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J

Joseph A. Fisher

university of toronto

54H-index
361Paper Count
9.7KCitation Count
Published Papers 112
Publication Date
Persistent Steal Physiology during a Ramp Cerebrovascular Reactivity Assessment Correlates with Severe Cortical Thinning in Steno-Occlusive Disease
err2026-04-01
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PREAI
errShi, Runjie Bill; Poublanc, Julien; Sayin, Ece Su; Sobczyk, Olivia; Fisher, Joseph A.; Mikulis, David J.; Para, Andrea E.
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Quantifying Myocardial Perfusion without Exogenous Contrast Agents Through Arterial Oxygen Tension Modulation
err2026-01-28
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errOAAI
errYuheng Huang; Hsin-Jung Yang; Xinheng Zhang; Benjamin Wilk; Rafay Khan; Tameshwar Ganesh; Olivia Sobczyk; Jane Sykes; Heather Biernaski; Frank Prato; Joseph Fisher; Rohan Dharmakumar
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Cerebrovascular reactivity differences in healthy cerebral gray and white matter
err2025-04-06
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errOAAI
errLevine, Harrison T.; Poublanc, Julien; Sayin, Ece Su; Duffin, James; Sobczyk, Olivia; Fisher, Joseph A.; Mikulis, David J.
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A NOVEL APPROACH TO PERFUSION MRI STUDIES IN BRAIN TUMOR PATIENTS USING ENDOGENOUS DEOXYHEMOGLOBIN AS A CONTRAST AGENT: A PROOF-OF-CONCEPT STUDY
err2024-11-11
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PREAI
errStumpo, Vittorio; Sayin, Ece Su; Bellomo, Jacopo; Sobczyk, Oliva; van Niftrik, Christiaan Hendrik Bas; Sebok, Martina; Weller, Michael; Regli, Luca; Kulcsar, Zsolt; Pangalu, Athina; Bink, Andrea; Duffin, James; Mikulis, David D.; Fisher, Joseph A.; Fierstra, Jorn
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Cerebral perfusion metrics calculated directly from a hypoxia-induced step change in deoxyhemoglobin
err2024-07-25
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errOAAI
errDuffin, James; Sayin, Ece Su; Sobczyk, Olivia; Poublanc, Julien; Mikulis, David J.; Fisher, Joseph A.
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Transient deoxyhemoglobin formation as a contrast for perfusion MRI studies in patients with brain tumors: a feasibility study
err2024-04-25
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errOAAI
errStumpo, Vittorio; Sayin, Ece Su; Bellomo, Jacopo; Sobczyk, Olivia; van Niftrik, Christiaan Hendrik Bas; Sebok, Martina; Weller, Michael; Regli, Luca; Kulcsar, Zsolt; Pangalu, Athina; Bink, Andrea; Duffin, James; Mikulis, David D.; Fisher, Joseph A.; Fierstra, Jorn
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Increased Risk of Recurrent Stroke in Symptomatic Large Vessel Disease With Impaired BOLD Cerebrovascular Reactivity
errSTROKE
IF8.9
err2024-03-01
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PREAI
errvan Niftrik, Christiaan H. B.; Sebok, Martina; Germans, Menno R.; Halter, Matthias; Pokorny, Thomas; Stumpo, Vittorio; Bellomo, Jacopo; Piccirelli, Marco; Pangalu, Athina; Katan, Mira; Wegener, Susanne; Tymianski, Michael; Kulcsar, Zsolt; Luft, Andreas R.; Fisher, Joseph A.; Mikulis, David J.; Regli, Luca; Fierstra, Jorn
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The Choroid Plexus as an Alternative Locus for the Identification of the Arterial Input Function for Calculating Cerebral Perfusion Metrics Using MRI
err2023-12-28
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errOAAI
errSobczyk, Olivia; Sayin, Ece Su; Poublanc, Julien; Duffin, James; Para, Andrea; Fisher, Joseph A.; Mikulis, David J.
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Assessment of Cerebrovascular Reactivity Using CO2-BOLD MRI: A 15-Year, Single Center Experience
err2023-12-22
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errOAAI
errRaghavan, Vishvak; Sobczyk, Olivia; Sayin, Ece Su; Poublanc, Julien; Skanda, Abby; Duffin, James; Venkatraghavan, Lashmi; Fisher, Joseph A.; Mikulis, David J.
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Assessing Perfusion in Steno-Occlusive Cerebrovascular Disease Using Transient Hypoxia-Induced Deoxyhemoglobin as a Dynamic Susceptibility Contrast Agent
err2023-12-21
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errOAAI
errSayin, Ece Su; Duffin, James; Stumpo, Vittorio; Bellomo, Jacopo; Piccirelli, Marco; Poublanc, Julien; Wijeya, Vepeson; Para, Andrea; Pangalu, Athina; Bink, Andrea; Nemeth, Bence; Kulcsar, Zsolt; Mikulis, David J.; Fisher, Joseph A.; Sobczyk, Olivia; Fierstra, Jorn
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Hemodynamic Failure Staging With Blood Oxygenation Level- Dependent Cerebrovascular Reactivity and Acetazolamide- Challenged (15O-)H2O- Positron Emission Tomography Across Individual Cerebrovascular Territories
err2023-12-19
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errOAAI
errSeboek, Martina; van der Wouden, Frank; Mader, Caecilia; Pangalu, Athina; Treyer, Valerie; Fisher, Joseph Arnold; Mikulis, David John; Huellner, Martin; Regli, Luca; Fierstra, Jorn; van Niftrik, Christiaan Hendrik Bas
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Determining the effects of elevated partial pressure of oxygen on hypercapnia-induced cerebrovascular reactivity
err2023-08-26
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errOAAI
errSayin, Ece Su; Duffin, James; Poublanc, Julien; Venkatraghavan, Lashmikumar; Mikulis, David John; Fisher, Joseph Arnold; Sobczyk, Olivia
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Transfer function analysis assesses resting cerebral perfusion metrics using hypoxia-induced deoxyhemoglobin as a contrast agent
err2023-05-03
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errOAAI
errSayin, Ece Su; Sobczyk, Olivia; Poublanc, Julien; Mikulis, David J.; Fisher, Joseph A.; Duffin, James
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Investigations of hypoxia-induced deoxyhemoglobin as a contrast agent for cerebral perfusion imaging
err2022-10-29
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errOAAI
errSayin, Ece Su; Schulman, Jacob; Poublanc, Julien; Levine, Harrison T.; Raghavan, Lakshmikumar Venkat; Uludag, Kamil; Duffin, James; Fisher, Joseph A.; Mikulis, David J.; Sobczyk, Olivia
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Sickle cell cerebrovascular reactivity to a CO2 stimulus: Too little, too slow
err2022-08-19
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errOAAI
errForte, Stephanie; Sobczyk, Olivia; Poublanc, Julien; Duffin, James; Hare, Gregory M. T.; Fisher, Joseph Arnold; Mikulis, David; Kuo, Kevin H. M.
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Assessing Cerebrovascular Resistance in Patients With Sickle Cell Disease
err2022-03-29
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errOAAI
errSayin, Ece Su; Sobczyk, Olivia; Poublanc, Julien; Mikulis, David J.; Fisher, Joseph A.; Kuo, Kevin H. M.; Duffin, James
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Effect of a neck collar on brain turgor: a potential role in preventing concussions?
err2021-11-25
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errOAAI
errDinsmore, Michael; Hajat, Zakir; Brenna, Connor T. A.; Fisher, Joseph; Venkatraghavan, Lashmi
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Perfusion MRI using endogenous deoxyhemoglobin as a contrast agent: Preliminary data
err2021-10-22
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errOAAI
errPoublanc, Julien; Sobczyk, Olivia; Shafi, Reema; Sayin, Ece Su; Schulman, Jacob; Duffin, James; Uludag, Kamil; Wood, John C.; Vu, Chau; Dharmakumar, Rohan; Fisher, Joseph A.; Mikulis, David J.
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Measuring Cerebrovascular Reactivity: Sixteen Avoidable Pitfalls
err2021-07-07
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errOAAI
errSobczyk, Olivia; Fierstra, Jorn; Venkatraghavan, Lakshmikumar; Poublanc, Julien; Duffin, James; Fisher, Joseph A.; Mikulis, David J.
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Normal BOLD Response to a Step CO2 Stimulus After Correction for Partial Volume Averaging
err2021-06-14
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errOAAI
errPoublanc, Julien; Shafi, Reema; Sobczyk, Olivia; Sam, Kevin; Mandell, Daniel M.; Venkatraghavan, Lakshmikumar; Duffin, James; Fisher, Joseph A.; Mikulis, David J.
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