Use of BANG® polymer gel for dose measurements in a 68 MeV proton beam

BANG polymer gel dosimetry using magnetic resonance imaging (MRI) was applied to an ophthalmologic 68 MeV proton beam. The object was to examine the use of BANG gel for the verification of proton fields in eye tumor therapy and to explore the applicability of polymer gel dosimetry in proton therapy...

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Bibliographic Details
Published in:Medical physics (Lancaster) 2003-06, Vol.30 (6), p.1235-1240
Main Authors: Heufelder, J., Stiefel, S., Pfaender, M., Lüdemann, L., Grebe, G., Heese, J.
Format: Article
Language:English
Subjects:
Anatomy and optics of eye
biomedical MRI
Cancer
Clinical applications
dosimetry
Dosimetry/exposure assessment
Equipment Failure Analysis
eye
Gas‐filled counters: ionization chambers, proportional, and avalanche counters
Gels
Gels - radiation effects
Gels and sols
Humans
Image scanners
ionisation chambers
Ionization chambers
Linear Energy Transfer
Magnetic resonance
Magnetic resonance imaging
Magnetic Resonance Imaging - instrumentation
Magnetic Resonance Imaging - methods
Models, Theoretical
polymer gel dosimetry
polymer gels
Polymers
Polymers - radiation effects
proton beams
proton detection
proton dosimetry
Proton therapy
Protons
Protons - therapeutic use
Quality assurance equipment
quality control
quality management
radiation therapy
Radiometry - instrumentation
Radiometry - methods
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted - methods
Radiotherapy, High-Energy - methods
Reproducibility of Results
Sensitivity and Specificity
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Description
Summary:BANG polymer gel dosimetry using magnetic resonance imaging (MRI) was applied to an ophthalmologic 68 MeV proton beam. The object was to examine the use of BANG gel for the verification of proton fields in eye tumor therapy and to explore the applicability of polymer gel dosimetry in proton therapy under practical aspects. The gel phantoms were irradiated with monoenergetic and modulated proton beams. MRI analysis was carried out at clinical 1.5 and 3 T MR scanners. At constant LET, results show a linear relationship between spin–spin relaxation rates and dose. However, depth dose curves in BANG gel reveal a quenching of the Bragg maximum due to LET effects. The dose response of the gel for monoenergetic protons and spread-out depth dose distributions can be calculated based on ionization chamber measurements. Experiment and calculations show good agreement and indicate that BANG polymer gels might become a valuable tool in proton therapy quality assurance.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.1575557