Abstract
Oxygen plays a key role in tumor therapy and may be related to tumordevelopment: e.g., angiogenesis and metastasis. Using noninvasive techniques to accurately measure tumor oxygenation could assist in developing novel therapies. Here, we have used the FREDOM (Fluorocarbon Relaxometry using Echo planar imaging for Dynamic Oxygen Mapping) approach based on hexafluorobenzene (HFB) to monitor tissue oxygen tension (pO2) of rat breast and prostate tumors and compared the results with changes in tumor vascular hemoglobin saturation (sO2) and concentration observed using a new dual wavelength homodyne near-infrared (NIR) system. The dynamic changes in pO2 and sO2 were assessed while rats were breathing various gases. NIR showed significant changes in vascular oxygenation accompanying respiratory interventions. 19F MR-EPI also showed significant changes in tissue pO2 and revealed considerable regional heterogeneity in both absolute values and rate of change accompanying interventions. Generally, changes in vascular sO2 preceded tissue pO2, particularly for smaller tumors.
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Abbreviations
- NIR:
-
Near infrared
- EPI:
-
Echo Planar Imaging
- HFB:
-
Hexafluorobenzene
- FREDOM:
-
Fluorocarbon Relaxometry using Echo phanar imaging for Dynamic Oxygen Mapping
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Song, Y. et al. (2003). Tumor Oxygen Dynamics: Comparison of 19F MR EPI and Frequency Domain NIR Spectroscopy. In: Dunn, J.F., Swartz, H.M. (eds) Oxygen Transport to Tissue XXIV. Advances in Experimental Medicine and Biology, vol 530. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0075-9_22
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DOI: https://doi.org/10.1007/978-1-4615-0075-9_22
Publisher Name: Springer, Boston, MA
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