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A method to characterize the radiation output from a cone beam O-arm using a device for dose and dose profile scanning measurement

Herrnsdorf, Lars LU and Söderberg, Marcus LU orcid (2013) SPIE Medical Imaging, 2013 8668. p.86682-86682
Abstract
The O-arm system is a mobile intraoperative imaging system that is comprised of fluoroscopy and cone beam CT. The configuration of the O-arm system with absence of patient table and a broad beam width (165 mm in isocenter) brings new practical and physical requirements on how to perform dose measurements. The purpose of this study was to describe a method that overcomes this and makes it possible to characterize the radiation output from the O-arm system. A holder with a clamp and a flexible ball joint that can orientate the radiation detector support and the Mover that can be adjusted to hold the dose detector in a horizontal position was used. Evaluation of the dose response for three different dose detectors of different active length... (More)
The O-arm system is a mobile intraoperative imaging system that is comprised of fluoroscopy and cone beam CT. The configuration of the O-arm system with absence of patient table and a broad beam width (165 mm in isocenter) brings new practical and physical requirements on how to perform dose measurements. The purpose of this study was to describe a method that overcomes this and makes it possible to characterize the radiation output from the O-arm system. A holder with a clamp and a flexible ball joint that can orientate the radiation detector support and the Mover that can be adjusted to hold the dose detector in a horizontal position was used. Evaluation of the dose response for three different dose detectors of different active length (0.3, 23.1 and 100 mm) was made for three different beam qualities. Furthermore the dose profile free in air to control the possible heel effect and width of the x-ray field during rotation was measured and the dose rate waveform was analyzed. The FWHM of the dose profile was 162 mm The dose response of the three detectors is reported. The average dose response was lower for the detector with longer active length due to the influence of the dose profile shape. From dynamic measurement total exposure time, pulse width, and the number of pulses were verified. In conclusion, an external horizontal hanging holder with mover option helps to assist to make dose measurement easier and enables characterize the radiation output from the O-arm system. (Less)
Please use this url to cite or link to this publication:
author
and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
cone beam CT, radiation dosimetry, dose profile, FWHM, point dose, point, dose rate
host publication
Medical Imaging 2013: Physics of Medical Imaging
volume
8668
pages
6 pages
publisher
SPIE
conference name
SPIE Medical Imaging, 2013
conference location
Lake Buena Vista (Orlando area), Florida, United States
conference dates
2013-02-09 - 2013-02-14
external identifiers
  • wos:000322002700094
  • scopus:84878282244
ISSN
0277-786X
1996-756X
ISBN
9780819494429
DOI
10.1117/12.2006514
project
Image quality / radiation doses at cone-beam CT (CBCT) examinations
language
English
LU publication?
yes
id
5f302929-340c-44e1-a8af-28c0f2537224 (old id 4027057)
date added to LUP
2016-04-01 10:54:42
date last changed
2024-01-07 04:12:43
@inproceedings{5f302929-340c-44e1-a8af-28c0f2537224,
  abstract     = {{The O-arm system is a mobile intraoperative imaging system that is comprised of fluoroscopy and cone beam CT. The configuration of the O-arm system with absence of patient table and a broad beam width (165 mm in isocenter) brings new practical and physical requirements on how to perform dose measurements. The purpose of this study was to describe a method that overcomes this and makes it possible to characterize the radiation output from the O-arm system. A holder with a clamp and a flexible ball joint that can orientate the radiation detector support and the Mover that can be adjusted to hold the dose detector in a horizontal position was used. Evaluation of the dose response for three different dose detectors of different active length (0.3, 23.1 and 100 mm) was made for three different beam qualities. Furthermore the dose profile free in air to control the possible heel effect and width of the x-ray field during rotation was measured and the dose rate waveform was analyzed. The FWHM of the dose profile was 162 mm The dose response of the three detectors is reported. The average dose response was lower for the detector with longer active length due to the influence of the dose profile shape. From dynamic measurement total exposure time, pulse width, and the number of pulses were verified. In conclusion, an external horizontal hanging holder with mover option helps to assist to make dose measurement easier and enables characterize the radiation output from the O-arm system.}},
  author       = {{Herrnsdorf, Lars and Söderberg, Marcus}},
  booktitle    = {{Medical Imaging 2013: Physics of Medical Imaging}},
  isbn         = {{9780819494429}},
  issn         = {{0277-786X}},
  keywords     = {{cone beam CT; radiation dosimetry; dose profile; FWHM; point dose; point; dose rate}},
  language     = {{eng}},
  pages        = {{86682--86682}},
  publisher    = {{SPIE}},
  title        = {{A method to characterize the radiation output from a cone beam O-arm using a device for dose and dose profile scanning measurement}},
  url          = {{http://dx.doi.org/10.1117/12.2006514}},
  doi          = {{10.1117/12.2006514}},
  volume       = {{8668}},
  year         = {{2013}},
}