Abstract
In the noninvasive optical measurements of human brain functions, the dependence of pathlength factor in an activation area (effective pathlength factor: EPF) on wavelength was examined by simultaneously recording five wavelengths of 678, 692, 750, 782, and 830 nm, with three different source/detector distances of 20, 30, and 40 mm. We obtained an activation signal in the visual cortex using four wavelength pairs, where 830 nm was fixed as one wavelength. The dependence of EPF on the source/detector distance showed similar tendencies when the wavelengths of 692, 750, and 782 nm were considered. This suggests that it is feasible to use these wavelengths paired with an 830 nm wavelength to investigate the same region.
| Original language | English |
|---|---|
| Journal | Japanese Journal of Applied Physics, Part 2: Letters |
| Volume | 45 |
| Issue number | 12-16 |
| DOIs | |
| Publication status | Published - 2006 May 17 |
| Externally published | Yes |
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Keywords
- Brain function
- Effective pathlength factor (EPF)
- Near-infrared spectroscopy (NIRS)
- Noninvasive measurement
- Optical measurement
- Spatial sensitivity
- Wavelength dependence
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)
Cite this
Wavelength dependence of effective pathlength factor in noninvasive optical measurements of human brain functions. / Satou, Hiroki; Kiguchi, Masashi; Maki, Atsushi.
In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 45, No. 12-16, 17.05.2006.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Wavelength dependence of effective pathlength factor in noninvasive optical measurements of human brain functions
AU - Satou, Hiroki
AU - Kiguchi, Masashi
AU - Maki, Atsushi
PY - 2006/5/17
Y1 - 2006/5/17
N2 - In the noninvasive optical measurements of human brain functions, the dependence of pathlength factor in an activation area (effective pathlength factor: EPF) on wavelength was examined by simultaneously recording five wavelengths of 678, 692, 750, 782, and 830 nm, with three different source/detector distances of 20, 30, and 40 mm. We obtained an activation signal in the visual cortex using four wavelength pairs, where 830 nm was fixed as one wavelength. The dependence of EPF on the source/detector distance showed similar tendencies when the wavelengths of 692, 750, and 782 nm were considered. This suggests that it is feasible to use these wavelengths paired with an 830 nm wavelength to investigate the same region.
AB - In the noninvasive optical measurements of human brain functions, the dependence of pathlength factor in an activation area (effective pathlength factor: EPF) on wavelength was examined by simultaneously recording five wavelengths of 678, 692, 750, 782, and 830 nm, with three different source/detector distances of 20, 30, and 40 mm. We obtained an activation signal in the visual cortex using four wavelength pairs, where 830 nm was fixed as one wavelength. The dependence of EPF on the source/detector distance showed similar tendencies when the wavelengths of 692, 750, and 782 nm were considered. This suggests that it is feasible to use these wavelengths paired with an 830 nm wavelength to investigate the same region.
KW - Brain function
KW - Effective pathlength factor (EPF)
KW - Near-infrared spectroscopy (NIRS)
KW - Noninvasive measurement
KW - Optical measurement
KW - Spatial sensitivity
KW - Wavelength dependence
UR - http://www.scopus.com/inward/record.url?scp=33646474168&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33646474168&partnerID=8YFLogxK
U2 - 10.1143/JJAP.45.L361
DO - 10.1143/JJAP.45.L361
M3 - Article
AN - SCOPUS:33646474168
VL - 45
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 12-16
ER -