Implantology.  2020 Jun;24(2):51-61. 10.32542/implantology.202006.

Correction of Movement Error in Parallel-beam CT for Dental Implantology

Affiliations
  • 1PhD, Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University, Seoul, Korea
  • 2Professor, Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University, Seoul, Korea
  • 3Researcher, Pohang Accelerator Laboratory, Pohang University of Science and Technology KR, Gyeongbuk, Korea
  • 4Researcher, Weill Cornell Medicine CLC Genomics Resources Core Facility, New York, USA
  • 5PhD, Department of Applied Mathematics and Statistics, Stony Brook University, New York, USA

Abstract

Purpose
The purpose of this study is to correct the errors that may occur because of the patients' movement during the CT scanning, and thus, to obtain more precise CT images, additionally to investigate the possible use of parallel Beam CT in the dental treatment.
Materials and Methods
Applying the Radon transform using phantom image, the same image and the sinogram with the ones by CT scanning were obtained. The possible movement errors that patients may cause during the CT scan were given to the data images. The maximum width of errors was designed to reach 1 mm. The fixed point was identified in the errored CT projected images, and each projected image with errors was adjusted so that each fixed point is placed on the same axial plane, then the fixed point was traced on the sinogram. On the traced trajectory of the fixed point, the part deviated from the sinusoidal curve was modified using the Virtual Alignment Method.
Results
The quality of reconstructed image was remarkably degraded when the movement errors were given. The movement errors were corrected by moving the fixed point to the center of sinogram and this relocation of fixed point did not cause any distortion of image or change of size.
Conclusion
The movement errors during CT scanning were corrected using the fixed point inside of the image. The more precise CT images obtained through this method are expected to be of extensive application in the area of dental implantology.

Keyword

Fixed point; Parallel Beam CT; Phantom image; Radon transform; Sinogram; Virtual Alignment Method
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