Evaluation of measurements of pulsating flow under controlled conditions using phase contrast MRI
Independent thesis Basic level (professional degree), 20 credits / 30 HE creditsStudent thesis
The accuracy and precision of measurements of pulsating flow obtained with phase contrast magnetic resonance imaging (PC MRI) was studied. Measurements were carried out using known flow rates through a phantom connected to a pump that created pulsation in the flow. Repeated measurements were made in both the negative and positive encoding direction, using both breath-hold and non breath hold sequences. The obtained data was analyzed using code written in MATLAB and also using the FLOW software that is offered by the manufacturer of the MRI system.
A range of different flow velocities was scanned, and results show that the overall accuracy of the measurements is relatively good, with an average error of between 1.2% to 5.7% using the clinically employed flow calculation software. There is however indication of a systematic phase offset in the data that influences the measurements. The effect of the offset on the results depends on the direction of flow and the sequence used. The results also show the importance of properly selecting the area over which the flow rate is calculated.
Place, publisher, year, edition, pages
2006. , 53 p.
Phase contrast MRI, FLOW, flow rate
Radiology, Nuclear Medicine and Medical Imaging
IdentifiersURN: urn:nbn:se:su:diva-7222OAI: oai:DiVA.org:su-7222DiVA: diva2:197883
Nordell, Bo, Fil Dr
Nilsson, Bo, Docent