Relative cerebral blood volume values to differentiate high-grade glioma recurrence from posttreatment radiation effect: direct correlation between image-guided …

…, KA Smith, BG Feuerstein, JP Karis… - American Journal …, 2009 - Am Soc Neuroradiology
BACKGROUND AND PURPOSE: Differentiating tumor growth from posttreatment radiation
effect (PTRE) remains a common problem in neuro-oncology practice. To our knowledge, …

Rapid calculation of T1 using variable flip angle gradient refocused imaging

…, RJ Herfkens, GA Johnson, GH Glover, JP Karis… - Magnetic resonance …, 1987 - Elsevier
We present a method for rapid measurement of T1 relaxation times using gradient refocused
images at limited flip angles and short repetition times. This “variable nutation” techniques …

Differentiating recurrent tumor from radiation necrosis: time for re-evaluation of positron emission tomography?

PE Ricci, JP Karis, JE Heiserman… - American Journal …, 1998 - Am Soc Neuroradiology
UNLABELLED Our purpose was to evaluate the ability of FDG PET to differentiate recurrent
tumor from posttherapy radiation necrosis. METHODS MR images, PET scans, and medical …

Noninvasive imaging of treated cerebral aneurysms, part I: MR angiographic follow-up of coiled aneurysms

RC Wallace, JP Karis, S Partovi… - American Journal of …, 2007 - Am Soc Neuroradiology
MRA is emerging as an alternative to conventional catheter based angiography for the
assessment of aneurysms after endovascular treatment. Short TE and contrast enhanced MRA …

Reevaluating the imaging definition of tumor progression: perfusion MRI quantifies recurrent glioblastoma tumor fraction, pseudoprogression, and radiation necrosis to …

…, AC Dueck, WR Shapiro, S Liu, JP Karis… - Neuro …, 2012 - academic.oup.com
INTRODUCTION: Contrast-enhanced MRI (CE-MRI) represents the current mainstay for
monitoring treatment response in glioblastoma multiforme (GBM), based on the premise that …

Radiogenomics to characterize regional genetic heterogeneity in glioblastoma

…, S Peng, KA Smith, P Nakaji, JP Karis… - Neuro …, 2017 - academic.oup.com
Background Glioblastoma (GBM) exhibits profound intratumoral genetic heterogeneity. Each
tumor comprises multiple genetically distinct clonal populations with different therapeutic …

Ten-year analysis of saccular aneurysms in the Barrow Ruptured Aneurysm Trial

…, FC Albuquerque, NK Hills, P Nakaji, JP Karis… - Journal of …, 2019 - thejns.org
OBJECTIVE The authors present the 10-year results of the Barrow Ruptured Aneurysm Trial
(BRAT) for saccular aneurysms. The 1-, 3-, and 6-year results of the trial have been …

Noninvasive imaging of treated cerebral aneurysms, Part II: CT angiographic follow-up of surgically clipped aneurysms

RC Wallace, JP Karis, S Partovi… - American journal of …, 2007 - Am Soc Neuroradiology
Although not useful for the evaluation of coiled aneurysms, CT angiography (CTA) is far superior
to MR angiography (MRA) for the evaluation of aneurysms after surgical clipping. Using …

Optimized preload leakage-correction methods to improve the diagnostic accuracy of dynamic susceptibility-weighted contrast-enhanced perfusion MR imaging in …

…, DS Pinnaduwage, TL Paine, JP Karis… - American Journal …, 2010 - Am Soc Neuroradiology
BACKGROUND AND PURPOSE: Relative cerebral blood volume (rCBV) accuracy can vary
substantially depending on the dynamic susceptibility-weighted contrast-enhanced (DSC) …

Anatomical and biomechanical analyses of the unique and consistent locations of sacral insufficiency fractures

…, NR Crawford, S Baek, RL Anderson, AM Pitt, JP Karis… - Spine, 2009 - journals.lww.com
Study Design. Correlation of locations of sacral insufficiency fractures is made to regions of
stress depicted by finite element analysis derived from biomechanical models of patient …