Table 1. Tumor-to-background (TBR) values for primary tumor and metastases.

	Mean TBR	95% confidence interval
Primary tumor	3.5 (n = 5)	3.3; 3.7
Metastases	3.4 (n = 9)	3.1; 4.0

Some metastases were down to 1 mm³ and still clearly visible. Tumor to background values.