A5057221880- Traumatic Brain Injury and Neurovascular Disturbances
- Optical Imaging and Spectroscopy Techniques
- Advanced MRI Techniques and Applications
- Enhanced Recovery After Surgery
- Cerebrovascular and Carotid Artery Diseases
- Cardiac and Coronary Surgery Techniques
- Reconstructive Surgery and Microvascular Techniques
University Health Network
2023
University of Toronto
2023
Western University
2014-2015
To establish the accuracy of transcranial Doppler ultrasound (TCD) measures middle cerebral artery (MCA) blood flow velocity (CBFV) as a surrogate (CBF) during hypercapnia (HC) and hypocapnia (HO), we examined whether cross-sectional area (CSA) MCA changed HC or HO TCD-based estimates CBFV were equivalent to from phase contrast (PC) magnetic resonance imaging. CSA was measured 3T images baseline, (hyperventilation at 30 breaths/min), (6% carbon dioxide). PC TCD these protocols on separate...
This study compared changes in cross-sectional area (CSA) and flow (Q) between the middle cerebral artery (MCA) internal carotid (ICA) at baseline during 5 min of hypercapnia (HC; 6% CO2) hypocapnia (HO; hyperventilation) quantified how these contribute to estimates cerebrovascular reactivity (CVR). Measures MCA CSA were made using 3T magnetic resonance imaging. On a separate day, velocity was measured with transcranial Doppler ultrasound ICA diameters duplex ultrasound. Fourteen subjects...
To test the hypothesis that middle cerebral artery (MCA) diameter remains stable across physiologic stimuli, cross‐sectional area (CSA) of MCA was assessed using high‐field magnetic resonance imaging (MRI) (3T, T2 images) during hypercapnia (HC) and hypocapnia (HO). Estimates blood flow velocity (CBV) collected with transcranial Doppler (TCD) ultrasound phase contrast (PC) MRI were also compared subsequent calculation cerebrovascular reactivity (CVR). End‐tidal carbon dioxide (ETCO2) levels...