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Abstract

A SPECT camera system has detector heads (14a, 14b, 14c) each having a collimator (18) facing toward an examination region (10). The detectors receive emission radiation from a radioisotope injected into a subject in the examination region and, preferably, also receive transmission radiation from a transmission source (20) disposed across the examination region. The detectors rotate around the subject through a plurality of projection angles. The detectors generate projection views from the received radiation for each projection angle. The projection views are stored in a projection view memory (26). A reconstruction processor (38) reconstructs the projection views into a volumetric image representation that is stored in a volumetric image memory (40). A reprojector (42) reprojects the volumetric image and volume of interest along each projection angle producing a set of reprojection views and regions of interest. A view comparator (50) compares each corresponding projection and reprojected view within the region of interest along a common projection direction. A translator (52) translates or offsets each projection view in accordance with the comparison to produce a corrected or shifted projection view. The corrected projection views are then reconstructed to produce a motion corrected volumetric image representation. This procedure may be iterated to optimize the motion correction.

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First Claim