Matches in SemOpenAlex for { <https://semopenalex.org/work/W3035065934> ?p ?o ?g. }
Showing items 1 to 71 of
71
with 100 items per page.
- W3035065934 abstract "This thesis investigates a novel technique for the quantitative measurement of pulsatile blood flow waveforms and mean blood flow rates using digital X-ray angiographic data. Blood flow waveforms were determined following an intra-arterial injection of contrast material. Instantaneous blood velocities were estimated by generating a 'parametric image' from dynamic X-ray angiographic images in which the image grey-level represented contrast material concentration as a function of time and true distance in three dimensions along a vessel segment. Adjacent concentration-distance profiles in the parametric image of iodine concentration versus distance and time were shifted along the vessel axis until a match occurred. A match was defined as the point where the mean sum of the squares of the differences between the two profiles was a minimum. The distance translated per frame interval gave the instantaneous contrast material bolus velocity. The technique initially was validated using synthetic data from a computer simulation of angiographic data which included the effect of pulsatile blood flow and X-ray quantum noise. The data were generated for a range of vessels from 2 mm to 6 mm in diameter. Different injection techniques and their effects on the accuracy of blood flow measurements were studied. Validation of the technique was performed using an experimental phantom of blood circulation, consisting of a pump, flexible plastic tubing, the tubular probe of an electromagnetic flowmeter and a solenoid to simulate a pulsatile flow waveform which included reverse flow. The technique was validated for both two- and three-dimensional representations of the blood vessel, for various flow rates and calibre sizes. The effects of various physical factors were studied, including the distance between injection and imaging sites and the length of artery analysed. Finally, this method was applied to clinical data from femoral arteries and arteries in the head and neck." @default.
- W3035065934 created "2020-06-19" @default.
- W3035065934 creator A5021230385 @default.
- W3035065934 date "1993-01-01" @default.
- W3035065934 modified "2023-09-24" @default.
- W3035065934 title "The computation of blood flow waveforms from digital X-ray angiographic data" @default.
- W3035065934 hasPublicationYear "1993" @default.
- W3035065934 type Work @default.
- W3035065934 sameAs 3035065934 @default.
- W3035065934 citedByCount "0" @default.
- W3035065934 crossrefType "dissertation" @default.
- W3035065934 hasAuthorship W3035065934A5021230385 @default.
- W3035065934 hasConcept C104293457 @default.
- W3035065934 hasConcept C105795698 @default.
- W3035065934 hasConcept C117251300 @default.
- W3035065934 hasConcept C120665830 @default.
- W3035065934 hasConcept C121332964 @default.
- W3035065934 hasConcept C126838900 @default.
- W3035065934 hasConcept C136229726 @default.
- W3035065934 hasConcept C158846371 @default.
- W3035065934 hasConcept C164705383 @default.
- W3035065934 hasConcept C165801399 @default.
- W3035065934 hasConcept C192562407 @default.
- W3035065934 hasConcept C197424946 @default.
- W3035065934 hasConcept C33923547 @default.
- W3035065934 hasConcept C62520636 @default.
- W3035065934 hasConcept C71924100 @default.
- W3035065934 hasConcept C79191276 @default.
- W3035065934 hasConceptScore W3035065934C104293457 @default.
- W3035065934 hasConceptScore W3035065934C105795698 @default.
- W3035065934 hasConceptScore W3035065934C117251300 @default.
- W3035065934 hasConceptScore W3035065934C120665830 @default.
- W3035065934 hasConceptScore W3035065934C121332964 @default.
- W3035065934 hasConceptScore W3035065934C126838900 @default.
- W3035065934 hasConceptScore W3035065934C136229726 @default.
- W3035065934 hasConceptScore W3035065934C158846371 @default.
- W3035065934 hasConceptScore W3035065934C164705383 @default.
- W3035065934 hasConceptScore W3035065934C165801399 @default.
- W3035065934 hasConceptScore W3035065934C192562407 @default.
- W3035065934 hasConceptScore W3035065934C197424946 @default.
- W3035065934 hasConceptScore W3035065934C33923547 @default.
- W3035065934 hasConceptScore W3035065934C62520636 @default.
- W3035065934 hasConceptScore W3035065934C71924100 @default.
- W3035065934 hasConceptScore W3035065934C79191276 @default.
- W3035065934 hasLocation W30350659341 @default.
- W3035065934 hasOpenAccess W3035065934 @default.
- W3035065934 hasPrimaryLocation W30350659341 @default.
- W3035065934 hasRelatedWork W179481477 @default.
- W3035065934 hasRelatedWork W1967532890 @default.
- W3035065934 hasRelatedWork W1978662097 @default.
- W3035065934 hasRelatedWork W2004151049 @default.
- W3035065934 hasRelatedWork W2011125887 @default.
- W3035065934 hasRelatedWork W2016230276 @default.
- W3035065934 hasRelatedWork W2029167237 @default.
- W3035065934 hasRelatedWork W2038319932 @default.
- W3035065934 hasRelatedWork W203953886 @default.
- W3035065934 hasRelatedWork W2046604363 @default.
- W3035065934 hasRelatedWork W2060852674 @default.
- W3035065934 hasRelatedWork W2062752932 @default.
- W3035065934 hasRelatedWork W2079031111 @default.
- W3035065934 hasRelatedWork W2096443125 @default.
- W3035065934 hasRelatedWork W2137493737 @default.
- W3035065934 hasRelatedWork W2371579630 @default.
- W3035065934 hasRelatedWork W2395420142 @default.
- W3035065934 hasRelatedWork W420009968 @default.
- W3035065934 hasRelatedWork W1599512293 @default.
- W3035065934 hasRelatedWork W2189417319 @default.
- W3035065934 isParatext "false" @default.
- W3035065934 isRetracted "false" @default.
- W3035065934 magId "3035065934" @default.
- W3035065934 workType "dissertation" @default.