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A technique for on-board CT reconstruction using both kilovoltage and megavoltage beam projections for 3D treatment verification.

Publication ,  Journal Article
Yin, F-F; Guan, H; Lu, W
Published in: Med Phys
September 2005

The technologies with kilovoltage (kV) and megavoltage (MV) imaging in the treatment room are now available for image-guided radiation therapy to improve patient setup and target localization accuracy. However, development of strategies to efficiently and effectively implement these technologies for patient treatment remains challenging. This study proposed an aggregated technique for on-board CT reconstruction using combination of kV and MV beam projections to improve the data acquisition efficiency and image quality. These projections were acquired in the treatment room at the patient treatment position with a new kV imaging device installed on the accelerator gantry, orthogonal to the existing MV portal imaging device. The projection images for a head phantom and a contrast phantom were acquired using both the On-Board Imager kV imaging device and the MV portal imager mounted orthogonally on the gantry of a Varian Clinac 21EX linear accelerator. MV projections were converted into kV information prior to the aggregated CT reconstruction. The multilevel scheme algebraic-reconstruction technique was used to reconstruct CT images involving either full, truncated, or a combination of both full and truncated projections. An adaptive reconstruction method was also applied, based on the limited numbers of kV projections and truncated MV projections, to enhance the anatomical information around the treatment volume and to minimize the radiation dose. The effects of the total number of projections, the combination of kV and MV projections, and the beam truncation of MV projections on the details of reconstructed kV/MV CT images were also investigated.

Duke Scholars

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

September 2005

Volume

32

Issue

9

Start / End Page

2819 / 2826

Location

United States

Related Subject Headings

  • Tomography, X-Ray Computed
  • Radiotherapy Planning, Computer-Assisted
  • Radiographic Image Interpretation, Computer-Assisted
  • Radiographic Image Enhancement
  • Phantoms, Imaging
  • Particle Accelerators
  • Nuclear Medicine & Medical Imaging
  • Humans
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
 

Citation

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ICMJE
MLA
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Yin, F.-F., Guan, H., & Lu, W. (2005). A technique for on-board CT reconstruction using both kilovoltage and megavoltage beam projections for 3D treatment verification. Med Phys, 32(9), 2819–2826. https://doi.org/10.1118/1.1997307
Yin, Fang-Fang, Huaiqun Guan, and Wenkai Lu. “A technique for on-board CT reconstruction using both kilovoltage and megavoltage beam projections for 3D treatment verification.Med Phys 32, no. 9 (September 2005): 2819–26. https://doi.org/10.1118/1.1997307.
Yin, Fang-Fang, et al. “A technique for on-board CT reconstruction using both kilovoltage and megavoltage beam projections for 3D treatment verification.Med Phys, vol. 32, no. 9, Sept. 2005, pp. 2819–26. Pubmed, doi:10.1118/1.1997307.

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

September 2005

Volume

32

Issue

9

Start / End Page

2819 / 2826

Location

United States

Related Subject Headings

  • Tomography, X-Ray Computed
  • Radiotherapy Planning, Computer-Assisted
  • Radiographic Image Interpretation, Computer-Assisted
  • Radiographic Image Enhancement
  • Phantoms, Imaging
  • Particle Accelerators
  • Nuclear Medicine & Medical Imaging
  • Humans
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering