title: Respiratory triggered imaging with an optical displacement sensor.
abstract: 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.
authors.affiliation: Centre for Magnetic Resonance, University of Queensland, St. Lucia, Australia.
authors.forename: S J
authors.initials: SJ
authors.lastname: Wilson
authors.forename: I M
authors.initials: IM
authors.lastname: Brereton
authors.forename: P
authors.initials: P
authors.lastname: Hockings
authors.forename: W
authors.initials: W
authors.lastname: Roffmann
authors.forename: D M
authors.initials: DM
authors.lastname: Doddrell
mesh_terms: 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