Summary
This paper presents CdTe-DSD SPECT-I, a novel small-animal SPECT system based on cadmium telluride double-sided strip detectors originally developed for space-based X-ray and gamma-ray observation. The system achieves approximately threefold improvement in energy resolution compared with existing high-grade semiconductor SPECT systems, enabling simultaneous multi-isotope imaging with minimal spectral contamination and ultrahigh spatial resolution. The authors demonstrate through phantom and animal experiments that the high-energy resolution and crosstalk-subtraction methods effectively suppress image noise whilst enabling visualisation of multiple radioisotope distributions in small tissue volumes within mice.
UK applicability
This is a fundamental measurement technology development paper without direct application to UK agricultural or food systems. However, such advances in molecular imaging instrumentation may eventually support UK-based biomedical research requiring multi-isotope tracer studies in animal models.
Key measures
Energy resolution (keV FWHM at 140 keV, 1.6%), spatial resolution (>0.35 mm), spectral crosstalk levels, image noise suppression, detector performance across multiple radioisotopes
Outcomes reported
The study developed and validated a novel SPECT imaging system (CdTe-DSD SPECT-I) with ultrahigh energy resolution and spatial resolution for simultaneous multi-isotope imaging in mice. The system achieved energy resolution of 1–2 keV (FWHM) in the 10–100 keV range and demonstrated spatial resolution exceeding 0.35 mm with effective spectral crosstalk suppression.
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