Comparison of dermal vs internal light administration in human lungs using the TDLAS‐GASMAS technique—Phantom studies. Issue 8 (2nd May 2019)

• Record Type: Journal Article
• Authors: Larsson, Jim; Leander, Dennis; Lewander Xu, Märta; Fellman, Vineta; Bood, Joakim; Krite Svanberg, Emilie
• Is Part Of: Journal of biophotonics. Volume 12:Issue 8(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-05-02
• Subjects: 3D‐print -- GASMAS -- light scattering -- optical phantom -- oxygen evaluation -- preterm infant -- TDLAS; Photonics -- Periodicals; Optical materials -- Periodicals; Optics -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3605
• DOI: 10.1002/jbio.201800350
• Languages: English
• ISSNs: 1864-063X

Abstract

Abstract: 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. Abstract : A 3D‐printed model of the thorax of an infant was used for gas content analysis of the lungs based on TDLAS. The light was delivered by applying an optical fiber directly onto the skin of the model or by internal illumination with the fiber through the food or windpipe. Generally, the internal light administration resulted in stronger oxygen and water vapor absorption signals, which is promising for future preclinical trials.