Table 1.

SPECT acquisition parameters

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)