Abstract

The difference between the displacement of the center-of-rotation (mechanical shift) and the electronic centering misalignment (electronic shift) in cone beam single photon emission computed tomography (SPECT) is evaluated. A method is proposed to determine both mechanical shift (MS) and electronic shift (ES) using the coordinate of the centroid of a projected point source sampled over 360 degrees and the Marquardt nonlinear fitting algorithm. Both shifts are characterized by two orthogonal components. This method is verified using Monte Carlo simulated point source data with different combinations of mechanical and electronic shifts. Both shifts can be determined precisely. This method is also applied to a CB-SPECT system. This study suggests that calibration of the system is needed on a periodic basis. >

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