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. 1999 Dec 8;82(1):88–92. doi: 10.1054/bjoc.1999.0882

Preservation of tumour oxygen after hyperbaric oxygenation monitored by magnetic resonance imaging

Y Kinoshita 1, K Kohshi 1,2, N Kunugita 3, T Tosaki 4, A Yokota 1
PMCID: PMC2363207  PMID: 10638972

Abstract

Hyperbaric oxygen (HBO) has been proposed to reduce tumour hypoxia by increasing the dissolved molecular oxygen in tissue. Using a non-invasive magnetic resonance imaging (MRI) technique, we monitored the changes in MRI signal intensity after HBO exposure because dissolved paramagnetic molecular oxygen itself shortens the T1 relation time. SCCVII tumour cells transplanted in mice were used. The molecular oxygen-enhanced MR images were acquired using an inversion recovery-preparation fast low angle shot (IR-FLASH) sequence sensitizing the paramagnetic effects of molecular oxygen using a 4.7 tesla MR system. MR signal of muscles decreased rapidly and returned to the control level within 40 min after decompression, whereas that of tumours decreased gradually and remained at a high level 60 min after HBO exposure. In contrast, the signal from the tumours in the normobaric oxygen group showed no significant change. Our data suggested that MR signal changes of tumours and muscles represent an alternation of extravascular oxygenation. The preserving tumour oxygen concentration after HBO exposure may be important regarding adjuvant therapy for cancer patients. © 2000 Cancer Research Campaign

Keywords: hyperbaric oxygenation, molecular oxygen, paramagnetism, relaxation time, magnetic resonance imaging

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Selected References

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