Flow and peak velocity measurements in patients with aortic valve stenosis using phase contrast MR accelerated with k-t BLAST

Thunberg, Per,1968-Department of Medical Physics, Örebro University Hospital, Örebro, Sweden (author)

Funding agency:Research Committee of Örebro County Council
Objective: To investigate the accuracy of velocity measurements in patients with aortic valve stenosis using phase contrast (PC) imaging accelerated with SENSE (Sensitivity Encoding) and k-t BLAST (Broad-use Linear Acquisition Speed-up Technique).Methods: Accelerated quantitative breath hold PC measurements, using SENSE and k-t BLAST, were performed in twelve patients whose aortic valve stenosis had been initially diagnosed using echocardiography. Stroke volume (SV) and peak velocity measurements were performed on each subject in three adjacent slices using both accelerating methods.Results: The peak velocities measured with PC MRI using SENSE were -8.0±9.5% lower (p<0.01) compared to the peak velocities measured with k-t BLAST and the correlation was r=0.83. The stroke volumes when using SENSE were slightly higher 0.4±17.1 ml compared to the SV obtained using k-t BLAST but the difference was not significant (p>0.05).Conclusions In this study higher peak velocities were measured in patients with aortic stenosis when combining k-t BLAST with PC MRI compared to PC MRI using SENSE. A probable explanation of this difference is the higher temporal resolution achieved in the k-t BLAST measurement. There was, however, no significant difference between calculated SV based on PC MRI using SENSE and k-t BLAST, respectively.

Emilsson, Kent,1963-Department of Clinical Physiology, Örebro University Hospital, Örebro, Sweden(Swepub:oru)kten (author)
Rask, PeterDepartment of Clinical Physiology, Örebro University Hospital, Örebro, Sweden(Swepub:oru)prk (author)
Kähäri, AndersDepartment of Radiology, Örebro University Hospital, Örebro, Sweden (author)
Department of Medical Physics, Örebro University Hospital, Örebro, SwedenDepartment of Clinical Physiology, Örebro University Hospital, Örebro, Sweden (creator_code:org_t)

In:European Journal of RadiologyClare, Ireland : Elsevier81:9, s. 2203-22070720-048X1872-7727

By the author/editor: Thunberg, Per, 1 ...; Emilsson, Kent, ...; Rask, Peter; Kähäri, Anders

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Radiology Nuclea ...

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