noise ratio efficiency and strong contrast between myocardium and blood. At 3 T, the use of SSFP is limited by susceptibility-induced off-resonance, resulting in either banding artifacts or(More)
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