A
A. Waaijer
Researcher at Utrecht University
Publications - 18
Citations - 1972
A. Waaijer is an academic researcher from Utrecht University. The author has contributed to research in topics: Perfusion scanning & Cerebral perfusion pressure. The author has an hindex of 12, co-authored 18 publications receiving 1855 citations. Previous affiliations of A. Waaijer include University Medical Center Utrecht.
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Journal ArticleDOI
Perfusion-CT Assessment of Infarct Core and Penumbra Receiver Operating Characteristic Curve Analysis in 130 Patients Suspected of Acute Hemispheric Stroke
Max Wintermark,Adam E. Flanders,Birgitta K. Velthuis,Reto Meuli,Maarten S. van Leeuwen,Dorit Goldsher,Carissa Pineda,Joaquín Serena,Irene C. van der Schaaf,A. Waaijer,James C. Anderson,Gary M. Nesbit,Igal Gabriely,Victoria Medina,Ana Quiles,Scott Pohlman,Scott Pohlman,Marcel Quist,Pierre Schnyder,Julien Bogousslavsky,William P. Dillon,Salvador Pedraza,Salvador Pedraza +22 more
TL;DR: In a large series of 130 patients, the optimal approach to define the infarct and the penumbra is a combined approach using 2 PCT parameters: relative MTT and absolute CBV, with dedicated thresholds.
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New ischaemic brain lesions on MRI after stenting or endarterectomy for symptomatic carotid stenosis: a substudy of the International Carotid Stenting Study (ICSS)
Leo H. Bonati,Leo H. Bonati,Lisa M. Jongen,Sven Haller,H. Zwenneke Flach,Joanna Dobson,Paul J. Nederkoorn,Sumaira Macdonald,Peter Gaines,A. Waaijer,Peter Stierli,H. Rolf Jäger,Philippe Lyrer,L. Jaap Kappelle,Stephan G. Wetzel,Aad van der Lugt,Willem P.Th.M. Mali,Martin M. Brown,H. Bart van der Worp,Stefan T. Engelter +19 more
TL;DR: About three times more patients in the stenting group than in the endarterectomy group had new ischaemic lesions on DWI on post-treatment scans, suggesting DWI might serve as a surrogate outcome measure in future trials of carotid interventions.
Journal ArticleDOI
Circle of Willis at CT Angiography: Dose Reduction and Image Quality—Reducing Tube Voltage and Increasing Tube Current Settings
A. Waaijer,Mathias Prokop,Birgitta K. Velthuis,Chris J.G. Bakker,Gerard A. P. de Kort,Maarten S. van Leeuwen +5 more
TL;DR: In head phantoms, lower tube voltage improved SNR at equal radiation doses translated into superior image quality at 90 kVp for CT angiography of the circle of Willis.
Journal ArticleDOI
Waiting times for radiotherapy: consequences of volume increase for the TCP in oropharyngeal carcinoma
A. Waaijer,Chris H.J. Terhaard,Human Dehnad,G. J. Hordijk,Maarten S. van Leeuwen,Cornelius P.J. Raaymakers,Jan J W Lagendijk +6 more
TL;DR: This study shows tumour progression during the time between the diagnostic CT scan and the treatment planning CT scan in oropharyngeal cancer, which allows tumour volume increase, and there may be an average control loss of 16-19 % for these tumours during the total waiting time before radiotherapy.
Journal ArticleDOI
Changes in Cerebral Perfusion after Revascularization of Symptomatic Carotid Artery Stenosis: CT Measurement
A. Waaijer,Maarten S. van Leeuwen,Matthias J.P. van Osch,Bart van der Worp,Frans L. Moll,Rob T.H. Lo,Willem P.Th.M. Mali,Mathias Prokop +7 more
TL;DR: Compared with relative CT perfusion values based on interhemispheric comparison, absolute perfusion CT values are less suited for demonstrating changes in cerebral perfusion after revascularization in patients with unilateral symptomatic carotid artery stenosis.