Rafael Martins Ferreira
University Federal de Santa Catarina, Brazil
Title: Spatial and tFunctional MR Imaging in preoperative planning of glial tumorsemporal correlations between amyloid-PET (Florbetapir and PiB) retention and white matter intensity
Biography
Biography: Rafael Martins Ferreira
Abstract
Functional Magnetic Resonance Imaging (fMRI) is a technique that takes advantage of the diferences in magnetic susceptibility
between oxyhemoglobin and deoxyhemoglobin. Once the goal of neurosurgery is to maximize patient safety and to minimize
residual tumor, fMRI may be an alternative, non-invasive and reproducible tool for assessing potential risk of dysfunction resulting
from brain ressection near eloquente cortex. Tumoral mass effects can distort normal cortical anatomy losing anatomical landmarks.
So fMRI studies with specific –tasks combines structural with physiological information and provides data helping in localizing
cortex controlling language, motor, sensory, hearing and visual pathways , according to tumor region. In addition, many studies
confirm the large individual variability in cortical localization of language and fmri data may aid in the determination of language
laterality and localization of Wernicke’s and Broca’s areas in cases of temporo-parietal lesions. Althout fmri can show cortical signals,
imaging the White matter bundle may be just as crucial. Therefore Diffusion Tensor imaging complements fMRI examinations and
provides the surgeon with fiber-tracking information. In summary, fMRI data can alter a neurosurgical approach to a tumor, indicates
eloquent cortex in distorted areas, guide surgical resections or even emphasize too high risk in total tumor resection in other cases.
Clinical cases showing such fMRI applications and a literature review about clinical outcomes is presented.