CMRA with 100% navigator efficiency with 3D self navigation and interleaved scanning
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KeywordsPhilips Healthcare Cardiac Motion British Heart Foundation Comparable Image Quality Uncorrected Image
In recent years many novel self navigation techniques have been proposed to solve the problems associated with cardiac motion in coronary MR angiography (CMRA). A new method of interleaved scanning (iScan) allows more flexibility in designing and testing novel imaging sequences as independent scans, with different imaging parameters including k-space trajectories, can be interleaved. We compared the performance of a 3D self navigator (3DSN) with 100% scan efficiency to traditional 1D navigators, whereby the 3DSN scan was setup as a single shot scan and was called by the high resolution segmented multishot CMRA scan each cardiac cycle. We have shown in previous work that correcting all acquired data in foot-head (FH) and left-right direction (LR) can provide equivalent image quality to traditional gated scans (J Powell et al. 2013 Proc. ISMRM). Here we sought to investigate and compare the effect of correcting data in 3 dimensions (FH, LR and AP).
3DSN corrected MRA images achieve comparable image quality compared to 1D navigated images. As data is not rejected outside of a gating window, the 3DSN scans are performed with an effective navigator efficiency of 100%, substantially reducing scan time. In subjects with significant cardiac motion in a non FH direction, 3DSN should lead to better results. Future work will focus on using 3DSN images to generate affine transformation data, and perform affine motion correction.
This work was partially supported by a grant from Philips Healthcare, and a British Heart Foundation program grant (RG/12/1/29262).
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