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Toward acquiring comprehensive radiosurgery field commissioning data using the PRESAGE/optical-CT 3D dosimetry system.

Publication ,  Journal Article
Clift, C; Thomas, A; Adamovics, J; Chang, Z; Das, I; Oldham, M
Published in: Phys Med Biol
March 7, 2010

Achieving accurate small field dosimetry is challenging. This study investigates the utility of a radiochromic plastic PRESAGE read with optical-CT for the acquisition of radiosurgery field commissioning data from a Novalis Tx system with a high-definition multileaf collimator (HDMLC). Total scatter factors (Sc, p), beam profiles, and penumbrae were measured for five different radiosurgery fields (5, 10, 20, 30 and 40 mm) using a commercially available optical-CT scanner (OCTOPUS, MGS Research). The percent depth dose (PDD), beam profile and penumbra of the 10 mm field were also measured using a higher resolution in-house prototype CCD-based scanner. Gafchromic EBT film was used for independent verification. Measurements of Sc, p made with PRESAGE and film agreed with mini-ion chamber commissioning data to within 4% for every field (range 0.2-3.6% for PRESAGE, and 1.6-3.6% for EBT). PDD, beam profile and penumbra measurements made with the two PRESAGE/optical-CT systems and film showed good agreement with the high-resolution diode commissioning measurements with a competitive resolution (0.5 mm pixels). The in-house prototype optical-CT scanner allowed much finer resolution compared with previous applications of PRESAGE. The advantages of the PRESAGE system for small field dosimetry include 3D measurements, negligible volume averaging, directional insensitivity, an absence of beam perturbations, energy and dose rate independence.

Duke Scholars

Published In

Phys Med Biol

DOI

EISSN

1361-6560

Publication Date

March 7, 2010

Volume

55

Issue

5

Start / End Page

1279 / 1293

Location

England

Related Subject Headings

  • Tomography, Optical
  • Scattering, Radiation
  • Reproducibility of Results
  • Radiosurgery
  • Radiometry
  • Radiation Dosage
  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 1103 Clinical Sciences
  • 0903 Biomedical Engineering
 

Citation

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Clift, C., Thomas, A., Adamovics, J., Chang, Z., Das, I., & Oldham, M. (2010). Toward acquiring comprehensive radiosurgery field commissioning data using the PRESAGE/optical-CT 3D dosimetry system. Phys Med Biol, 55(5), 1279–1293. https://doi.org/10.1088/0031-9155/55/5/002
Clift, Corey, Andrew Thomas, John Adamovics, Zheng Chang, Indra Das, and Mark Oldham. “Toward acquiring comprehensive radiosurgery field commissioning data using the PRESAGE/optical-CT 3D dosimetry system.Phys Med Biol 55, no. 5 (March 7, 2010): 1279–93. https://doi.org/10.1088/0031-9155/55/5/002.
Clift C, Thomas A, Adamovics J, Chang Z, Das I, Oldham M. Toward acquiring comprehensive radiosurgery field commissioning data using the PRESAGE/optical-CT 3D dosimetry system. Phys Med Biol. 2010 Mar 7;55(5):1279–93.
Clift, Corey, et al. “Toward acquiring comprehensive radiosurgery field commissioning data using the PRESAGE/optical-CT 3D dosimetry system.Phys Med Biol, vol. 55, no. 5, Mar. 2010, pp. 1279–93. Pubmed, doi:10.1088/0031-9155/55/5/002.
Clift C, Thomas A, Adamovics J, Chang Z, Das I, Oldham M. Toward acquiring comprehensive radiosurgery field commissioning data using the PRESAGE/optical-CT 3D dosimetry system. Phys Med Biol. 2010 Mar 7;55(5):1279–1293.
Journal cover image

Published In

Phys Med Biol

DOI

EISSN

1361-6560

Publication Date

March 7, 2010

Volume

55

Issue

5

Start / End Page

1279 / 1293

Location

England

Related Subject Headings

  • Tomography, Optical
  • Scattering, Radiation
  • Reproducibility of Results
  • Radiosurgery
  • Radiometry
  • Radiation Dosage
  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 1103 Clinical Sciences
  • 0903 Biomedical Engineering