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Implementation of the isocenter-shift technique for smoothing MLC field edge on a 3D treatment planning system.

Publication ,  Journal Article
Xue, J; Zhang, P; Wu, J; Wang, Z; Sibata, C
Published in: Med Phys
July 2002

Stepped leaf edges are the major limitation of conforming to the prescribed treatment contour defined by the conventional multileaf collimator (MLC), which produces a scalloped dose pattern. The commercial HD-270 MLC (HDI) technique provides a software solution of the conventional MLC to achieve smoothed edge and optimal penumbra of the MLC shaped field. We implemented the HDI functionality on a 3D treatment planning system and compared the dosimetric effects of the HDI delivery in simulation with those in experiment for a number of the MLC fields. The fields from the contour of varied shapes with different sizes of the leaf stepping were tested for the HDI delivery. There is a good agreement of the dose distribution between the calculation as implemented in the planning system and the measurement performed on the treatment machine. It has been shown that the HDI delivery significantly smooths the stepped field edge with the reduced isodose undulation and effective penumbra. A problem may be present when the HDI is applied for the treatment of the circular contour of smaller diameter, and the conformity of the MLC shaping may not be achievable satisfactorily with the existing system. The optimization of leaf configuration is suggested to improve the conformity of the HDI technique. The HDI planning then can be used to assist in the decision making of applying the HDI treatment delivery.

Duke Scholars

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

July 2002

Volume

29

Issue

7

Start / End Page

1413 / 1420

Location

United States

Related Subject Headings

  • Software
  • Radiotherapy, Conformal
  • Radiotherapy Planning, Computer-Assisted
  • Radiometry
  • Nuclear Medicine & Medical Imaging
  • Models, Theoretical
  • Humans
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Xue, J., Zhang, P., Wu, J., Wang, Z., & Sibata, C. (2002). Implementation of the isocenter-shift technique for smoothing MLC field edge on a 3D treatment planning system. Med Phys, 29(7), 1413–1420. https://doi.org/10.1118/1.1485061
Xue, Jinyu, Pengpeng Zhang, Jackie Wu, Zhiheng Wang, and Claudio Sibata. “Implementation of the isocenter-shift technique for smoothing MLC field edge on a 3D treatment planning system.Med Phys 29, no. 7 (July 2002): 1413–20. https://doi.org/10.1118/1.1485061.
Xue J, Zhang P, Wu J, Wang Z, Sibata C. Implementation of the isocenter-shift technique for smoothing MLC field edge on a 3D treatment planning system. Med Phys. 2002 Jul;29(7):1413–20.
Xue, Jinyu, et al. “Implementation of the isocenter-shift technique for smoothing MLC field edge on a 3D treatment planning system.Med Phys, vol. 29, no. 7, July 2002, pp. 1413–20. Pubmed, doi:10.1118/1.1485061.
Xue J, Zhang P, Wu J, Wang Z, Sibata C. Implementation of the isocenter-shift technique for smoothing MLC field edge on a 3D treatment planning system. Med Phys. 2002 Jul;29(7):1413–1420.

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

July 2002

Volume

29

Issue

7

Start / End Page

1413 / 1420

Location

United States

Related Subject Headings

  • Software
  • Radiotherapy, Conformal
  • Radiotherapy Planning, Computer-Assisted
  • Radiometry
  • Nuclear Medicine & Medical Imaging
  • Models, Theoretical
  • Humans
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis