Table 2 Information on the measurements with the NEMA image quality phantom filled with 99mTc and 166Ho in different phantom setups (spheres without background; sphere-to-background activity concentration ratio 8:1 and 4:1)
From: Gamma camera imaging characteristics of 166Ho and 99mTc used in Selective Internal Radiation Therapy
Nuclide | Phantom setup | Activity concentration in spheres (kBq/ml) | Activity concentration in background (kBq/ml) | Sphere-to-background activity concentration ratio |
|---|---|---|---|---|
99mTc | spheres without background | 698.0 | - | - |
8:1 contrast (performed twice) | 338.8 419.6 | 39.6 44.6 | 8.56:1 7.86:1 | |
4:1 contrast | 213.7 | 52.4 | 4.08:1 | |
166Ho | spheres without background | 1376.0 | - | - |
8:1 contrast (performed twice) | 719.2 589.5 | 85.7 74.4 | 8.39:1 7.92:1 | |
4:1 contrast | 386.6 | 91.5 | 4.23:1 |