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. Author manuscript; available in PMC: 2013 Nov 7.
Published in final edited form as: Phys Med Biol. 2012 Oct 3;57(21):6827–6848. doi: 10.1088/0031-9155/57/21/6827

Figure 2.

Figure 2

Reference frame for incident angle calculations for each LOR. The detector area on the starting-side of the LOR is enlarged to show the incident angle (φ,θ) definition. The angles φ and θ are always calculated from starting-side of LOR.