J Korean Soc Ther Radiol Oncol.  1998 Mar;16(1):71-79.

The Broad-beam CT Image Reconstruction from Simulator Images

• Yi BY

Abstract

PURPOSE: To generate the axial, coronal and sagittal images from conventional simulation images, as a preliminary study of broad-beam simulator CT.
METHODS
AND MATERIALS: Volumetric filtered back-projection was performed using 90 sheets of films from conventional simulator for every 4. gantry angle. Two mAs exposure condition for 120kVp beam quality at SFD 140cm was given to each film. Outside the silhouette portion was removed and scatter component was deconvolved before back-projection.
RESULTS
The axial, the sagittal and the coronal images with same spatial resolutions over all direction could be obtained. But image quality was very poor.
CONCLUSION
CT images could be obtained using broad-beam. Scatter deconvolution technique was effective for this reconstruction. The fact that same spatial resolutions over all direction tells us the possiblility of application of this technique to DRR or Simulator-CT. But the quality of image should be improved for clinical application practicaly.

Keyword

Broad-beam CT (or Cone beam CT); Simulator-CT; CT-Simulator; Simulation

MeSH Terms

Image Processing, Computer-Assisted*