Figure 4From: Portable PET probes are a novel tool for intraoperative localization of tumor deposits Beta detection better pinpoints the source of radiation than gamma detection. Beta and gamma measurements were taken at incremental distances from the tumors 1-hour following intravenous injection of radiolabeled 18F. Beta detection was nearly zero at distances > 5 cm from the source, while gamma emission was still detectable at 15 cm. Data from a representative animal is shown to demonstrate that at the spot over tumor, the beta counts are high, but after the probe is moved ~2 cm away from the tumor, counts are nearing zero. In contrast, the gamma probe detects emissions up to 10 cm away from the site of tumor.Back to article page