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Full-Text Articles in Biomedical Engineering and Bioengineering
Pre-Amplifiers For A 15-Tesla Magnetic Resonance Imager, Chin-Leong Lim, Peter Serano, Jerome L. Ackerman
Pre-Amplifiers For A 15-Tesla Magnetic Resonance Imager, Chin-Leong Lim, Peter Serano, Jerome L. Ackerman
Chin-Leong Lim
High-field magnetic resonance imagers (MRI) give better signal-to-noise ratio (SNR) and image contrast. However clinical MRIs are currently limited to 3 Tesla (T) magnetic field strength. To create an uncommon 15 T scanner for research use, we evaluated several low-cost, intended for wireless communication, GaAs enhancement-mode pseudomorphic high electron mobility transistors (ePHEMT) in the critical preamplifier slot. This paper reports the experimental results that were obtained at both module and system levels. When evaluated in our prototype 15 T scanner front-end’s preamplifier slot, the candidate devices’ sub 1dB noise figures enabled image SNR ~ 110 in a water phantom (test …
High-Speed Digital Holographic Methods To Characterize The Transient Acousto-Mechanical Response Of Human Tm, I Dobrev, C Furlong, J T. Cheng, J J. Rosowski
High-Speed Digital Holographic Methods To Characterize The Transient Acousto-Mechanical Response Of Human Tm, I Dobrev, C Furlong, J T. Cheng, J J. Rosowski
Ivo Dobrev
Human hearing relies on a delicate sequence of energy transformations from the sound waves in the outer-ear, through mechanical vibrations in the middle-ear, to pressure waves of the fluid in the inner-ear. The investigation of hearing process requires the study of the function of the tympanic membrane (TM) in the energy transformation at the interface of the outer and middle-ear. The investigation of this process requires tools to quantify the acousto-mechanical response of the TM while overcoming the challenges associated with its dimensions, confined location, and the high temporal and spatial complexity of its nanometer scale motions that also relate …