- Poster presentation
- Open Access
Myocardial delayed enhancement using parallel imaging with an overlapping partial-Fourier acquisition and variable k-space segmentation
© Slavin et al; licensee BioMed Central Ltd. 2010
Published: 21 January 2010
Myocardial delayed enhancement (E) using T1-weighted inversion-recovery gradient-echo imaging has become the gold standard for assessing myocardial viability. One drawback of the technique is the requirement for multiple long breath holds in order to cover the entire heart. Such an acquisition can be difficult for the patient and may cause degraded image quality. Partial Fourier and parallel imaging can be used to reduce scan time; however, both approaches noticeably reduce the already low signal-to-noise ratio (SNR) and can potentially introducing additional artifacts.
The goal of this work was to decrease the acquisition time of E while attempting to minimize the negative impact of scan reduction techniques.
E imaging was performed on one patient, with and without ARC. Each slice required four heartbeats. Using one dummy heartbeat, three slices were acquired in a 13-heartbeat breath hold. Views per segment (VPS) with and without ARC were 23 and 36, respectively, resulting in temporal resolutions of 110 and 173 msec.
E is often performed as a fully sampled 2NEX scan. Overlapping partial-Fourier reduces both the number of ky lines and SNR, although it maintains 2NEX at the center of k-space. Adding ARC with variable segmentation also maintains central 2NEX but further reduces data acquisition, giving better temporal resolution and reduced blurring. The oversampled center partially preserves SNR and provides more robust reconstruction than other parallel imaging methods. However, SNR is somewhat reduced overall. Nevertheless, slightly increasing the scan time beyond four heartbeats may mitigate the SNR loss and/or allow higher spatial resolution by increasing VPS.