TABLE I.

Defined geometric parameters of segmented slant-beam collimator.

Symbol	Description
α	Angle between the horizontal (i.e., transaxial) axis and the major axis of the ellipse
β	Angle between the detector norm and the γ-ray
φ	Slant angle of γ-ray in the horizontal (i.e., transaxial) direction, φ ∈ (−90∘, 90∘)
η	Slant angle of γ-ray in vertical (i.e., axial) direction, η ∈ (−90∘, 90∘)
L	Detector length, L = 53.3 cm
W	Detector width, W = 38.7 cm
R	Radius of the CFOV
F	Distance from the rotation center to the detector