Cerenkov luminescence endoscopy: Improved molecular sensitivity with β--emitting radiotracers
- Stanford Univ., Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States); Fourth Military Medical Univ., Shaanxi (China)
- Fourth Military Medical Univ., Shaanxi (China)
- Stanford Univ., Stanford, CA (United States); Stanford Univ. School of Medicine, Stanford, CA (United States)
Cerenkov luminescence endoscopy (CLE) is an optical technique that captures the Cerenkov photons emitted from highly energetic moving charged particles (β+ or β$$-$$) and can be used to monitor the distribution of many clinically available radioactive probes. A main limitation of CLE is its limited sensitivity to small concentrations of radiotracer, especially when used with a light guide. We investigated the improvement in the sensitivity of CLE brought about by using a β$$-$$ radiotracer that improved Cerenkov signal due to both higher β-particle energy and lower γ noise in the imaging optics because of the lack of positron annihilation. Here, the signal-to-noise ratio (SNR) of 90Y was compared with that of 18F in both phantoms and small-animal tumor models. Sensitivity and noise characteristics were demonstrated using vials of activity both at the surface and beneath 1 cm of tissue. Rodent U87MG glioma xenograft models were imaged with radiotracers bound to arginine-glycine-aspartate (RGD) peptides to determine the SNR. As a result, γ noise from 18F was demonstrated by both an observed blurring across the field of view and a more pronounced fall-off with distance. A decreased γ background and increased energy of the β particles resulted in a 207-fold improvement in the sensitivity of 90Y compared with 18F in phantoms. 90Y-bound RGD peptide produced a higher tumor-to-background SNR than 18F in a mouse model. In conclusion, the use of 90Y for Cerenkov endoscopic imaging enabled superior results compared with an 18F radiotracer.
- Research Organization:
- Stanford Univ., CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); National Natural Science Foundation of China (NSFC)
- Grant/Contract Number:
- SC0008397; W81XWH-11-1-0087; W81XWH-11-1-0070; W81XWH-10-1-0506
- OSTI ID:
- 1345590
- Journal Information:
- Journal of Nuclear Medicine, Vol. 55, Issue 11; ISSN 0161-5505
- Publisher:
- Society of Nuclear Medicine and Molecular ImagingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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