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The purpose of this study is to correct the movement errors that may occurbecause of the patients' movement during the CT scanning and thus, to obtainmore precise CT images, additionally to investigate the possible use ofParallel Beam CT in the dental treatment. An extracted human tooth was scannedwith PBCT and the possible movement errors that patients may cause during theCT scan were intentionally assigned. The maximum width of errors was designedto reach 0.1 mm. The trajectory of the fixed point was traced in the sinogramthat includes the fixed point. The part deviated from the sinusoidal curve wasmodified using the Virtual Alignment Method. The quality of reconstructed imagewas remarkably degraded when the movement errors were given. A radiopaque partinside the tooth was used as a fixed point. The errors were corrected byshifting the fixed point to the center of sinogram and this relocation of fixedpoint did not cause any distortion of image or change of size. The movementerrors were corrected with the fixed point inside the tooth. The more preciseCT images obtained through this method are expected to be of extensiveapplication in the area of dental treatment using CAD/CAM.

Possibility of using Parallel beam CT in dental treatment by correction of movement errors with virtual Alignment Method