title: Visualizing localized dynamic changes during epileptic seizure onset in vivo with diffuse optical tomography.
abstract: Diffuse optical tomography (DOT) is a promising functional imaging modality due to its ability to provide quantitative and dynamic tomographic imaging of brain functions. This pilot study was conducted to demonstrate that DOT can be used to visualize the changes in local hemodynamics during seizures. The focal seizure was induced by microinjection of 10 microl of 1.9 mM GABAA antagonist bicuculline methiodide (BMI) into the left parietal neocortex of male Harlen Sprague-Dawley rats, which was imaged by a multispectral continuous-wave DOT system. Functional images were obtained by our finite element based image reconstruction algorithm. A series of dynamic 2D images were obtained to delineate the time course of concentration changes of oxyhaemoglobin, deoxyhaemoglobin, and total hemoglobin in the rat brain during seizure onset. The BMI induced epileptic foci were localized and observed over time from the images obtained. Our results suggest that diffuse optical tomography may be a promising modality for epilepsy imaging due to its ability to localize epileptic foci as well as its potential to map the functional activity in the area of human cerebral cortex in planning of epilepsy surgery.
authors.affiliation: J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, Florida 32611, USA.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wang
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Liang
authors.forename: Zhao
authors.initials: Z
authors.lastname: Liu
authors.forename: Qizhi
authors.initials: Q
authors.lastname: Zhang
authors.forename: Paul
authors.initials: P
authors.lastname: Carney
authors.forename: Huabei
authors.initials: H
authors.lastname: Jiang
mesh_terms: D000818:Animals; D001640:Bicuculline / Q000009:adverse effects / Q000031:analogs & derivatives; D001921:Brain / Q000378:metabolism; D004569:Electroencephalography; D004827:Epilepsy / Q000139:chemically induced / Q000175:diagnosis* / Q000378:metabolism*; D018756:GABA Antagonists / Q000009:adverse effects; D006454:Hemoglobins / Q000378:metabolism; D006801:Humans; D055095:Optics and Photonics; D010108:Oxyhemoglobins / Q000378:metabolism; D051381:Rats; D013997:Time Factors; D014054:Tomography / Q000379:methods*
chemical_list: D018756:GABA Antagonists; D006454:Hemoglobins; D010108:Oxyhemoglobins; C017069:bicuculline methiodide; C100003:deoxyhemoglobin; D001640:Bicuculline