Mr. Shahbaz Askari Profile

Shahbaz Askari

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Publications (14)

Proceedings Article | 6 March 2023 Presentation + Paper

Optical monitoring of transplanted free flaps using an implantable near-infrared spectroscopy sensor

Aaron Mah, Donald Anderson, Shahbaz Askari, Sadra Khosravi, Oleksandr Butskiy, Babak Shadgan

Proceedings Volume 12375, 123750C (2023) https://doi.org/10.1117/12.2668817

KEYWORDS: Near infrared spectroscopy, Sensors, Tissues, Surgery, Neck, Head, Oxygenation, Hemodynamics, Optical sensing, Pulse signals

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Proceedings Article | 6 March 2023 Presentation + Paper

Predicting muscle anaerobic threshold by using a wearable optical sensor during exercise

Aaron Mah, Mehdi Nourizadeh, Justin Wyss, Shahbaz Askari, Babak Shadgan

Proceedings Volume 12375, 123750B (2023) https://doi.org/10.1117/12.2668675

KEYWORDS: Near infrared spectroscopy, Muscles, Heart, Sensors, Blood, Oxygenation, Oxygen, Education and training, Wearable devices, Injuries

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Proceedings Article | 6 March 2023 Presentation + Paper

Spreading depression and near-infrared spectroscopy during seizures in patients with medically intractable epilepsy

Zoya J. R. Bastany, Shahbaz Askari, Ali Gorji, Christoph Kellinghaus, Nayyereh Akbari, Guy Dumont

Proceedings Volume 12375, 1237507 (2023) https://doi.org/10.1117/12.2666095

KEYWORDS: Near infrared spectroscopy, Electroencephalography, Sensors, Electrodes, Epilepsy, Wave propagation, Oxygen, Brain, Depolarization, Plastics

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Proceedings Article | 6 March 2023 Presentation + Paper

Active noise cancelling in near-infrared spectroscopy

Shahbaz Askari, Zoya J. R. Bastany, Guy Dumont, Babak Shadgan

Proceedings Volume 12375, 1237504 (2023) https://doi.org/10.1117/12.2664609

KEYWORDS: Near infrared spectroscopy, Sensors, Capacitance, Noise cancelling, Tissues, Signal to noise ratio, Interference (communication), Electromagnetism, Electromagnetic interference, Signal attenuation

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Proceedings Article | 12 May 2022 Poster + Presentation

Optical assessment of silicon materials for design of implantable optical sensors

Garrett Frank, Shahbaz Askari, Sadra Khosravi, Brain Kwon, Babak Shadgan

Proceedings Volume PC11968, PC1196809 (2022) https://doi.org/10.1117/12.2623520

KEYWORDS: Silicon, Scattering, Optical sensors, Light scattering, Sensors, Optical design, Photodetectors, Near infrared spectroscopy, Tissue optics, Spinal cord

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Proceedings Article | 2 March 2022 Presentation + Paper

Studying the accuracy of infrared thermography for measuring core body temperature

Aaron Mah, Leili Ghazi Zadeh, Mahta Khoshnam Tehrani, Shahbaz Askari, Babak Shadgan

Proceedings Volume 11956, 119560E (2022) https://doi.org/10.1117/12.2608929

KEYWORDS: Thermal imaging cameras, Body temperature, Thermography, Gold, Forward looking infrared, Infrared cameras, Infrared radiation, Temperature metrology, Infrared imaging, Infrared detectors

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Proceedings Article | 2 March 2022 Presentation + Paper

Combined near-infrared spectroscopy (NIRS) and electroencephalography (EEG) in gamma-band during pain perception

Shahbaz Askari, Zoya Bastany, Baran Askari, Babak Shadgan, Guy Dumont

Proceedings Volume 11956, 1195604 (2022) https://doi.org/10.1117/12.2622420

KEYWORDS: Electroencephalography, Near infrared spectroscopy, Electrodes, Sensors, Hemodynamics, Tissues, Light sources, Brain, Electronic filtering, Signal attenuation

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Proceedings Article | 2 March 2022 Presentation + Paper

Histological assessment of an implantable optical sensor and spinal cord tissue interface

Farnaz Sahragard, Amanda Cheung, Femke Streijger, Shahbaz Askari, Brian Kwon, Babak Shadgan

Proceedings Volume 11956, 1195607 (2022) https://doi.org/10.1117/12.2614081

KEYWORDS: Sensors, Spinal cord, Near infrared spectroscopy, Tissue optics, Injuries, Tissues, Photodetectors, Optical sensors, Light emitting diodes, Silicon

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Background: We developed an implantable optical sensor based on near-infrared spectroscopy (NIRS) to continuously monitor spinal cord oxygenation and hemodynamics in patients with acute spinal cord injury (SCI). As a safety assessment measure, we aimed to study the effect of near-infrared (NIR) light emission and contact compression of the NIRS sensor on spinal cord tissue structure. Our previous in-vitro heat tests indicated no heat generation by the NIRS sensor. This study evaluated whether the NIRS sensor resulted in any potential compression damage to the spinal cord using histological analysis. Methods: Six Yucatan mini-pigs received a T10 SCI. A custom implantable NIRS sensor (version 2) was placed extradurally on the spinal cord and fixed with magnets and cross-connectors. After seven days of continuous data collection at 100Hz, the sensor was removed to allow for histological examination of the spinal cord tissue. Cellular damage was observed in the spinal cord at the NIRS sensor placement site in two animals. The design, shape, and material of the NIRS sensor were significantly revised to reduce the sensor footprint, minimize the compression on the cord, increase the sensor flexibility, and improve its clinical application. An in-vivo pilot experiment was performed on a Yucatan miniature pig with a T10 SCI to evaluate potential compression damage of the spinal cord tissue from placement and direct contact of the refined NIRS sensor (version 5). A fibrin sealant, TISSEEL, was utilized to fix the version 5 NIRS sensor on the spinal cord. Result: There were no signs of cellular damage, indentation, and significant flattening on the dorsal surface of the spinal cord where the version 5 NIRS sensor was placed for up to 4.5 hours. Conclusion: The refined NIRS sensor did not cause any compression damage to the porcine spinal cord after implantation for 4.5 hours. Implanting this sensor on the spinal cord of SCI patients requires further in-vivo examinations to ensure the sensor is safe to use for up to 14 days.

Proceedings Article | 2 March 2022 Presentation + Paper

A method for the fixation of an implantable spinal cord NIRS sensor

Amanda Cheung, Shahbaz Askari, Farnaz Sahragard, Katharina Raschdorf, Megan Webster, Audrey Warner, Jay Ethridge, Kitty So, Garret Frank, Julia Hill, Femke Streijger, Brian Kwon, Babak Shadgan

Proceedings Volume 11956, 1195606 (2022) https://doi.org/10.1117/12.2609065

KEYWORDS: Sensors, Near infrared spectroscopy, Spinal cord, Silicon, Fluoroscopy, Surgery, Photodetectors, Injuries, Light emitting diodes

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Proceedings Article | 2 March 2022 Presentation + Paper

Recording dual-mode near-infrared spectroscopy and ultra-low frequency electroencephalography during spreading depression

Shahbaz Askari, Zoya Bastany, Ali Gorji, Guy Dumont

Proceedings Volume 11956, 1195605 (2022) https://doi.org/10.1117/12.2623088

KEYWORDS: Electroencephalography, Near infrared spectroscopy, Electrodes, Brain, Sensors, Hemodynamics, Signal to noise ratio, Potassium, Tissues, Fiber optics

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Proceedings Article | 9 March 2021 Presentation + Paper

Lighting up babies' brains: development of a combined NIRS/EEG system for infants

Shahbaz Askari, Zoya Bastany, Liisa Holsti, Guy Dumont

Proceedings Volume 11638, 116380N (2021) https://doi.org/10.1117/12.2595899

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Proceedings Article | 21 February 2020 Presentation + Paper

Combined low-frequency EEG and NIRS during hypoxia

Shahbaz Askari, Zoya Bastany, Liisa Holsti, Ali Gorji, Guy Dumont

Proceedings Volume 11237, 1123706 (2020) https://doi.org/10.1117/12.2550234

KEYWORDS: Electroencephalography, Near infrared spectroscopy, Brain, Electrodes, Hemodynamics, Tissues, Signal detection, Sensors, Light sources, Carbon dioxide

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Proceedings Article | 21 February 2020 Presentation + Paper

Ambient noise reduction in cerebral near infrared spectroscopy based on frequency division multiplexing

Shahbaz Askari, Zoya Bastany, Roberto Pagano, Guy Dumont

Proceedings Volume 11237, 1123703 (2020) https://doi.org/10.1117/12.2545214

KEYWORDS: Near infrared spectroscopy, Signal detection, Modulation, Light, Bandpass filters, Tissues, Signal to noise ratio, Sensors

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Proceedings Article | 26 February 2019 Paper

A low cost mobile controlled CW-NIRS absolute oximeter to prevent child mortality in low-income countries

Roberto Pagano, Shahbaz Askari, Christian Petersen, Shaylene Beaudry, Dustin Dunsmuir, Matthew Wiens, Elias Kumbakumba, Gabrielle Napoleone, J. Mark Ansermino, Guy Dumont

Proceedings Volume 10869, 1086913 (2019) https://doi.org/10.1117/12.2510769

KEYWORDS: Near infrared spectroscopy, Tissues, Tissue optics, Oxygen, Absorption, Measurement devices, Light sources, Scattering, Oximeters, Light scattering

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Showing 5 of 14 publications

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