Biomedical subjects
R S Mackay
Publications and source records attributed to R S Mackay.
Maximum frequency indication: minima counting versus zero-crossing counting.
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Noninvasive measurement of fetal and neonatal blood flow.
A newly developed doppler ultrasound flow measuring instrument was applied to determination of aortic arch blood flow in 6 near-term fetuses and 2 neonates and to umbilical cord flow in 2 fetuses. The method and results are presented and indicate good agreement between this noninvasive technique and expected values for aortic arch flow in human fetuses and neonates.
Decompression studies using ultrasonic imaging of bubbles.
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Some effects of time post-mortem on ultrasonic transmission through tissue under different modes of handling.
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Continuous monitoring of cardiac output.
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Recent advances in biotelemetry and their applications to measurements of pressure and electrical changes in the oviduct in vivo.
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Decompression study and control using ultrasonics.
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Non-invasive cardiac output measurement.
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High pressure state simulation studies as an aid to understanding diving problems.
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Telemetry in animal and human biometeorology.
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Ultrasonic imaging of in vivo bubbles in decompression sickness.
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Biomedical telemetry: applications to psychology.
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A review and discussion of some methods for system identification and modeling.
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Applications of a new technique for system identification to dolphin temperature regulation and rabbit intraocular pressure control.
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Noninvasive blood flow measurements by Doppler ultrasound with application to renal artery flow determination.
A description of a new Doppler ultrasound flow measuring instrument is given along with representative measurements of blood flow in the canine renal artery and the human aortic arch, renal artery, and transplanted kidney renal artery. The instrument is briefly described, and a discussion of the limitations of the technique is presented.
Implanted transmitters and body fluid permeability.
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