Retinotopic mapping of adult human visual cortex with high-density diffuse optical tomography

Research output: Contribution to journalArticlepeer-review

Authors

  • Benjamin W Zeff
  • Brian R White
  • Hamid Dehghani
  • Bradley L Schlaggar
  • Joseph P Culver

Colleges, School and Institutes

Abstract

Functional neuroimaging is a vital element of neuroscience and cognitive research and, increasingly, is an important clinical tool. Diffuse optical imaging is an emerging, noninvasive technique with unique portability and hemodynamic contrast capabilities for mapping brain function in young subjects and subjects in enriched or clinical environments. We have developed a high-performance, high-density diffuse optical tomography (DOT) system that overcomes previous limitations and enables superior image quality. We show herein the utility of the DOT system by presenting functional hemodynamic maps of the adult human visual cortex. The functional brain images have a high contrast-to-noise ratio, allowing visualization of individual activations and highly repeatable mapping within and across subjects. With the improved spatial resolution and localization, we were able to image functional responses of 1.7 cm in extent and shifts of <1 cm. Cortical maps of angle and eccentricity in the visual field are consistent with retinotopic studies using functional MRI and positron-emission tomography. These results demonstrate that high-density DOT is a practical and powerful tool for mapping function in the human cortex.

Details

Original languageEnglish
Pages (from-to)12169-74
Number of pages6
JournalNational Academy of Sciences. Proceedings
Volume104
Issue number29
Publication statusPublished - 17 Jul 2007

Keywords

  • Adult, Brain Mapping, Female, Humans, Male, Tomography, Optical, Visual Cortex