An interleaved-navigator projection dual-echo bSSFP sequence for respiratory self-gated imaging
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KeywordsResolution Projection Lower Temporal Resolution Readout Direction Waveform Design Irregular Breathing
Recently, self-navigation has become an alternative to breath-holding and respiratory navigators for cardiac MR scans [1, 2, 3]. Current sequences acquire a high spatial-resolution navigator projection every cardiac phase [i.e. ], a lower resolution navigator every TR, or a complete image with lower temporal resolution . Temporal or spatial resolution is sacrificed to minimize the loss of imaging efficiency. Here, we propose a dual-echo balanced SSFP-based imaging sequence that acquires a constant navigator projection during every TR and alternates navigator projection direction for robust motion measurement.
To develop a self-gating cine sequence for high-resolution imaging studies.
We present a pulse sequence specifically designed for high-resolution imaging, with two different but constant nav projections acquired in alternating TRs. The navigator direction was used to minimize TR. Neither image nor navigator orientation was chosen to align with the lung-liver interface: having dual navigators should increase the chance of capturing relevant motion patterns. The processing steps necessary to fully and automatically utilize such high spatial/temporal resolution projections remains to be explored. This technique has application in patient scans where breath-holds are not possible, or where the desired resolutions make breath-holds untenable.
This article is published under license to BioMed Central Ltd.