Simultaneous 3D left and right coronary artery vessel wall imaging
© Scott et al; licensee BioMed Central Ltd. 2011
Published: 2 February 2011
To perform 3D imaging of the left and right coronary vessel walls in a single interleaved acquisition.
Vessel wall imaging is commonly gated to alternate R-waves, in order to increase SNR and minimise artefacts due to RR-interval variation. In previous work with 2D carotid artery wall imaging, the resulting redundant RR-interval has been used to acquire additional parallel slices. We postulate that the redundant RR-interval can be used to image an additional volume in 3D coronary artery wall imaging. In conjunction with highly efficient beat-to-beat respiratory motion correction (B2B-RMC), this could allow high resolution 3D acquisitions of both the left and right coronary walls in ~10minutes.
Acquisitions were performed in healthy subjects using a Siemens Avanto 1.5T scanner. The first and second volumes were positioned to obtain cross-sectional left and right coronary images respectively. The first reinversion slab was positioned to selectively reinvert the left coronary artery whilst avoiding reinversion of aortic blood and minimising reinversion of the tissue imaged in the right coronary artery volume. The second reinversion slab was similarly positioned for the right coronary artery. Inversion time was 400ms which is optimal for single R-wave gating at 60beats/minute.
We have demonstrated simultaneous left and right coronary artery wall imaging in the duration required to image a single artery. Used in conjunction with B2B-RMC, this has permitted high resolution 3D imaging of both the left and right coronary walls in approximately 10minutes. Future work will include a comparison with conventional alternate R-wave gating acquisitions and an investigation of the robustness of the technique to changes in RR interval.
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