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Feasibility of radiosurgery dosimetry using NIPAM 3D dosimeters and x-ray CT

Publication ,  Conference
Adamson, J; Carroll, J; Trager, M; Yoon, P; Kodra, J; Yin, FF; Maynard, E; Hilts, M; Oldham, M; Jirasik, A
Published in: Journal of Physics: Conference Series
August 29, 2019

We investigated the feasibility of using N-isopropylacrylamide (NIPAM) dosimeters with x-ray CT to verify radiosurgery dose. Dosimeters were prepared at one facility and shipped to a second facility for irradiation. A simulation CT was acquired and plans prepared for a 4 field box, and a 4 arc VMAT radiosurgery plan to 6 targets with 1cm diameter. Each dosimeter was aligned via CBCT and irradiated, followed by 5 diagnostic CTs acquired after >24 hours, which were averaged for analysis. Absolute dose calibration was applied and dose evaluated for both plans. Hounsfield Units were proportional to dose above 10-12Gy. For the 4-field box, mean difference between measured and predicted dose >10Gy was -0.13Gy -1.69Gy and gamma index was <1 for 72% and 65% of voxels using a 5% / 1mm and 3% / 2mm criteria, respectively (threshold = 15Gy, global dose criteria). For the multifocal SRS case, mean dose within each target was within -0.14Gy- 0.55Gy of the expected value, and gamma index was < 1 for 94.0% and 99.5% of voxels, respectively (threshold = 15Gy). NIPAM based 3D dosimetry with x-ray CT is well suited for validating radiosurgery spatial alignment, as well as dose distributions when dose is above 10-12Gy.

Duke Scholars

Published In

Journal of Physics: Conference Series

DOI

EISSN

1742-6596

ISSN

1742-6588

Publication Date

August 29, 2019

Volume

1305

Issue

1

Related Subject Headings

  • 51 Physical sciences
  • 0299 Other Physical Sciences
  • 0204 Condensed Matter Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
 

Citation

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Adamson, J., Carroll, J., Trager, M., Yoon, P., Kodra, J., Yin, F. F., … Jirasik, A. (2019). Feasibility of radiosurgery dosimetry using NIPAM 3D dosimeters and x-ray CT. In Journal of Physics: Conference Series (Vol. 1305). https://doi.org/10.1088/1742-6596/1305/1/012004
Adamson, J., J. Carroll, M. Trager, P. Yoon, J. Kodra, F. F. Yin, E. Maynard, M. Hilts, M. Oldham, and A. Jirasik. “Feasibility of radiosurgery dosimetry using NIPAM 3D dosimeters and x-ray CT.” In Journal of Physics: Conference Series, Vol. 1305, 2019. https://doi.org/10.1088/1742-6596/1305/1/012004.
Adamson J, Carroll J, Trager M, Yoon P, Kodra J, Yin FF, et al. Feasibility of radiosurgery dosimetry using NIPAM 3D dosimeters and x-ray CT. In: Journal of Physics: Conference Series. 2019.
Adamson, J., et al. “Feasibility of radiosurgery dosimetry using NIPAM 3D dosimeters and x-ray CT.” Journal of Physics: Conference Series, vol. 1305, no. 1, 2019. Scopus, doi:10.1088/1742-6596/1305/1/012004.
Adamson J, Carroll J, Trager M, Yoon P, Kodra J, Yin FF, Maynard E, Hilts M, Oldham M, Jirasik A. Feasibility of radiosurgery dosimetry using NIPAM 3D dosimeters and x-ray CT. Journal of Physics: Conference Series. 2019.
Journal cover image

Published In

Journal of Physics: Conference Series

DOI

EISSN

1742-6596

ISSN

1742-6588

Publication Date

August 29, 2019

Volume

1305

Issue

1

Related Subject Headings

  • 51 Physical sciences
  • 0299 Other Physical Sciences
  • 0204 Condensed Matter Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics