Respiratory triggered imaging with an optical displacement sensor.
Motion of abdominal organs with respiration is a major problem in NMR spectroscopy and imaging thereof. Triggering each phase-encoding step with respiration or gating a number of phase-encoding steps is one approach to the problem. The design of a sensor for small animal experiments has not been as simple. An optical device, implemented with polymer optical fibres is described, along with associated hardware and electronics which can act as a trigger for small animal NMR experiments. A brief description of a similar device for human application is also given. 2DFT spin-echo and B0 susceptibility images, both triggered and untriggered, are presented to validate the technique.
Wilson
S J
SJ
Centre for Magnetic Resonance, University of Queensland, St. Lucia, Australia.
Brereton
I M
IM
Hockings
P
P
Roffmann
W
W
Doddrell
D M
DM
D000005:Abdomen / Q000033:anatomy & histology; D000818:Animals; D016477:Artifacts; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation* / Q000379:methods; D051379:Mice; D009038:Motion; D055096:Optical Devices; D055095:Optics and Photonics; D051381:Rats; D017208:Rats, Wistar; D012119:Respiration