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Optimization of a fast optical CT scanner for nPAG gel dosimetry

Jan Vandecasteele UGent and Yves De Deene UGent (2009) JOURNAL OF PHYSICS CONFERENCE SERIES. 164(1).
abstract
A fast laser scanning optical CT scanner was constructed and optimized at the Ghent university. The first images acquired were contaminated with several imaging artifacts. The origins of the artifacts were investigated. Performance characteristics of different components were measured such as the laser spot size, light attenuation by the lenses and the dynamic range of the photo-detector. The need for a differential measurement using a second photo-detector was investigated. Post processing strategies to compensate for hardware related errors were developed. Drift of the laser and of the detector was negligible. Incorrectly refractive index matching was dealt with by developing an automated matching process. When scratches on the water bath and phantom container are present, these pose a post processing challenge to eliminate the resulting artifacts from the reconstructed images Secondary laser spots due to multiple reflections need to be further investigated. The time delay in the control of the galvanometer and detector was dealt with using black strips that serve as markers of the projection position. Still some residual ringing artifacts are present. Several small volumetric test phantoms were constructed to obtain an overall picture of the accuracy.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
3D dosimetry, nPAG gel dosimetry, optical CT scanning
in
JOURNAL OF PHYSICS CONFERENCE SERIES
J. Phys. Conf. Ser.
volume
164
issue
1
article_number
012024
pages
7 pages
publisher
IOP
place of publication
Bristol, UK
conference name
5th International conference on Radiotherapy Gel Dosimetry (DOSGEL 2008)
conference location
Hersonissos, Crete, Greece
conference start
2008-09-19
conference end
2008-10-03
ISSN
1742-6596
DOI
10.1088/1742-6596/164/1/012024
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
841698
handle
http://hdl.handle.net/1854/LU-841698
date created
2010-01-27 09:33:22
date last changed
2011-07-26 09:48:21
@inproceedings{841698,
  abstract     = {A fast laser scanning optical CT scanner was constructed and optimized at the Ghent university. The first images acquired were contaminated with several imaging artifacts. The origins of the artifacts were investigated. Performance characteristics of different components were measured such as the laser spot size, light attenuation by the lenses and the dynamic range of the photo-detector. The need for a differential measurement using a second photo-detector was investigated. Post processing strategies to compensate for hardware related errors were developed. Drift of the laser and of the detector was negligible. Incorrectly refractive index matching was dealt with by developing an automated matching process. When scratches on the water bath and phantom container are present, these pose a post processing challenge to eliminate the resulting artifacts from the reconstructed images Secondary laser spots due to multiple reflections need to be further investigated. The time delay in the control of the galvanometer and detector was dealt with using black strips that serve as markers of the projection position. Still some residual ringing artifacts are present. Several small volumetric test phantoms were constructed to obtain an overall picture of the accuracy.},
  articleno    = {012024},
  author       = {Vandecasteele, Jan and De Deene, Yves},
  booktitle    = {JOURNAL OF PHYSICS CONFERENCE SERIES},
  issn         = {1742-6596},
  keyword      = {3D dosimetry,nPAG gel dosimetry,optical CT scanning},
  language     = {eng},
  location     = {Hersonissos, Crete, Greece},
  number       = {1},
  pages        = {7},
  publisher    = {IOP},
  title        = {Optimization of a fast optical CT scanner for nPAG gel dosimetry},
  url          = {http://dx.doi.org/10.1088/1742-6596/164/1/012024},
  volume       = {164},
  year         = {2009},
}

Chicago
Vandecasteele, Jan, and Yves De Deene. 2009. “Optimization of a Fast Optical CT Scanner for nPAG Gel Dosimetry.” In Journal of Physics Conference Series. Vol. 164. Bristol, UK: IOP.
APA
Vandecasteele, J., & De Deene, Y. (2009). Optimization of a fast optical CT scanner for nPAG gel dosimetry. JOURNAL OF PHYSICS CONFERENCE SERIES (Vol. 164). Presented at the 5th International conference on Radiotherapy Gel Dosimetry (DOSGEL 2008), Bristol, UK: IOP.
Vancouver
1.
Vandecasteele J, De Deene Y. Optimization of a fast optical CT scanner for nPAG gel dosimetry. JOURNAL OF PHYSICS CONFERENCE SERIES. Bristol, UK: IOP; 2009.
MLA
Vandecasteele, Jan, and Yves De Deene. “Optimization of a Fast Optical CT Scanner for nPAG Gel Dosimetry.” Journal of Physics Conference Series. Vol. 164. Bristol, UK: IOP, 2009. Print.