The effects of music and darkness on radionuclide distribution during mice FDG-PET scan

Document Type : Full paper (Original article)

Authors

1 Graduated from Faculty of Medicine, Tehran University of Medical Sciences (TUMS), Tehran, Iran, and Research Center for Molecular and Cellular Imaging (RCMCI), Advanced Medical Technologies and Equipment Institute (AMTEI), Tehran University of Medical Sciences (TUMS), Tehran, Iran

2 Department of Toxicology and Pharmacology, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran, and Pharmaceutical Sciences Research Center, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran

3 Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Tehran University of Medical Sciences (TUMS), Tehran, Iran, and Research Center for Molecular and Cellular Imaging (RCMCI), Advanced Medical Technologies and Equipment Institute (AMTEI), Tehran University of Medical Sciences (TUMS), Tehran, Iran

Abstract

Background: There is growing interest in the therapeutic potential of music or light in different human disorders. Aims: This study aimed to evaluate the effects of music as well as darkness on FDG uptake in 4T1 tumor-bearing BALB/c mice using a PET scan. Methods: The music, darkness, and music plus darkness groups were subjected to either song or darkness and their combination, respectively, 30 min before the radiopharmaceutical injection until the end of the experiments. The control group was imaged in silence under ambient conditions. Results: Our results revealed that music did not significantly alter the range of tumor SUVmean, but showed a slight increase in brain SUVmean (18.2%) and about 100% increase in brain percentage of injected dose per gram (%ID/g) in ex vivo analysis. In contrast, heart SUVmean and heart %ID/g were approximately half those of the silence group. The muscle SUVmean and blood activity measurements showed a decrement upon music exposure. Also, results showed a significant difference in tumor-to-muscle ratio (85% increment) and brain-to-muscle ratio (105% increment) between the silence and music groups. The muscle SUVmean decreased by 50%, and tumor-to-muscle and brain-to-muscle ratios were observed to increase by 44% and 60% in the group exposed to darkness, respectively. Conclusion: Our results suggest that music and environmental factors may influence FDG uptake in small-animal PET imaging, and provide important insights into the reliability of FDG-PET imaging for music intervention research and may aid researchers in investigating the effects of music on brain changes and tissue metabolism.

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References

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