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A technique of automating compensator design for lung inhomogeneity correction using an electron portal imaging device.

Publication ,  Journal Article
Yin, FF; Schell, MC; Rubin, P
Published in: Med Phys
November 1994

A technique of automating compensator design for lung inhomogeneity correction using an electron portal imaging device (EPID) has been investigated. This technique utilizes exit-radiation information as detected by an EPID to determine the thickness of the compensator desired. In this particular study, the compensator thickness is determined to provide a uniform gray-level distribution (related to uniform exit-dose distribution) in the region of the portal image to be compensated. Initially, a compensation characteristic curve, which relates the compensator thickness to the pixel value of the electronic portal image, is measured for both the Lead and Lipowitz compensator materials and a 6-MV photon beam. Then, a chest-treatment field is simulated using an anthropomorphic phantom. Based on the analysis of the profile (gray-level distribution) across the lung and mediastinum regions in the electronic portal image, the average of pixel values within the mediastinum region is selected as the matching level and the regions to be compensated are determined. With the aid of the predetermined compensation characteristic curve and proper distance scaling, the compensator thickness at each pixel location is automatically calculated at the block tray level to correct lung inhomogeneity. In a simple test using a single anterioposterior (AP) chest field, the compensated profile in the electronic portal image presents a uniform gray-level distribution (related to uniform exit dose) compared to the uncompensated profile.(ABSTRACT TRUNCATED AT 250 WORDS)

Duke Scholars

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

November 1994

Volume

21

Issue

11

Start / End Page

1729 / 1732

Location

United States

Related Subject Headings

  • Radiotherapy, High-Energy
  • Radiotherapy Planning, Computer-Assisted
  • Radiotherapy Dosage
  • Nuclear Medicine & Medical Imaging
  • Models, Structural
  • Mediastinum
  • Lung Neoplasms
  • Lung
  • Humans
  • Biophysics
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Yin, F. F., Schell, M. C., & Rubin, P. (1994). A technique of automating compensator design for lung inhomogeneity correction using an electron portal imaging device. Med Phys, 21(11), 1729–1732. https://doi.org/10.1118/1.597273
Yin, F. F., M. C. Schell, and P. Rubin. “A technique of automating compensator design for lung inhomogeneity correction using an electron portal imaging device.Med Phys 21, no. 11 (November 1994): 1729–32. https://doi.org/10.1118/1.597273.
Yin, F. F., et al. “A technique of automating compensator design for lung inhomogeneity correction using an electron portal imaging device.Med Phys, vol. 21, no. 11, Nov. 1994, pp. 1729–32. Pubmed, doi:10.1118/1.597273.

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

November 1994

Volume

21

Issue

11

Start / End Page

1729 / 1732

Location

United States

Related Subject Headings

  • Radiotherapy, High-Energy
  • Radiotherapy Planning, Computer-Assisted
  • Radiotherapy Dosage
  • Nuclear Medicine & Medical Imaging
  • Models, Structural
  • Mediastinum
  • Lung Neoplasms
  • Lung
  • Humans
  • Biophysics