Comparison of dermal vs internal light administration in human lungs using the TDLAS-GASMAS technique—Phantom studies

Research output: Contribution to journalArticle


Oxygen and water vapor content, in the lungs of a 3D-printed phantom model based on CT-images of a preterm infant, is evaluated using Tunable Diode Laser Absorption Spectroscopy (TDLAS) in Gas in Scattering Media Absorption Spectroscopy (GASMAS), that is, the TDLAS-GASMAS technique. Oxygen gas is detected through an absorption line near 764 nm and water vapor through an absorption line near 820 nm. A model with a lung containing interior structure is compared to a model with a hollow lung. Compared to the model with the hollow lung, both the mean absorption path length and the transmitted intensity are found to be lower for the model with the structured lung. A new approach, where laser light is delivered internally into the model through an optical fiber, is compared to dermal light administration, that is, illumination onto the skin, for the model with structure inside the lung. The internal light administration generally resulted in larger gas absorption, and higher signal-to-noise ratios, compared to the dermal light administration. The results from the phantom measurements show great promise for the internal illumination approach and a natural next step would be to investigate it further in clinical studies.


External organisations
  • Skåne University Hospital
  • GPX Medical AB
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
  • Other Medical Engineering


  • 3D-print, GASMAS, light scattering, optical phantom, oxygen evaluation, preterm infant, TDLAS
Original languageEnglish
Article numbere201800350
JournalJournal of Biophotonics
Issue number8
Early online date2019
Publication statusPublished - 2019 Aug
Publication categoryResearch

Related research output

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