The Effect of Doppler Phenomenon on the Speed of Blood Flow

This research studying the phenomenon of Doppler (frequency Doppler) as a method through which the direction and speed of the blood cells flows in blood vessels wear measured. This Doppler frequency is relied upon in medicine for measuring the speed of blood flow, because the blood flow is an import...

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Autor principal: Ghaidaa Abdulrahman Khalid
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Publicado: Al-Khwarizmi College of Engineering – University of Baghdad 2012
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Acceso en línea:https://doaj.org/article/4b11d495ad5d4b6b90fee8fb180f569e
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spelling oai:doaj.org-article:4b11d495ad5d4b6b90fee8fb180f569e2021-12-02T07:14:47ZThe Effect of Doppler Phenomenon on the Speed of Blood Flow1818-1171https://doaj.org/article/4b11d495ad5d4b6b90fee8fb180f569e2012-01-01T00:00:00Zhttp://www.iasj.net/iasj?func=fulltext&aId=64557https://doaj.org/toc/1818-1171This research studying the phenomenon of Doppler (frequency Doppler) as a method through which the direction and speed of the blood cells flows in blood vessels wear measured. This Doppler frequency is relied upon in medicine for measuring the speed of blood flow, because the blood flow is an important concept from the concepts of medicine. It represents the function and efficient of the heart and blood vessels in the body so any defect in this function will appear as a change in the speed of blood flow from the normal value assumed. As this speed changes alot in cases of disease and morbidity of the heart, so in order to identify the effect of changing the Doppler frequency on the speed of blood flow and the relationship of this frequency with the angles of transitions and receptions and the effect of changing the ultrasound transmitted frequencies on the measured velocities .The Doppler ultrasound system has been used which is more efficient and easier to be widely used as a practical application in Al Yarmouk Teaching Hospital on two subjects. The normal had a natural medical history in the blood vessels, and abnormal had carotid artery stenosis. This device will give the flow velocity of blood in the blood vessels which is useful to the examiner, the equation of Doppler as a mathematical model in the research is adopted the measured speed to clarify the amount of change in the frequency (shift in frequency). This speed was measured in five different blood vessels, large arteries (abdominal aorta and carotid artery in the neck) and large veins (the inferior vena cava across the abdomen and the external Jugular vein in the neck) and capillaries in the hand and fingers. Then using the measured velocities in these vessels the Doppler frequency was calculated from this mathematical model using MATLAB program, was found that as velocity of the blood increases, so does the Doppler frequency and vice versa. The greater the value of the Doppler angle used in the device then the Doppler frequency decreased and vice versa. As well as increasing the transmitted frequency giving an increase in the speed of blood flow and in the Doppler frequency and vice versa. It was observed during the practical work that it was possible to get the speed of blood flow in different blood vessels, arteries and veins easily, but to less extent in the capillary vessels since in fact the value of the received frequency was very small.Ghaidaa Abdulrahman KhalidAl-Khwarizmi College of Engineering – University of BaghdadarticleDoppler frequencyblood flowultrasonic blood flow meter.Chemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 8, Iss 4, Pp 26-39 (2012)
institution DOAJ
collection DOAJ
language EN
topic Doppler frequency
blood flow
ultrasonic blood flow meter.
Chemical engineering
TP155-156
Engineering (General). Civil engineering (General)
TA1-2040
spellingShingle Doppler frequency
blood flow
ultrasonic blood flow meter.
Chemical engineering
TP155-156
Engineering (General). Civil engineering (General)
TA1-2040
Ghaidaa Abdulrahman Khalid
The Effect of Doppler Phenomenon on the Speed of Blood Flow
description This research studying the phenomenon of Doppler (frequency Doppler) as a method through which the direction and speed of the blood cells flows in blood vessels wear measured. This Doppler frequency is relied upon in medicine for measuring the speed of blood flow, because the blood flow is an important concept from the concepts of medicine. It represents the function and efficient of the heart and blood vessels in the body so any defect in this function will appear as a change in the speed of blood flow from the normal value assumed. As this speed changes alot in cases of disease and morbidity of the heart, so in order to identify the effect of changing the Doppler frequency on the speed of blood flow and the relationship of this frequency with the angles of transitions and receptions and the effect of changing the ultrasound transmitted frequencies on the measured velocities .The Doppler ultrasound system has been used which is more efficient and easier to be widely used as a practical application in Al Yarmouk Teaching Hospital on two subjects. The normal had a natural medical history in the blood vessels, and abnormal had carotid artery stenosis. This device will give the flow velocity of blood in the blood vessels which is useful to the examiner, the equation of Doppler as a mathematical model in the research is adopted the measured speed to clarify the amount of change in the frequency (shift in frequency). This speed was measured in five different blood vessels, large arteries (abdominal aorta and carotid artery in the neck) and large veins (the inferior vena cava across the abdomen and the external Jugular vein in the neck) and capillaries in the hand and fingers. Then using the measured velocities in these vessels the Doppler frequency was calculated from this mathematical model using MATLAB program, was found that as velocity of the blood increases, so does the Doppler frequency and vice versa. The greater the value of the Doppler angle used in the device then the Doppler frequency decreased and vice versa. As well as increasing the transmitted frequency giving an increase in the speed of blood flow and in the Doppler frequency and vice versa. It was observed during the practical work that it was possible to get the speed of blood flow in different blood vessels, arteries and veins easily, but to less extent in the capillary vessels since in fact the value of the received frequency was very small.
format article
author Ghaidaa Abdulrahman Khalid
author_facet Ghaidaa Abdulrahman Khalid
author_sort Ghaidaa Abdulrahman Khalid
title The Effect of Doppler Phenomenon on the Speed of Blood Flow
title_short The Effect of Doppler Phenomenon on the Speed of Blood Flow
title_full The Effect of Doppler Phenomenon on the Speed of Blood Flow
title_fullStr The Effect of Doppler Phenomenon on the Speed of Blood Flow
title_full_unstemmed The Effect of Doppler Phenomenon on the Speed of Blood Flow
title_sort effect of doppler phenomenon on the speed of blood flow
publisher Al-Khwarizmi College of Engineering – University of Baghdad
publishDate 2012
url https://doaj.org/article/4b11d495ad5d4b6b90fee8fb180f569e
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