A computer system for on-line decoding of ultrasonic Doppler signals from blood flow measurement

Wille, S.Ø.

doi:10.1016/0041-624x(77)90086-5

Cited by 27 publications

(20 citation statements)

References 6 publications

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“…The doppler velocitymeter UNIDOP used in the present investigation and part of the computer systems used for data analysis have been described in detail elsewhere (Hatteland & Eriksen 1980, Wille 1977. Velocity measurements can be obtained from most vessels in the body, as long as the sound beam does not hit bone or gas spaces (lungs or parts of the intestines).…”

Section: The Ultrasound Doppler Velocitymetermentioning

confidence: 99%

“…The computer may calculate the spectrum as frequently as every 8 ms, using a fast fourier transform program, and also the mean velocity from each spectrum (Wille 1977). The doppler signal is recorded on one channel, and the ECG and comments are recorded on the other channel.…”

Section: The Ultrasound Doppler Velocitymetermentioning

confidence: 99%

“…From the ultrasound recording, the mean doppler frequencies were calculated each 8 rns through one or a few cardiac cycles as described in Wille (1977). From the ultrasound recording, the mean doppler frequencies were calculated each 8 rns through one or a few cardiac cycles as described in Wille (1977).…”

Section: Figures Such As Those Displayed Inmentioning

confidence: 99%

“…of the mean doppler frequency across the vessel lumen) are made from frequency spectra which are calculated from the heterodyne audio output in a computer system (Wille 1977). of the mean doppler frequency across the vessel lumen) are made from frequency spectra which are calculated from the heterodyne audio output in a computer system (Wille 1977).…”

mentioning

confidence: 99%

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Blood flow in arteries determined transcutaneously by an ultrasonic doppler velocitymeter as compared to electromagnetic measurements on the exposed vessels

Guldvog

Kjaernes

Thoresen

et al. 1980

Acta Physiologica Scandinavica

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We have compared the instantaneous mean blood velocity measured transcutaneously from total cross-sections of arteries in dogs by the use of a new pulsed heterodyne ultrasound doppler equipment, with instantaneous blood flow as measured simultaneously by an electromagnetic flowmeter applied on the exposed vessels. The experiments were performed on the common carotid and the femoral arteries in a variety of flow situations, always with a close fit between the two curves. The results show that the output from the ultrasound equipment is proportional to flow.

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Section: The Ultrasound Doppler Velocitymetermentioning

confidence: 99%

Section: The Ultrasound Doppler Velocitymetermentioning

confidence: 99%

Section: Figures Such As Those Displayed Inmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Blood flow in arteries determined transcutaneously by an ultrasonic doppler velocitymeter as compared to electromagnetic measurements on the exposed vessels

Guldvog

Kjaernes

Thoresen

et al. 1980

Acta Physiologica Scandinavica

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show abstract

“…The computer systems for data collection and analysis have been described elsewhere (Hatteland & Eriksen, 1981;Wille, 1977). With the ultrasound transducer we could take measurements on any vessel with an internal diameter greater than 0-1 cm and within the depth range 0-2-2-5 cm, be it located in the neck, face or that part of the brain underlying a fontanelle.…”

Section: Methodsmentioning

confidence: 99%

An evaluation of the plethysmographic method of measuring cranial blood flow in the new‐born infant.

Cowan¹,

Eriksen²,

Thoresen³

1983

The Journal of Physiology

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SUMMARY1. Cranial blood flow values obtained plethysmographically in the human new-born infant have been very variable and frequently very low. We have used a doppler ultrasound velocitymeter and skull compliance measurements to investigate whether the technique itself affects the cranial arterial inflow and whether the methods of calculation used introduce bias.2. Blood velocities were measured in intracranial and extracranial arteries during plethysmography, i.e. before, during and after jugular vein compressions of short duration. Skull expansion after tilting was used to estimate skull compliance.3. In about 10 % of jugular vein compressions, arterial velocities decreased immediately, due to direct pressure on the carotid artery. In the remaining compressions a fall in arterial velocities was seen four or five heartbeats after the onset of the compression. This was probably caused by a decrease in the cranial perfusion pressure consequent on rising venous pressure.4. Some babies demonstrated very poor skull compliance and these babies had correspondingly low estimates of cranial blood flow.5. We conclude that jugular venous occlusion plethysmography is not a suitable method for use in the clinical field and is only useful as a research tool in carefully selected situations.

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Future Directions in Ultrasound Imaging: A Critical Evaluation

Wells

1987

Physics and Engineering of Medical Imaging

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A computer system for on-line decoding of ultrasonic Doppler signals from blood flow measurement

Cited by 27 publications

References 6 publications

Blood flow in arteries determined transcutaneously by an ultrasonic doppler velocitymeter as compared to electromagnetic measurements on the exposed vessels

Blood flow in arteries determined transcutaneously by an ultrasonic doppler velocitymeter as compared to electromagnetic measurements on the exposed vessels

An evaluation of the plethysmographic method of measuring cranial blood flow in the new‐born infant.

Future Directions in Ultrasound Imaging: A Critical Evaluation

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