1
|
Hernandez-Martin E, Gonzalez-Mora JL. Diffuse optical tomography in the human brain: A briefly review from the neurophysiology to its applications. BRAIN SCIENCE ADVANCES 2021. [DOI: 10.26599/bsa.2020.9050014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The present work describes the use of noninvasive diffuse optical tomography (DOT) technology to measure hemodynamic changes, providing relevant information which helps to understand the basis of neurophysiology in the human brain. Advantages such as portability, direct measurements of hemoglobin state, temporal resolution, non‐restricted movements as occurs in magnetic resonance imaging (MRI) devices mean that DOT technology can be used in research and clinical fields. In this review we covered the neurophysiology, physical principles underlying optical imaging during tissue‐light interactions, and technology commonly used during the construction of a DOT device including the source‐detector requirements to improve the image quality. DOT provides 3D cerebral activation images due to complex mathematical models which describe the light propagation inside the tissue head. Moreover, we describe briefly the use of Bayesian methods for raw DOT data filtering as an alternative to linear filters widely used in signal processing, avoiding common problems such as the filter selection or a false interpretation of the results which is sometimes due to the interference of background physiological noise with neural activity.
Collapse
Affiliation(s)
- Estefania Hernandez-Martin
- Department of Basic Medical Science, Faculty of Health Science, Medicine Section, Universidad de La Laguna, 38071, Spain
| | - José Luis Gonzalez-Mora
- Department of Basic Medical Science, Faculty of Health Science, Medicine Section, Universidad de La Laguna, 38071, Spain
| |
Collapse
|
2
|
Hernandez-Martin E, Marcano F, Modroño C, Janssen N, González-Mora JL. Diffuse optical tomography to measure functional changes during motor tasks: a motor imagery study. BIOMEDICAL OPTICS EXPRESS 2020; 11:6049-6067. [PMID: 33282474 PMCID: PMC7687968 DOI: 10.1364/boe.399907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 09/12/2020] [Accepted: 09/16/2020] [Indexed: 05/03/2023]
Abstract
The present work shows the spatial reliability of the diffuse optical tomography (DOT) system in a group of healthy subjects during a motor imagery task. Prior to imagery task performance, the subjects executed a motor task based on the finger to thumb opposition for motor training, and to corroborate the DOT spatial localization during the motor execution. DOT technology and data treatment allows us to distinguish oxy- and deoxyhemoglobin at the cerebral gyri level unlike the cerebral activations provided by fMRI series that were processed using different approaches. Here we show the DOT reliability showing functional activations at the cerebral gyri level during motor execution and motor imagery, which provide subtler cerebral activations than the motor execution. These results will allow the use of the DOT system as a monitoring device in a brain computer interface.
Collapse
Affiliation(s)
- Estefania Hernandez-Martin
- Department of Basic Medical Science (Physiology), Faculty of Health Sciences, Medicine Section, Universidad de La Laguna 38071, Spain
| | - Francisco Marcano
- Department of Basic Medical Science (Physiology), Faculty of Health Sciences, Medicine Section, Universidad de La Laguna 38071, Spain
- Instituto de Tecnologías Biomédicas, Universidad de la Laguna, Spain
- Instituto de Neurociencias, Universidad de la Laguna, Spain
| | - Cristian Modroño
- Department of Basic Medical Science (Physiology), Faculty of Health Sciences, Medicine Section, Universidad de La Laguna 38071, Spain
- Instituto de Tecnologías Biomédicas, Universidad de la Laguna, Spain
- Instituto de Neurociencias, Universidad de la Laguna, Spain
| | - Niels Janssen
- Instituto de Tecnologías Biomédicas, Universidad de la Laguna, Spain
- Instituto de Neurociencias, Universidad de la Laguna, Spain
- Psychology Department, Universidad de La Laguna 38071, Spain
| | - Jose Luis González-Mora
- Department of Basic Medical Science (Physiology), Faculty of Health Sciences, Medicine Section, Universidad de La Laguna 38071, Spain
- Instituto de Tecnologías Biomédicas, Universidad de la Laguna, Spain
- Instituto de Neurociencias, Universidad de la Laguna, Spain
| |
Collapse
|