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Point dose verification for intensity modulated radiosurgery using Clarkson's method.

Publication ,  Journal Article
Zhu, J; Yin, F-F; Kim, JH
Published in: Med Phys
August 2003

In clinical radiation physics chart checking, the dose calculation results generated by computer treatment planning software are usually verified by an independent computerized monitor unit calculation routine, or by "hand calculation" using percent depth dose (PDD), tissue phantom ratio (TPR), scatter factors, and the machine calibration factors. For intensity-modulated radiosurgery (IMRS) or intensity-modulated radiation therapy (IMRT), the "hand calculation" becomes not feasible due to the sophisticated multileaf collimator (MLC) segments created for intensity-modulated dose delivery. Therefore, an independent computerized dose calculation routine is needed for fast and reliable dose verification. In this work, a point dose calculation routine for IMRS/IMRT plan verification is developed by directly applying Clarkson's method. The method includes preparing data table by measuring TPRs for circular fields with diameters ranging 6 to 98 mm, extrapolating TPR for the zero field size (TPR0) from measured data and generating scatter phantom ratio (SPR) for each individual circular field. The segmented MLC sequences created by IMRS/IMRT inverse planning are converted into irregular fields for Clarkson's calculation. This method has been tested using 29 IMRS/IMRT cases. The results indicate that it is reliable, fast, and accurate. The average time to calculate one field is about 2 s with a 300 Mhz CPU.

Duke Scholars

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

August 2003

Volume

30

Issue

8

Start / End Page

2218 / 2221

Location

United States

Related Subject Headings

  • Scattering, Radiation
  • Radiotherapy, Conformal
  • Radiotherapy, Computer-Assisted
  • Radiotherapy Planning, Computer-Assisted
  • Radiotherapy Dosage
  • Radiosurgery
  • Phantoms, Imaging
  • Particle Accelerators
  • Nuclear Medicine & Medical Imaging
  • Models, Statistical
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Zhu, J., Yin, F.-F., & Kim, J. H. (2003). Point dose verification for intensity modulated radiosurgery using Clarkson's method. Med Phys, 30(8), 2218–2221. https://doi.org/10.1118/1.1589495
Zhu, Jingeng, Fang-Fang Yin, and Jae Ho Kim. “Point dose verification for intensity modulated radiosurgery using Clarkson's method.Med Phys 30, no. 8 (August 2003): 2218–21. https://doi.org/10.1118/1.1589495.
Zhu J, Yin F-F, Kim JH. Point dose verification for intensity modulated radiosurgery using Clarkson's method. Med Phys. 2003 Aug;30(8):2218–21.
Zhu, Jingeng, et al. “Point dose verification for intensity modulated radiosurgery using Clarkson's method.Med Phys, vol. 30, no. 8, Aug. 2003, pp. 2218–21. Pubmed, doi:10.1118/1.1589495.
Zhu J, Yin F-F, Kim JH. Point dose verification for intensity modulated radiosurgery using Clarkson's method. Med Phys. 2003 Aug;30(8):2218–2221.

Published In

Med Phys

DOI

ISSN

0094-2405

Publication Date

August 2003

Volume

30

Issue

8

Start / End Page

2218 / 2221

Location

United States

Related Subject Headings

  • Scattering, Radiation
  • Radiotherapy, Conformal
  • Radiotherapy, Computer-Assisted
  • Radiotherapy Planning, Computer-Assisted
  • Radiotherapy Dosage
  • Radiosurgery
  • Phantoms, Imaging
  • Particle Accelerators
  • Nuclear Medicine & Medical Imaging
  • Models, Statistical