Skip to main content

SU-E-T-675: Remote Dosimetry with a Novel PRESAGE Formulation.

Publication ,  Journal Article
Mein, S; Juang, T; Malcolm, J; Adamovics, J; Oldham, M
Published in: Med Phys
June 2015

PURPOSE: 3D-gel dosimetry provides high-resolution treatment validation; however, scanners aren't widely available. In remote dosimetry, dosimeters are shipped out from a central base institution to a remote site for irradiation, then shipped back for scanning and analysis, affording a convenient service for treatment validation to institutions lacking the necessary equipment and resources. Previous works demonstrated the high-resolution performance and temporal stability of PRESAGE. Here the newest formulation is investigated for remote dosimetry use. METHODS: A new formulation of PRESAGE was created with the aim of improved color stability post irradiation. Dose sensitivity was determined by irradiating cuvettes on a Varian Linac (6MV) from 0-15Gy and measuring change in optical density at 633nm. Sensitivity readings were tracked over time in a temperature control study to determine long-term stability. A large volume study was performed to evaluate the accuracy for remote dosimetry. A 1kg dosimeter was pre-scanned, irradiated on-site with an 8Gy 4field box treatment, post-scanned and shipped to Princess Margaret Hospital for remote reading on an identical scanner. RESULTS: Dose sensitivities ranged from 0.0194-0.0295 ΔOD/(Gy*cm)-similar to previous formulations. Post-irradiated cuvettes stored at 10°C retained 100% initial sensitivity over 5 days and 98.6% over 10 weeks while cuvettes stored at room temperature fell to 95.8% after 5 days and 37.4% after 10 weeks. The immediate and 5-day scans of the 4field box dosimeter data was reconstructed, registered to the corresponding eclipse dose-distribution, and compared with analytical tools in CERR. Immediate and 5-day scans looked visually similar. Line profiles revealed close agreement aside from a slight elevation in dose at the edge in the 5-day readout. CONCLUSION: The remote dosimetry formulation exhibits excellent temporal stability in small volumes. While immediate and 5-day readout scans of large volume dosimeters show promising agreement, further development is required to reduce an apparent time dependent edge elevation.

Duke Scholars

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

June 2015

Volume

42

Issue

6

Start / End Page

3492

Location

United States

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Mein, S., Juang, T., Malcolm, J., Adamovics, J., & Oldham, M. (2015). SU-E-T-675: Remote Dosimetry with a Novel PRESAGE Formulation. Med Phys, 42(6), 3492. https://doi.org/10.1118/1.4925038
Mein, S., T. Juang, J. Malcolm, J. Adamovics, and M. Oldham. “SU-E-T-675: Remote Dosimetry with a Novel PRESAGE Formulation.Med Phys 42, no. 6 (June 2015): 3492. https://doi.org/10.1118/1.4925038.
Mein S, Juang T, Malcolm J, Adamovics J, Oldham M. SU-E-T-675: Remote Dosimetry with a Novel PRESAGE Formulation. Med Phys. 2015 Jun;42(6):3492.
Mein, S., et al. “SU-E-T-675: Remote Dosimetry with a Novel PRESAGE Formulation.Med Phys, vol. 42, no. 6, June 2015, p. 3492. Pubmed, doi:10.1118/1.4925038.
Mein S, Juang T, Malcolm J, Adamovics J, Oldham M. SU-E-T-675: Remote Dosimetry with a Novel PRESAGE Formulation. Med Phys. 2015 Jun;42(6):3492.

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

June 2015

Volume

42

Issue

6

Start / End Page

3492

Location

United States

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences