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TU‐FF‐A2‐06: The Verification of Respiratory‐Gated Radiation Treatments Using 3D Dosimetry Techniques

Publication ,  Conference
Brady, S; Sakhalkar, H; Maurer, J; Yoo, S; Adamovics, J; Gluckman, G; Oldham, M
Published in: Medical Physics
January 1, 2008

Purpose: This work investigates the feasibility of verifying respiratory gated treatments using a new 3D dosimetry system consisting of a radiochromic plastic (PRESAGE™) with optical‐CT readout. Method and Materials: Three identical PRESAGE™ dosimeters (5cm radius × 5cm length) were manufactured for insertion into a CIRS' Dynamic Thorax Phantom. CT scans of the phantom were acquired corresponding to 3 motion scenarios; (1) static CT (no motion), (2) moving non‐gated CT (free‐breathing), and (3) moving gated CT. In the moving scans, the PRESAGE™ insert sinusoidally oscillated in the sup‐inf direction with a 3cm amplitude and 4.5sec period. A simple plan with AP/PA parallel opposed beams was created in the Eclipse planning system to treat a simulated small lung nodule (1.5cm), central to the insert, for all 3 scenarios. The simple plan enabled accurate independent measurement using EBT films. Each plan was then delivered to the phantom twice, first containing the PRESAGE™ insert and second the EBT insert. The gated treatments were delivered using the Varian RPM gating system. The dose recorded in the PRESAGE™ dosimeters was determined by optical‐CT using a novel, fast, in‐house CCD based scanner, which acquired all data in ∼10min. The doses among PRESAGE™, EBT, and Eclipse were compared. Results: In the cases of static and moving gated treatments, excellent agreement (<1mm distance‐to‐agreement) was observed between the PRESAGE™ and EBT measurements. For the moving non‐gated treatment, good agreement was again observed between PRESAGE™ and EBT. Significant differences are seen between the PRESAGE™/EBT films and the Eclipse distribution due to the modeling effects of penumbral broadening at small fields. Conclusion: The combination of small field sizes and sophisticated gating techniques represents a challenging scenario for dosimetry verification. The PRESAGE™ /optical‐CT 3D dosimetry system is demonstrated to achieve high quality, fast, relative dosimetry verification of gating treatments. © 2008, American Association of Physicists in Medicine. All rights reserved.

Duke Scholars

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2008

Volume

35

Issue

6

Start / End Page

2921

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
Brady, S., Sakhalkar, H., Maurer, J., Yoo, S., Adamovics, J., Gluckman, G., & Oldham, M. (2008). TU‐FF‐A2‐06: The Verification of Respiratory‐Gated Radiation Treatments Using 3D Dosimetry Techniques. In Medical Physics (Vol. 35, p. 2921). https://doi.org/10.1118/1.2962649
Brady, S., H. Sakhalkar, J. Maurer, S. Yoo, J. Adamovics, G. Gluckman, and M. Oldham. “TU‐FF‐A2‐06: The Verification of Respiratory‐Gated Radiation Treatments Using 3D Dosimetry Techniques.” In Medical Physics, 35:2921, 2008. https://doi.org/10.1118/1.2962649.
Brady S, Sakhalkar H, Maurer J, Yoo S, Adamovics J, Gluckman G, et al. TU‐FF‐A2‐06: The Verification of Respiratory‐Gated Radiation Treatments Using 3D Dosimetry Techniques. In: Medical Physics. 2008. p. 2921.
Brady, S., et al. “TU‐FF‐A2‐06: The Verification of Respiratory‐Gated Radiation Treatments Using 3D Dosimetry Techniques.” Medical Physics, vol. 35, no. 6, 2008, p. 2921. Scopus, doi:10.1118/1.2962649.
Brady S, Sakhalkar H, Maurer J, Yoo S, Adamovics J, Gluckman G, Oldham M. TU‐FF‐A2‐06: The Verification of Respiratory‐Gated Radiation Treatments Using 3D Dosimetry Techniques. Medical Physics. 2008. p. 2921.

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2008

Volume

35

Issue

6

Start / End Page

2921

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