Table 1.
Collimator | Medium energy, low penetration |
Matrix | 128 × 128 |
Zoom | 1.0 |
Pixel | 4.8 mm |
Angular steps | 96 (48 per head) over 360° |
Mode | Step and shoot |
Orbit | Contouring |
Time per frame | 10–15 s for patient studies; 10–40 s for calibration and phantom studies |
Energy windows | A. Photopeak (208 keV, 20% width, 187.2–228.8 keV) |
B. Lower scatter (10% width, 166.4 to 187.2 keV) | |
C. General scatter (110.9 keV, 100% width, 55.5–166.4 keV) | |
D. General scatter (37.0 keV, 100% width, 18.5–55.5 keV) |