Faster Inversion Recovery Prepared T1 weighted segmented turbo field echo sequence (IR-TFE): Evaluating options for eliminating the start-up shot
© Krishnamurthy et al; licensee BioMed Central Ltd. 2011
Published: 2 February 2011
In conventional multi-shot IR-TFE sequences, e.g., clinical myocardial viability imaging, data collected during the first one or two shots is ignored, to minimize signal intensity variation across the shots. For a typical 8-10 heartbeat acquisition, such dummy shots results in scan overhead of 10-15% longer scan time. We evaluate the effect of removing the start-up shots in such IR-TFE sequences, and minimizing the effect of resulting artifacts
The purposes of this work are two fold: (a) to theoretically analyze and experimentally evaluate the impact of removing the startup shot in a conventional cardiac viability sequence, and (b) evaluate potential mechanisms for minimizing the artifacts stemming from the removal of start-up shots.
We hypothesize that by reducing the flip-angle of the IR pulse during the first shot one can minimize the signal amplitude modulation between the shots.
Theory and methods
Our theoretical and experimental models suggest that, by modulating the flip angle of the magnetization preparation pulse, it is possible to significantly reduce artifacts arising from accepting data from dummy shots.
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