scholarly journals Reproducibility of total cerebral blood flow measurements using phase contrast magnetic resonance imaging

2002 ◽  
Vol 16 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Aart Spilt ◽  
Frieke M.A. Box ◽  
Rob J. van der Geest ◽  
Johan H.C. Reiber ◽  
Patrik Kunz ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Magnetic Resonance ◽  
Phase Contrast ◽  
Resonance Imaging ◽  
Flow Measurements ◽  
Phase Contrast Magnetic Resonance ◽  
Contrast Magnetic Resonance ◽  
Blood Flow Measurements

Numerical and Experimental Study of a Novel Phase Contrast Technique: Self Reference Phase-Contrast Magnetic Resonance Imaging

2007 ◽  
Author(s):  
Longchuan Li ◽  
Mark Doyle ◽  
Geetha Rayarao ◽  
Eduardo Kortright ◽  
Andreas S. Anayiotos
Keyword(s):  
Magnetic Resonance Imaging ◽  
Blood Flow ◽  
Magnetic Resonance ◽  
Phase Contrast ◽  
Resonance Imaging ◽  
Paired Data ◽  
Flow Measurements ◽  
Phase Contrast Magnetic Resonance ◽  
Contrast Magnetic Resonance ◽  
Self Reference

The quantitative measurement of blood flow using magnetic resonance imaging (MRI) has been a topic of research for over twenty years. At present, blood flow measurements are largely performed using two-dimensional phase contrast magnetic resonance (PC-MR). However, when high acceleration terms are present (i.e., valve regurgitation or stenosis), accuracy of conventional (Con) cardiac PC-MR can suffer: when data are acquired at a relatively poor temporal resolution, the data extraction process, which essentially is one of comparison, makes the Con PC-MR data sensitive to temporal acceleration. Here, a novel PC-MR technique termed Self Reference (SR) PC-MR is introduced that overcomes these limitations by eliminating the need for comparing paired data sets.

scholarly journals Improved brain perfusion after electrical cardioversion of atrial fibrillation

EP Europace ◽  
2019 ◽  
Vol 22 (4) ◽  
pp. 530-537 ◽  
Author(s):  
Marianna Gardarsdottir ◽  
Sigurdur Sigurdsson ◽  
Thor Aspelund ◽  
Valdis Anna Gardarsdottir ◽  
Lars Forsberg ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Atrial Fibrillation ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Magnetic Resonance ◽  
Brain Perfusion ◽  
Resonance Imaging ◽  
Flow Measurements ◽  
Before And After ◽  
Blood Flow Measurements

Abstract Aims Atrial fibrillation (AF) has been associated with reduced brain volume, cognitive impairment, and reduced cerebral blood flow. The causes of reduced cerebral blood flow in AF are unknown, but no reduction was seen in individuals without the arrhythmia in a previous study. The aim of this study was to test the hypothesis that brain perfusion, measured with magnetic resonance imaging (MRI), improves after cardioversion of AF to sinus rhythm (SR). Methods and results All patients undergoing elective cardioversion at our institution were invited to participate. A total of 44 individuals were included. Magnetic resonance imaging studies were done before and after cardioversion with both brain perfusion and cerebral blood flow measurements. However, 17 did not complete the second MRI as they had a recurrence of AF during the observation period (recurrent AF group), leaving 17 in the SR group and 10 in the AF group to complete both measurements. Brain perfusion increased after cardioversion to SR by 4.9 mL/100 g/min in the whole brain (P < 0.001) and by 5.6 mL/100 g/min in grey matter (P < 0.001). Cerebral blood flow increased by 58.6 mL/min (P < 0.05). Both brain perfusion and cerebral blood flow remained unchanged when cardioversion was unsuccessful. Conclusion In this study of individuals undergoing elective cardioversion for AF, restoration, and maintenance of SR for at least 10 weeks after was associated with an improvement of brain perfusion and cerebral blood flow measured by both arterial spin labelling and phase contrast MRI. In those individuals where cardioversion was unsuccessful, there was no change in perfusion or blood flow.

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