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OBJECTIVE Adult gliomas have indistinct borders. As the ratio of neoplastic cells to normal cells becomes lower, the ability to detect these cells diminishes. We describe a device designed to augment intraoperative identification of both solid tumor and infiltrating tumor margins. METHODS A novel, intraoperative, optical spectroscopic tool, using both(More)
This paper reports the development of a probability-based spectroscopic diagnostic algorithm capable of simultaneously discriminating tumor core and tumor margins from normal human brain tissues. The algorithm uses a nonlinear method for feature extraction based on maximum representation and discrimination feature (MRDF) and a Bayesian method for(More)
The short- and long-term effects of probe contact pressure on in vivo diffuse reflectance and fluorescence spectroscopy were investigated using an animal model. Elevation in probe contact pressure induced major profile alterations in the diffuse reflectance spectra between 400 and 650 nm, and led to significant intensity increases in the fluorescence(More)
OBJECT Surgery is an important therapeutic modality for pediatric patients with intractable epilepsy. However, existing imaging and diagnostic technologies such as MR imaging and electrocochleography (ECoG) do not always effectively delineate the true resection margin of an epileptic cortical lesion because of limitations in their sensitivity. Optical(More)
BACKGROUND A current limitation of hepatic radiofrequency ablation (RFA) is an inability to detect ablation margins in real time. Thermal injury from RFA alters the biochemical properties governing tissue fluorescence. We hypothesized that the changes in hepatic fluorescence measured during hepatic RFA could be used to detect irreversible hepatocyte damage(More)
OBJECTIVE Magnetic resonance imaging abnormalities in malignant brain tumors after irradiation may represent either recurrent tumor or radiation injury. Optical spectroscopy may represent a novel technique to identify radiation damage in brain tissues and to differentiate contrast-enhancing lesions from recurrent tumor. METHODS Fluorescence and diffuse(More)
PURPOSE Promising results of optical signals have been reported in the literature for the diagnosis of Barrett's esophagus, oral cavity lesions, brain tumor margins, cervical intraepithelial neoplasia, skin cancer and bladder cancer. The potential usefulness of these techniques in renal tissues and neoplasms has not been described to date. This initial(More)
The objective of this in vitro tissue study is to investigate the feasibility of using optical spectroscopy to differentiate pediatric neoplastic and epileptogenic brain from normal brain. Specimens are collected from 17 patients with brain tumors, and from 26 patients with intractable epilepsy during surgical resection of epileptogenic cerebral cortex.(More)
Radiofrequency ablation (RFA) is an evolving technology used to treat unresectable liver tumors. Currently, there is no accurate method to determine RFA margins in real-time during the procedure. We hypothesized that fiber-optic based spectroscopic monitoring system could detect thermal damage from RFA in real-time. Fluorescence (F) and diffuse reflectance(More)
We explore the feasibility of using combined fluorescence and diffuse reflectance spectroscopy to characterize a myocardial infarct at different developing stages. An animal study is conducted using rats with surgically induced myocaridal infarction (MI). In vivo fluorescence spectra at 337-nm excitation and diffuse reflectance between 400 and 900 nm are(More)