Publications

PURPOSE

To design and evaluate two-dimensional (2D) L1-SPIRiT accelerated spiral pulse sequences for first-pass myocardial perfusion imaging with whole heart coverage capable of measuring eight slices at 2 mm in-plane resolution at heart rates up to 125 beats per minute (BPM).

METHODS

Combinations of five different spiral trajectories and four k-t sampling patterns were retrospectively simulated in 25 fully sampled datasets and reconstructed with L1-SPIRiT to determine the best combination of parameters. Two candidate sequences were prospectively evaluated in 34 human subjects to assess in vivo performance.

RESULTS

A dual density broad transition spiral trajectory with either angularly uniform or golden angle in time k-t sampling pattern had the largest structural similarity and smallest root mean square error from the retrospective simulation, and the L1-SPIRiT reconstruction had well-preserved temporal dynamics. In vivo data demonstrated that both of the sampling patterns could produce high quality perfusion images with whole-heart coverage.

CONCLUSION

First-pass myocardial perfusion imaging using accelerated spirals with optimized trajectory and k-t sampling pattern can produce high quality 2D perfusion images with whole-heart coverage at the heart rates up to 125 BPM. Magn Reson Med 76:1375-1387, 2016. © 2015 International Society for Magnetic Resonance in Medicine.

OBJECTIVE

To understand the health care access issues faced by Los Angeles (LA) County's uninsured and residually uninsured after implementation of the Affordable Care Act (ACA) and to identify potential solutions using a community-partnered dialogue.

DESIGN

Qualitative study using a community-partnered participatory research framework.

SETTING

Community forum breakout discussion.

DISCUSSANTS

Representatives from LA County health care agencies, community health care provider organizations, local community advocacy and service organizations including uninsured individuals, and the county school district.

MAIN OUTCOME MEASURES

Key structural and overarching value themes identified through community-partnered pile sort, c-coefficients measuring overlap between themes.

RESULTS

Five overarching value themes were identified - knowledge, trust, quality, partnership, and solutions. Lack of knowledge and misinformation were identified as barriers to successful enrollment of the eligible uninsured and providing health care to undocumented individuals. Discussants noted dissatisfaction with the quality of traditional sources of health care and a broken cycle of trust and disengagement. They also described inherent trust by the uninsured in "outsider" community-based providers not related to quality.

CONCLUSIONS

Improving health care for the residually uninsured after ACA implementation will require addressing dissatisfaction in safety-net providers, disseminating knowledge and providing health care through trusted nontraditional sources, and using effective and trusted partnerships between community and health care agencies with mutual respect. Community-academic partnerships can be a trusted conduit to discuss issues related to the health care of vulnerable populations.