Table 1.

Specifications and scan parameters for the conventional and dedicated systems.

	Conventional SPECT	Dedicated high-sensitivity SPECT
System	Siemens Symbia T6 SPECT/CT	Spectrum Dynamics D-SPECT
Crystal	NaI (Tl)	Pixelated CZT
# Heads	2	9
Collimator	Hexagonal LEHR (lead)	Parallel square holes (tungsten)
Hole size (mm)	1.11	2.26
Hole length (mm)	24.05	21.7
Detector size (cm/head)	53 × 38	4 × 16
Scan views (views/head)	120	120
Configuration	180 deg	Predefined, flexible scan pattern
Scan duration (s/view)	5	5
Zoom	2.29	1