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Preliminary evaluation of optical CT scanning versus MRI for nPAG gel dosimetry: the Ghent experience

Jan Vandecasteele UGent and Yves De Deene UGent (2009) JOURNAL OF PHYSICS CONFERENCE SERIES. 164(1).
abstract
The aim of this study was to evaluate fast laser-scanning optical CT versus MRI for an nPAG gel dosimeter in terms of accuracy and precision. Three small cylindrical volumetric gel phantoms were fabricated and irradiated with photon beams. The gel dosimeters were scanned with an MR scanner and an in house developed laser scanning optical CT scanner. A comparison between MRI and optical CT scanning was performed based on the reconstructed images. Preliminary results show a fair correspondence in the MRI acquired and optical CT acquired dose maps. Still, ringing artifacts contaminate the reconstructed optical CT images. These may be related to sub-pixel misalignments between the blank projection and the acquired transmission projection of the gel phantom. Another artifact may be caused by refraction near the edges of the field. Further optimisation of our optical CT scanner is required to obtain the same accuracy as with MRI. To make a comparison between the two imaging modalities in terms of precision, the intrinsic dose precision on readout (IPD ) was calculated which is independent of spatial resolution and acquisition time. It is shown that optical CT has a better intrinsic dose precision.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
3D dosimetry, gel dosimeters, image reconstruction, optical CT scanning, laser scanning optical CT scanner, MRI, nPAG gel dosimetry
in
JOURNAL OF PHYSICS CONFERENCE SERIES
J. Phys. Conf. Ser.
volume
164
issue
1
article_number
012034
pages
6 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
2008-09-29
conference end
2008-10-03
ISSN
1742-6596
DOI
10.1088/1742-6596/164/1/012034
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
841693
handle
http://hdl.handle.net/1854/LU-841693
date created
2010-01-27 09:33:22
date last changed
2011-07-26 09:50:46
@inproceedings{841693,
  abstract     = {The aim of this study was to evaluate fast laser-scanning optical CT versus MRI for an nPAG gel dosimeter in terms of accuracy and precision. Three small cylindrical volumetric gel phantoms were fabricated and irradiated with photon beams. The gel dosimeters were scanned with an MR scanner and an in house developed laser scanning optical CT scanner. A comparison between MRI and optical CT scanning was performed based on the reconstructed images. Preliminary results show a fair correspondence in the MRI acquired and optical CT acquired dose maps. Still, ringing artifacts contaminate the reconstructed optical CT images. These may be related to sub-pixel misalignments between the blank projection and the acquired transmission projection of the gel phantom. Another artifact may be caused by refraction near the edges of the field. Further optimisation of our optical CT scanner is required to obtain the same accuracy as with MRI. To make a comparison between the two imaging modalities in terms of precision, the intrinsic dose precision on readout (IPD ) was calculated which is independent of spatial resolution and acquisition time. It is shown that optical CT has a better intrinsic dose precision.},
  articleno    = {012034},
  author       = {Vandecasteele, Jan and De Deene, Yves},
  booktitle    = {JOURNAL OF PHYSICS CONFERENCE SERIES},
  issn         = {1742-6596},
  keyword      = {3D dosimetry,gel dosimeters,image reconstruction,optical CT scanning,laser scanning optical CT scanner,MRI,nPAG gel dosimetry},
  language     = {eng},
  location     = {Hersonissos, Crete, Greece},
  number       = {1},
  pages        = {6},
  publisher    = {IOP},
  title        = {Preliminary evaluation of optical CT scanning versus MRI for nPAG gel dosimetry: the Ghent experience},
  url          = {http://dx.doi.org/10.1088/1742-6596/164/1/012034},
  volume       = {164},
  year         = {2009},
}

Chicago
Vandecasteele, Jan, and Yves De Deene. 2009. “Preliminary Evaluation of Optical CT Scanning Versus MRI for nPAG Gel Dosimetry: The Ghent Experience.” In Journal of Physics Conference Series. Vol. 164. Bristol, UK: IOP.
APA
Vandecasteele, J., & De Deene, Y. (2009). Preliminary evaluation of optical CT scanning versus MRI for nPAG gel dosimetry: the Ghent experience. 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. Preliminary evaluation of optical CT scanning versus MRI for nPAG gel dosimetry: the Ghent experience. JOURNAL OF PHYSICS CONFERENCE SERIES. Bristol, UK: IOP; 2009.
MLA
Vandecasteele, Jan, and Yves De Deene. “Preliminary Evaluation of Optical CT Scanning Versus MRI for nPAG Gel Dosimetry: The Ghent Experience.” Journal of Physics Conference Series. Vol. 164. Bristol, UK: IOP, 2009. Print.