Table 4 Parameters describing the system sensitivity as function of source collimator distance
From: Feasibility of 177Lu activity quantification using a small portable CZT-based gamma-camera
Energy window [keV] | \({c}_{0}\) [cps/MBq] | \({c}_{1}\) [cps/MBq] | \({c}_{2}\) [mm−1] | |
|---|---|---|---|---|
MEGP (gross) | 55 | 6.8 | 5.7 | 0.0025 |
Large cylinder | 113 | − 1.2 | 18.4 | 0.0008 |
208 | 7.8 | 5.6 | 0.0079 | |
MEGP (net, TEW) | 55 | 1.6 | 4.9 | 0.0008 |
Large cylinder | 113 | − 12.1 | 25.1 | 0.0003 |
208 | 6.3 | 4.4 | 0.0067 | |
LEHR (gross) | 55 | 14.7 | 5.3 | 0.0143 |
Large cylinder | 113 | 20.2 | 7.0 | 0.0107 |
208 | 12.6 | 16.6 | 0.0232 | |
LEHR (net, TEW) | 55 | 5.5 | 3.4 | 0.0027 |
Large cylinder | 113 | 12.4 | 6.1 | 0.0036 |
208 | 10.1 | 12.8 | 0.0227 | |
MEGP (gross) | 55 | 5.5 | 6.6 | 0.0021 |
Small tube | 113 | 9.4 | 8.0 | 0.0023 |
208 | 8.1 | 5.1 | 0.0101 | |
MEGP (net, TEW) | 55 | 5.7 | 0.6 | 0.0026 |
Small tube | 113 | 4.7 | 8.6 | 0.0009 |
208 | 6.5 | 4.0 | 0.0090 | |
LEHR (gross) | 55 | 14.5 | 4.1 | 0.0198 |
Small tube | 113 | 20.7 | 5.9 | 0.0157 |
208 | 12.1 | 11.0 | 0.0306 | |
LEHR (net, TEW) | 55 | 7.4 | 1.2 | 0.0082 |
Small tube | 113 | 13.2 | 5.7 | 0.0046 |
208 | 9.8 | 8.5 | 0.0300 |