Short-Distance Detectors

NIRx has developed a cutting edge method of capturing the superficial confounding signals (i.e. scalp perfusion, respiration, meyer waves, cardiac). One of the fundamental challenges in fNIRS is the isolation of cortical functional activation from these signals of non-interest.  As the field of fNIRS has matured, the importance of employment, and efficacy in use, of multi-distance placements for identification and potential for removal of such components, has been demonstrated.

 

…With NIRx

  • Our engineered solution allows for full scalp placement

  • We provide literature supported 8mm short distance channels.

  • Multiple bundles for scalability

Short Channel Advantages…

  • Improved analysis

  • Greater characterization global systemic artifacts

  • Quality assurance in (data) collection

Tachtsidis and Scholkmann “False positives and false negatives in functional near-infrared spectroscopy: issues, challenges and the way forward.” Neurophotonics 3.3(2016):031405.

Tachtsidis and Scholkmann “False positives and false negatives in functional near-infrared spectroscopy: issues, challenges and the way forward.” Neurophotonics 3.3(2016):031405.

Functionality

Long channel (in yellow) between a source and detector and short-channel (in purple) detected by short channels clipped under the source.

Long channel (in yellow) between a source and detector and short-channel (in purple) detected by short channels clipped under the source.

  • True short-distance source-detector-separation:

  • Default = 8 mm, other distances possible

  • Compatible with all NIRx instruments

  • (NIRScout, NIRScoutXP, NIRSport1, NIRSport2)

  • Highly economic:

    • 8 short-distance channels occupy one detector channel

  • Supported by NIRx Software:

    • NIRStar, nirsLAB, Aurora, NIRSite

  • Easy-to apply and comfortable for subjects

  • Applicable on all head areas, with and without hair

Each short-distance detector bundle is effectively driven by just one single detecting probe, providing a total of eight independent short-distance channels; which can be freely placed over the cortex to capture global artifact(s). Multiple bundles may be employed to provide for high resolution cortical coverage, spanning any number of channels. These can be seen below straddling each emitting source.

Short channel bundle with single-tip optodes.

Short channel bundle with single-tip optodes.

Short channel bundle around holder bases

Short channel bundle around holder bases

+ Selected Publications

Santosa, H., Zhai, X., Fishburn, F., Sparto, P. J., & Huppert, T. J. (2020). Quantitative comparison of correction techniques for removing systemic physiological signal in functional near-infrared spectroscopy studies. Neurophotonics, 7(3), 035009.

Wyser, D., Mattille, M., Wolf, M., Lambercy, O., Scholkmann, F., & Gassert, R. (2020). Short-channel regression in functional near-infrared spectroscopy is more effective when considering heterogeneous scalp hemodynamics. Neurophotonics, 7(3), 035011.

Caldwell, M., Scholkmann, F., Wolf, U., Wolf, M., Elwell, C., & Tachtsidis, I. (2016). Modelling confounding effects from extracerebral contamination and systemic factors on functional near-infrared spectroscopy. Neuroimage, 143, 91-105.