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Interstitial diffuse optical probe with spectral fitting to measure dynamic tumor hypoxia.

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A new optical probe accurately measures real-time tumor oxygen levels and blood volume. This technology aids in understanding tumor hypoxia for improved cancer radiation therapy outcomes.

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Area of Science:

  • Biomedical Optics
  • Cancer Research
  • Medical Imaging

Background:

  • Tumor hypoxia, or low oxygen levels, is a critical factor influencing cancer progression and resistance to radiation therapy.
  • Real-time monitoring of tumor oxygenation and blood dynamics is essential for optimizing cancer treatment strategies.

Purpose of the Study:

  • To develop and validate a novel interstitial diffuse optical probe for high-resolution, real-time measurement of tumor blood volume fraction and hemoglobin oxygen saturation.
  • To benchmark the performance of the optical probe against a photoacoustic imaging system in tracking temporal dynamics of these parameters in a preclinical cancer model.

Main Methods:

  • The diffuse optical probe was characterized and validated using a custom-designed blood vessel system with controlled oxygen saturation and blood volume.
  • Simultaneous measurements of blood volume and oxygen saturation were performed in tumor-bearing mice using the optical probe and photoacoustic imaging.
  • A patient-derived xenograft model of hypopharyngeal carcinoma was utilized for in vivo validation.

Main Results:

  • The optical probe demonstrated consistent monitoring of oxygen saturation changes, correlating with varying concentrations of an oxygen scavenger.
  • Positive correlations were observed between the interstitial diffuse optical probe and photoacoustic imaging in measuring both blood volume fraction and hemoglobin oxygen saturation.
  • The device successfully tracked the temporal dynamics of oxygen saturation and blood volume in a preclinical tumor model.

Conclusions:

  • The novel interstitial diffuse optical probe is a reliable tool for real-time, high-resolution monitoring of tumor oxygenation and blood volume.
  • This technology holds significant potential for advancing cancer research and improving the efficacy of radiation therapy by providing critical insights into tumor microenvironment dynamics.