Abstract

Methods Experiments were performed on a GE 1.5 T scanner with a 4-channel upper airway coil using custom real-time imaging software [3, 6]. The spiral trajectory design parameters were: 13-interleaf spiral, 20× 20 cm2 FOV, 2.4× 2.4 mm2 spatial resolution. Other parameters were: 6 mm slice thickness, gradient-echo sequence, 6.004 ms TR. The following acquisitions were used:(i) 13-interleaf spiral with pseudo-random temporal view order (Fig 1a) and (ii) pseudo-GR spiral trajectories with 21, 34, and 55 interleaves. We chose the Fibonacci numbers because the angle between the beginning and end of interleaves tends to be close to the golden-angle (≈ 222.49)(Fig 1d). The angle more closely approximates the golden-angle for larger Fibonacci numbers. A native English speaker was imaged while producing five utterances from the 460-sentence TIMIT corpus, presented using a mirror-projector setup [4 …

Date

2012

Authors

Yoon-Chul Kim, Nassos Katsamanis, Michael Proctor, Shrikanth Narayanan, Krishna S Nayak

Journal

Proc. Intl. Soc. Mag. Reson. Med

Volume

20

Pages

4209