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. Author manuscript; available in PMC: 2013 Jul 7.
Published in final edited form as: Phys Med Biol. 2010 Apr 19;55(9):2761–2788. doi: 10.1088/0031-9155/55/9/022

Figure 13.

Figure 13

(a) Illustration of the limited angle tomography effect. The dual-panel geometry only covers a certain limited range of projection angles (θmax less than 180°) and the incomplete angular sampling would cause resolution degradation or artifacts along the X direction (orthogonal to panels). (b) Illustration of the DOI blurring effect (also known as parallax error) and how it affects both the in-plane and orthogonal-plane resolutions. Only two layers of detectors are shown. For an adjacent parallel LOR pair, the effective blurring (i.e. parallax error) is AB (A′B′) along the Y direction (which affects the in-plane resolution) and AC (A′C′) along the X direction (which affects the orthogonal-plane resolution).