University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Sophisticated test objects for the quality assurance of optical computed tomography scanners.

Abdul Rahman, AT, Bräuer-Krisch, E, Brochard, T, Adamovics, J, Clowes, SK, Bradley, D and Doran, SJ (2011) Sophisticated test objects for the quality assurance of optical computed tomography scanners. Phys Med Biol, 56 (14). pp. 4177-4199.

[img] Text
AbdulRahman_etal_PMB_test_objects_2011.pdf
Restricted to Repository staff only

Download (2MB)

Abstract

Optical computed tomography (CT), in conjunction with radiochromic gels and plastics, shows great potential for radiation therapy dose verification in 3D. However, an effective quality assurance (QA) regime for the various scanners currently available still remains to be developed. We show how the favourable properties of the PRESAGE® radiochromic polymer may be exploited to create highly sophisticated QA phantoms. Five 60 mm diameter cylindrical PRESAGE® samples were irradiated using the x-ray microbeam radiation therapy facility on the ID-17 biomedical beamline at the European Synchrotron Radiation Facility. Samples were then imaged on the University of Surrey parallel-beam optical CT scanner. The sample irradiations were designed to allow a variety of tests to be performed, including assessments of linearity, modulation transfer function (three independent measurements), geometric distortion and the effect of treatment fractionation. It is clear that, although the synchrotron method produces extremely high-quality test objects, it is not practical on a routine basis, because of its reliance on a highly specialized radiation source. Hence, we investigated a second possibility: three PRESAGE® samples were illuminated with ultraviolet light of wavelength 365 nm, using cheap masks created by laser-printing patterns onto overhead projector acetate sheets. There was good correlation between optical densities measured by the CT scanner and the expected UV 'dose' delivered. The results are encouraging and a proposal is made for a scanner test regime based on calibrated and well-characterized PRESAGE® samples.

Item Type: Article
Authors :
NameEmailORCID
Abdul Rahman, ATUNSPECIFIEDUNSPECIFIED
Bräuer-Krisch, EUNSPECIFIEDUNSPECIFIED
Brochard, TUNSPECIFIEDUNSPECIFIED
Adamovics, JUNSPECIFIEDUNSPECIFIED
Clowes, SKUNSPECIFIEDUNSPECIFIED
Bradley, DUNSPECIFIEDUNSPECIFIED
Doran, SJUNSPECIFIEDUNSPECIFIED
Date : 21 July 2011
Identification Number : 10.1088/0031-9155/56/14/001
Uncontrolled Keywords : Linear Models, Optical Processes, Quality Control, Radiation Dosage, Radiotherapy, Synchrotrons, Tomography, X-Ray Computed, Ultraviolet Rays
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 15:25
Last Modified : 31 Oct 2017 14:08
URI: http://epubs.surrey.ac.uk/id/eprint/7062

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800