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A combined ultrasonic linear array scanner and pulsed Doppler velocimeter for the estimation of blood flow in the foetus and adult abdomen--I: Technical aspects |
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| Authors: | M J Teague K Willson C K Battye M G Taylor D R Griffin S Campbell V C Roberts |
| Affiliation: | 1. Department of Obstetrics and Gynaecology, King''s College Hospital Medical School, London, S.E.5.; England;2. Department of Medical Physics, King''s College Hospital; London, S.E.5.; England;3. Department of Physics, Guy''s Hospital Medical School; London, S.E.5.; England;4. Biomedical Engineering Department, King''s College Hospital Medical School, London, S.E.5.; England |
| Abstract: | A method is proposed for estimating the volume blood flow of deep lying vessels in the foetus and in adult portal vein and renal vessels. The equipment combines a 3.5 MHz linear array scanner with a 2 or 4 MHz pulsed Doppler. The pulsed Doppler tranducer is connected to the linear array by two movable arms. A real time spectrum analyser is used to process the Doppler signals. A water bath was used to perform an in vitro calibration of the complete system and to adjust the registration of the Doppler sample volume with the echo picture. Several possible inaccuracies in vessel diameter measurement are discussed and the mean of several caliper measurements described by Eik-Ness (1982) is used. Time Motion is thought to be the better method but is more complicated in practice. |
| Keywords: | Doppler ultrasound Spectral analysis Duplex scanner |
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