Benchmarking beam alignment for a clinical helical tomotherapy device

A clinical helical tomotherapy treatment machine has been installed at the University of Wisconsin Comprehensive Cancer Center. Beam alignment has been finalized and accepted by UW staff. Helical tomotherapy will soon be clinically available to other sites. Clinical physicists who expect to work wit...

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Bibliographic Details
Published in:Medical physics (Lancaster) 2003-06, Vol.30 (6), p.1118-1127
Main Authors: Balog, John, Mackie, T. R., Pearson, D., Hui, Susanta, Paliwal, Bhudatt, Jeraj, Robert
Format: Article
Language:English
Subjects:
Accelerators
beam alignment
Benchmarking - methods
Benchmarking - standards
Calibration - standards
Cancer
Collimation
collimators
commissioning dosimetry
Computed radiography
computerised tomography
dosimetry
Dosimetry/exposure assessment
Equipment Failure Analysis
Film Dosimetry - instrumentation
Film Dosimetry - methods
Film Dosimetry - standards
Gas‐filled counters: ionization chambers, proportional, and avalanche counters
Humans
ionisation chambers
linear accelerators
multileaf collimator
Physicists
Quality Control
Radiation detectors
radiation therapy
Radiometry - instrumentation
Radiometry - methods
Radiometry - standards
Radiotherapy Dosage
Radiotherapy, Computer-Assisted - methods
Radiotherapy, Computer-Assisted - standards
Radiotherapy, Conformal - instrumentation
Radiotherapy, Conformal - standards
Reproducibility of Results
Sensitivity and Specificity
Tomography, Spiral Computed - methods
Tomography, Spiral Computed - standards
tomotherapy
Wedges and compensators
X‐ and γ‐ray sources, mirrors, gratings, and detectors
X‐ray detection
X‐ray optics
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Description
Summary:A clinical helical tomotherapy treatment machine has been installed at the University of Wisconsin Comprehensive Cancer Center. Beam alignment has been finalized and accepted by UW staff. Helical tomotherapy will soon be clinically available to other sites. Clinical physicists who expect to work with this machine will need to be familiar with its unique dosimetric characteristics, and those related to the geometrical beam configuration and its verification are described here. A series of alignment tests and the results are presented. Helical tomotherapy utilizes an array of post-patient xenon-filled megavoltage radiation detectors. These detectors have proved capable of performing some alignment verification tests. That is particularly advantageous because those tests can then be automated and easily performed on an ongoing basis.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.1576395