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The Journal of the Korean Society for Therapeutic Radiology and Oncology 1998;16(1): 71-79. |
| The Broad-beam CT Image Reconstruction from Simulator Images |
| Byong Yong Yi |
| Department of Radiation Oncology, Asan Medical Center, College of Medicine University of Ulsan, Seoul, Korea. |
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| 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. |
| Key Words:
Broad-beam CT (or Cone beam CT), Simulator-CT, CT-Simulator, Simulation |
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