Dosimetric implication of multileaf collimator leaves for abutting, half beam blocking and intensity modulation

I. J. Das, A. Kassaee, R. K. Mitra, D. I. Rosenthal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Dosimetry related to inter and intra-leaf leakage has been reported for every type of multileaf collimator (MLC), however, dosimetry at the abutting MLC leaves that are frequent in intensity modulated radiation therapy (IMRT) as well as for half beam blocked fields in conjunction with dynamic and virtual wedges has not been reported. In this study, dosimetric significance of MLC leaves for abutting and half beam blocked field is evaluated for the curved and focused MLCs (Varian and Siemens) at leaves position of 0, ±0.1, ±0.2, ±0.3, ±0.5, ±1.0, ±5 and ±10 cm in 0° and 90° gantry angle using CEA film. Films were exposed by blocking one side of the MLC leaves and second exposure with blocking the other half. Films were scanned using laser film densitometer. Results show that Varian MLC produces significant hot spot (40%) in a star pattern due to curved leaves design and depends strongly on the gantry position. The 90° gantry position provides relatively uniform dose probably due to sagging of the leaves. The Siemens MLC provides random cold and hot spots in the range of ±20% independent of the gantry angle. The width of the abutting hot and cold spots is

Original languageEnglish (US)
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
EditorsJ.D. Enderle
Pages2202-2204
Number of pages3
Volume3
StatePublished - 2000
Externally publishedYes
Event22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Chicago, IL, United States
Duration: Jul 23 2000Jul 28 2000

Other

Other22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society
CountryUnited States
CityChicago, IL
Period7/23/007/28/00

Fingerprint

Modulation
Dosimetry
Densitometers
Radiotherapy
Stars
Lasers

Keywords

  • Abutting fields
  • IMRT
  • MLC

ASJC Scopus subject areas

  • Bioengineering

Cite this

Das, I. J., Kassaee, A., Mitra, R. K., & Rosenthal, D. I. (2000). Dosimetric implication of multileaf collimator leaves for abutting, half beam blocking and intensity modulation. In J. D. Enderle (Ed.), Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings (Vol. 3, pp. 2202-2204)

Dosimetric implication of multileaf collimator leaves for abutting, half beam blocking and intensity modulation. / Das, I. J.; Kassaee, A.; Mitra, R. K.; Rosenthal, D. I.

Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. ed. / J.D. Enderle. Vol. 3 2000. p. 2202-2204.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Das, IJ, Kassaee, A, Mitra, RK & Rosenthal, DI 2000, Dosimetric implication of multileaf collimator leaves for abutting, half beam blocking and intensity modulation. in JD Enderle (ed.), Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. vol. 3, pp. 2202-2204, 22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Chicago, IL, United States, 7/23/00.
Das IJ, Kassaee A, Mitra RK, Rosenthal DI. Dosimetric implication of multileaf collimator leaves for abutting, half beam blocking and intensity modulation. In Enderle JD, editor, Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. Vol. 3. 2000. p. 2202-2204
Das, I. J. ; Kassaee, A. ; Mitra, R. K. ; Rosenthal, D. I. / Dosimetric implication of multileaf collimator leaves for abutting, half beam blocking and intensity modulation. Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings. editor / J.D. Enderle. Vol. 3 2000. pp. 2202-2204
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