Rearrangeable and exchangeable optical module with system-on-chip for wearable functional near-infrared spectroscopy system

Tsukasa Funane, Takashi Numata, Hiroki Satou, Shinsuke Hiraizumi, Yuichi Hasegawa, Hidenobu Kuwabara, Kiyoshi Hasegawa, Masashi Kiguchi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We developed a system-on-chip (SoC)-incorporated light-emitting diode (LED) and avalanche photodiode (APD) modules to improve the usability and flexibility of a fiberless wearable functional near-infrared spectroscopy (fNIRS) system. The SoC has a microprocessing unit and programmable circuits. The time division method and the lock-in method were used for separately detecting signals from different positions and signals of different wavelengths, respectively. Each module autonomously works for this time-divided-lock-in measurement with a high sensitivity for haired regions. By supplying +3.3V of power and base and data clocks, the LED module emits both 730- and 855-nm wavelengths of light, amplitudes of which are modulated in each lock-in frequency generated from the base clock, and the APD module provides the lock-in detected signals synchronizing with the data clock. The SoC provided many functions, including automatic-power-control of the LED, automatic judgment of detected power level, and automatic-gain-control of the programmable gain amplifier. The number and the arrangement of modules can be adaptively changed by connecting this exchangeable modules in a daisy chain and setting the parameters dependent on the probing position. Therefore, users can configure a variety of arrangements (single- or multidistance combinations) of them with this module-based system.

Original languageEnglish
Article number011007
JournalNeurophotonics
Volume5
Issue number1
DOIs
Publication statusPublished - 2018 Jan 1
Externally publishedYes

Keywords

  • functional near-infrared spectroscopy
  • module-based system
  • system-on-chip
  • wearable

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

Cite this

Rearrangeable and exchangeable optical module with system-on-chip for wearable functional near-infrared spectroscopy system. / Funane, Tsukasa; Numata, Takashi; Satou, Hiroki; Hiraizumi, Shinsuke; Hasegawa, Yuichi; Kuwabara, Hidenobu; Hasegawa, Kiyoshi; Kiguchi, Masashi.

In: Neurophotonics, Vol. 5, No. 1, 011007, 01.01.2018.

Research output: Contribution to journalArticle

Funane, Tsukasa ; Numata, Takashi ; Satou, Hiroki ; Hiraizumi, Shinsuke ; Hasegawa, Yuichi ; Kuwabara, Hidenobu ; Hasegawa, Kiyoshi ; Kiguchi, Masashi. / Rearrangeable and exchangeable optical module with system-on-chip for wearable functional near-infrared spectroscopy system. In: Neurophotonics. 2018 ; Vol. 5, No. 1.
@article{2a0f6df2249a448cb06cd10497acec1e,
title = "Rearrangeable and exchangeable optical module with system-on-chip for wearable functional near-infrared spectroscopy system",
abstract = "We developed a system-on-chip (SoC)-incorporated light-emitting diode (LED) and avalanche photodiode (APD) modules to improve the usability and flexibility of a fiberless wearable functional near-infrared spectroscopy (fNIRS) system. The SoC has a microprocessing unit and programmable circuits. The time division method and the lock-in method were used for separately detecting signals from different positions and signals of different wavelengths, respectively. Each module autonomously works for this time-divided-lock-in measurement with a high sensitivity for haired regions. By supplying +3.3V of power and base and data clocks, the LED module emits both 730- and 855-nm wavelengths of light, amplitudes of which are modulated in each lock-in frequency generated from the base clock, and the APD module provides the lock-in detected signals synchronizing with the data clock. The SoC provided many functions, including automatic-power-control of the LED, automatic judgment of detected power level, and automatic-gain-control of the programmable gain amplifier. The number and the arrangement of modules can be adaptively changed by connecting this exchangeable modules in a daisy chain and setting the parameters dependent on the probing position. Therefore, users can configure a variety of arrangements (single- or multidistance combinations) of them with this module-based system.",
keywords = "functional near-infrared spectroscopy, module-based system, system-on-chip, wearable",
author = "Tsukasa Funane and Takashi Numata and Hiroki Satou and Shinsuke Hiraizumi and Yuichi Hasegawa and Hidenobu Kuwabara and Kiyoshi Hasegawa and Masashi Kiguchi",
year = "2018",
month = "1",
day = "1",
doi = "10.1117/1.NPh.5.1.011007",
language = "English",
volume = "5",
journal = "Neurophotonics",
issn = "2329-4248",
publisher = "SPIE",
number = "1",

}

TY - JOUR

T1 - Rearrangeable and exchangeable optical module with system-on-chip for wearable functional near-infrared spectroscopy system

AU - Funane, Tsukasa

AU - Numata, Takashi

AU - Satou, Hiroki

AU - Hiraizumi, Shinsuke

AU - Hasegawa, Yuichi

AU - Kuwabara, Hidenobu

AU - Hasegawa, Kiyoshi

AU - Kiguchi, Masashi

PY - 2018/1/1

Y1 - 2018/1/1

N2 - We developed a system-on-chip (SoC)-incorporated light-emitting diode (LED) and avalanche photodiode (APD) modules to improve the usability and flexibility of a fiberless wearable functional near-infrared spectroscopy (fNIRS) system. The SoC has a microprocessing unit and programmable circuits. The time division method and the lock-in method were used for separately detecting signals from different positions and signals of different wavelengths, respectively. Each module autonomously works for this time-divided-lock-in measurement with a high sensitivity for haired regions. By supplying +3.3V of power and base and data clocks, the LED module emits both 730- and 855-nm wavelengths of light, amplitudes of which are modulated in each lock-in frequency generated from the base clock, and the APD module provides the lock-in detected signals synchronizing with the data clock. The SoC provided many functions, including automatic-power-control of the LED, automatic judgment of detected power level, and automatic-gain-control of the programmable gain amplifier. The number and the arrangement of modules can be adaptively changed by connecting this exchangeable modules in a daisy chain and setting the parameters dependent on the probing position. Therefore, users can configure a variety of arrangements (single- or multidistance combinations) of them with this module-based system.

AB - We developed a system-on-chip (SoC)-incorporated light-emitting diode (LED) and avalanche photodiode (APD) modules to improve the usability and flexibility of a fiberless wearable functional near-infrared spectroscopy (fNIRS) system. The SoC has a microprocessing unit and programmable circuits. The time division method and the lock-in method were used for separately detecting signals from different positions and signals of different wavelengths, respectively. Each module autonomously works for this time-divided-lock-in measurement with a high sensitivity for haired regions. By supplying +3.3V of power and base and data clocks, the LED module emits both 730- and 855-nm wavelengths of light, amplitudes of which are modulated in each lock-in frequency generated from the base clock, and the APD module provides the lock-in detected signals synchronizing with the data clock. The SoC provided many functions, including automatic-power-control of the LED, automatic judgment of detected power level, and automatic-gain-control of the programmable gain amplifier. The number and the arrangement of modules can be adaptively changed by connecting this exchangeable modules in a daisy chain and setting the parameters dependent on the probing position. Therefore, users can configure a variety of arrangements (single- or multidistance combinations) of them with this module-based system.

KW - functional near-infrared spectroscopy

KW - module-based system

KW - system-on-chip

KW - wearable

UR - http://www.scopus.com/inward/record.url?scp=85029797409&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85029797409&partnerID=8YFLogxK

U2 - 10.1117/1.NPh.5.1.011007

DO - 10.1117/1.NPh.5.1.011007

M3 - Article

VL - 5

JO - Neurophotonics

JF - Neurophotonics

SN - 2329-4248

IS - 1

M1 - 011007

ER -