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BibTeX
Variable velocity encoding in a three-dimensional, three-directional phase contrast sequence: Evaluation in phantom and volunteers
Journal of magnetic resonance imaging, 2012-12, Vol.36 (6), p.1450-1459
Nilsson, Anders
Bloch, Karin Markenroth
Carlsson, Marcus
Heiberg, Einar
Ståhlberg, Freddy
2012
Details
Autor(en) / Beteiligte
Nilsson, Anders
Bloch, Karin Markenroth
Carlsson, Marcus
Heiberg, Einar
Ståhlberg, Freddy
Titel
Variable velocity encoding in a three-dimensional, three-directional phase contrast sequence: Evaluation in phantom and volunteers
Ist Teil von
Journal of magnetic resonance imaging, 2012-12, Vol.36 (6), p.1450-1459
Ort / Verlag
Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
Purpose: To evaluate accuracy and noise properties of a novel time‐resolved, three‐dimensional, three‐directional phase contrast sequence with variable velocity encoding (denoted 4D‐vPC) on a 3 Tesla MR system, and to investigate potential benefits and limitations of variable velocity encoding with respect to depicting blood flow patterns. Materials and Methods: A 4D PC‐MRI sequence was modified to allow variable velocity encoding (VENC) over the cardiac cycle in all three velocity directions independently. 4D‐PC sequences with constant and variable VENC were compared in a rotating phantom with respect to measured velocities and noise levels. Additionally, comparison of flow patterns in the ascending aorta was performed in six healthy volunteers. Results: Phantom measurements showed a linear relationship between velocity noise and velocity encoding. 4D‐vPC MRI presented lower noise levels than 4D‐PC both in phantom and in volunteer measurements, in agreement with theory. Volunteer comparisons revealed more consistent and detailed flow patterns in early diastole for the variable VENC sequences. Conclusion: Variable velocity encoding offers reduced noise levels compared with sequences with constant velocity encoding by optimizing the velocity‐to‐noise ratio (VNR) to the hemodynamic properties of the imaged area. Increased VNR ratios could be beneficial for blood flow visualizations of pathology in the cardiac cycle. J. Magn. Reson. Imaging 2012; 36:1450–1459. © 2012 Wiley Periodicals, Inc.
Sprache
Englisch
Identifikatoren
ISSN: 1053-1807, 1522-2586
eISSN: 1522-2586
DOI: 10.1002/jmri.23778
Titel-ID: cdi_swepub_primary_oai_lup_lub_lu_se_eb2b6d16_6bb3_4079_a26d_2aab3dee47a6
Format
–
Schlagworte
Adult
,
Algorithms
,
Blood Flow Velocity
,
blood flow visualization
,
Brain - anatomy & histology
,
Brain - physiology
,
Cardiac-Gated Imaging Techniques - methods
,
Cerebral Arteries - physiology
,
Cerebrovascular Circulation
,
Clinical Medicine
,
Female
,
flow MRI
,
Humans
,
Image Enhancement - methods
,
Image Interpretation, Computer-Assisted - methods
,
Imaging, Three-Dimensional - methods
,
Klinisk medicin
,
Magnetic Resonance Angiography - methods
,
Magnetic resonance imaging
,
Male
,
Medical and Health Sciences
,
Medicin och hälsovetenskap
,
Phantoms, Imaging
,
phase contrast magnetic resonance imaging
,
Radiologi och bildbehandling
,
Radiology, Nuclear Medicine and Medical Imaging
,
Reproducibility of Results
,
Sensitivity and Specificity
,
velocity encoding
,
velocity mapping
,
Young Adult
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