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  1. Australasian Physics & Engineering Sciences in Medicine
  2. Australasian Physics & Engineering Sciences in Medicine : Volume 30
  3. Australasian Physics & Engineering Sciences in Medicine : Volume 30, Issue 2, June 2007
  4. A study on beam homogeneity for a Siemens Primus linac
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Australasian Physics & Engineering Sciences in Medicine : Volume 40
Australasian Physics & Engineering Sciences in Medicine : Volume 39
Australasian Physics & Engineering Sciences in Medicine : Volume 38
Australasian Physics & Engineering Sciences in Medicine : Volume 37
Australasian Physics & Engineering Sciences in Medicine : Volume 36
Australasian Physics & Engineering Sciences in Medicine : Volume 35
Australasian Physics & Engineering Sciences in Medicine : Volume 34
Australasian Physics & Engineering Sciences in Medicine : Volume 33
Australasian Physics & Engineering Sciences in Medicine : Volume 32
Australasian Physics & Engineering Sciences in Medicine : Volume 31
Australasian Physics & Engineering Sciences in Medicine : Volume 30
Australasian Physics & Engineering Sciences in Medicine : Volume 30, Issue 4, December 2007
Australasian Physics & Engineering Sciences in Medicine : Volume 30, Issue 3, September 2007
Australasian Physics & Engineering Sciences in Medicine : Volume 30, Issue 2, June 2007
Reminiscences on APESM in the Post-Clarkean epoch and some hints to potential authors
Interim recommendations for a digital mammography quality assurance program
Comparison of performance of computer display monitors for radiological diagnosis; “diagnostic” high brightness monochrome LCD, 3MP vs “clinical review” colour LCD, 2MP
Verification of nose irradiation using orthovoltage x-ray beams
An investigation of central axis depth dose distribution perturbation due to an air gap between patient and bolus for electron beams
Evaluation of MOSFETs for entrance dose dosimetry for 6 and 10 MV photons with a custom made build up cap
Commissioning of motorized wedge for the first Equinox-80 telecobalt unit and implementation in the Eclipse 3D treatment planning system
Characterisation of a Ferrous Agarose Xylenol ( FAX ) gel for radiotherapy dose measurement
A wideband frequency-shift keying demodulation technique for inductively powered biomedical implants
A study on beam homogeneity for a Siemens Primus linac
Australasian Physics & Engineering Sciences in Medicine : Volume 30, Issue 1, March 2007
Australasian Physics & Engineering Sciences in Medicine : Volume 29
Australasian Physics & Engineering Sciences in Medicine : Volume 28
Australasian Physics & Engineering Sciences in Medicine : Volume 27
Australasian Physics & Engineering Sciences in Medicine : Volume 26
Australasian Physics & Engineering Sciences in Medicine : Volume 25
Australasian Physics & Engineering Sciences in Medicine : Volume 24

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The effect of the primary collimator and flattening filter on asymmetric fields for a Siemens PRIMUS linear accelerator

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A study on beam homogeneity for a Siemens Primus linac

Content Provider Springer Nature Link
Author Henriquez, F. Cutanda Vargas Castrillón, S. T.
Copyright Year 2007
Abstract Asymmetric offset fields are an important tool for radiotherapy and their suitability for treatment should be assessed. Dose homogeneity for highly asymmetric fields has been studied for a Siemens PRIMUS clinical linear accelerator. Profiles and absolute dose have been measured in fields with two jaws at maximal position (20 cm) and the other two at maximal overtravel (10 cm), corresponding to 10 cm × 10 cm fields with extreme offset. Measured profiles have a marked decreasing gradient towards the beam edge, making these fields unsuitable for treatments. The flattening filter radius is smaller than the primary collimator aperture, and this creates beam inhomogeneities that affect large fields in areas far from the collimator axis, and asymmetric fields with large offset. The results presented assess the effect that the design of the primary collimator and flattening filter assembly has on beam homogeneity. This can have clinical consequences for treatments involving fields that include these inhomogeneous areas. Comparison with calculations from a treatment planning system, Philips Pinnacle v6.3, which computes under the hypotheses of a uniformly flattened beam, results in severe discrepancies.
Starting Page 147
Ending Page 151
Page Count 5
File Format PDF
ISSN 01589938
Journal Australasian Physics & Engineering Sciences in Medicine
Volume Number 30
Issue Number 2
e-ISSN 18795447
Language English
Publisher Springer Netherlands
Publisher Date 2007-01-01
Publisher Place Dordrecht
Access Restriction Subscribed
Subject Keyword asymmetric fields collimator flattening filter photon dosimetry Biomedicine general Biophysics and Biological Physics Medical and Radiation Physics Biomedical Engineering Theoretical, Mathematical and Computational Physics
Content Type Text
Resource Type Article
Subject Radiology, Nuclear Medicine and Imaging Physics and Astronomy Biophysics Biomedical Engineering
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