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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: NMR Biomed. 2015 Feb 12;29(2):187–196. doi: 10.1002/nbm.3265

Figure 2.

Figure 2

Custom-built coils for human cardiac 23Na MRI at 1.5 Tesla (16.9 MHz). (a) Square 25×25 cm three-turn transmit/receive surface coil used for quantitative cardiac TSC studies employing adiabatic excitation (21). The coil has 3 embedded vials of saline gel to serve as sensitivity references, and a mount permitting exchange with a conventional cardiac 1H coil for cardiac MRI (21,22). (b) A 4-channel 23Na phased-array constructed from 15-cm, 3-turns coils for increased inductance at the lower 23Na frequency (46). The detectors were fabricated on 0.25-mm thick flexible printed circuit board, with a separate 40-cm square single-turn transmit coil for excitation.