Document Detail


Evaluation of flow measurement from the first pass bolus T1 weighted images using inversion recovery sequence.
MedLine Citation:
PMID:  20959366     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Previous studies have shown that the organ blood flows (OBFs) calculated using the T(1) weighted MRI technique were lower than the expected values. The aim of this study was a flow measurement comparison between the theoretical and experimental flows based on the technique before and after corrections (coil non-uniformity and inflow) using a flow phantom at two different concentrations (0.8 and 1.2 mmol l(-1)).
METHODS: A flow phantom was designed to produce three different flow rates at the same time. Theoretical flow was calculated by measuring the volumes of the phantom and dividing them by the time taken to fill these volumes. T(1) weighted turbo fast low-angle shot images were used to measure signal intensity (SI) change during the first bolus passage of the contrast medium through the phantom using linear phase-encoding acquisition.
RESULTS: The corrected experimental flow based on the technique shows a good agreement with the theoretical flow, where the flow rate is low at the two concentrations.
CONCLUSION: The T(1) weighted MRI technique after the two correction factors can be used to measure the absolute flow where the flow rate is low, such as in the capillaries. For measuring high flow rate (e.g. artery), additional correction factors should be considered.
Authors:
M Nazarpoor
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Publication Detail:
Type:  Evaluation Studies; Journal Article     Date:  2010-10-19
Journal Detail:
Title:  The British journal of radiology     Volume:  84     ISSN:  1748-880X     ISO Abbreviation:  Br J Radiol     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-03-18     Completed Date:  2011-05-23     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  0373125     Medline TA:  Br J Radiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  342-9     Citation Subset:  AIM; IM    
Affiliation:
Department of Radiology, Paramedical School, University of Tabriz Medical Sciences, Tabriz, Iran. nazarpoorm@tbzmed.ac.ir
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Blood Flow Velocity / physiology
Brain / blood supply*,  physiology
Cerebrovascular Circulation / physiology*
Contrast Media / diagnostic use
Humans
Image Processing, Computer-Assisted
Magnetic Resonance Imaging / instrumentation,  methods*
Phantoms, Imaging
Reproducibility of Results
Chemical
Reg. No./Substance:
0/Contrast Media
Comments/Corrections

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