Clinical use of a wing field with transmission block for the treatment of the pelvis including the inguinal node

A. M. Kalend, T. L. Park, A. Wu, Shalom Kalnicki, A. G. Meek, W. D. Bloomer, E. L. Solowsky

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Treatment planning of photon and electron beams to include the pelvis and the groin poses a technical difficulty of positioning beams, and a dosimetric problem of abutting fields at the groin. We have analyzed a simpler AP/PA method using a central transmission method using a central transmission block. The posterior portal is smaller and opposes only the pelvic portion of the anterior portal under the transmission block, while the anterior extended portion (hence the wing) is unattenuated to treat the inguinal region. By calculating the attenuation thickness according to the patient's separation and the beam quality, the dose distribution is tailored to yield the proper dose to the pelvic mid-plane and the inguinal nodes while minimizing the dose to the femora. Measured dose distribution (6MV) using film dosimetry in a tissueequivalent phantom indicates that a 30% hot spot is created by the posterior portal diverging into the wings of the anterior field. Therefore, the pelvic ateenuator is tapered at its lateral edges, thereby significantly reduced the dose inhomogeneity (5%) at the groin. Clinical methods are outlined for the verification of the patient portal films against possible mismatch in beam divergence.

Original languageEnglish (US)
Pages (from-to)153-158
Number of pages6
JournalInternational Journal of Radiation Oncology, Biology, Physics
Volume19
Issue number1
DOIs
StatePublished - 1990
Externally publishedYes

Fingerprint

pelvis
Groin
Pelvis
wings
dosage
Film Dosimetry
Therapeutics
femur
photon beams
Photons
Femur
positioning
dosimeters
planning
divergence
inhomogeneity
attenuation
electron beams
Electrons

Keywords

  • Inguinal node irradiation
  • Pelvic wing field
  • Transmission block

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Radiation

Cite this

Clinical use of a wing field with transmission block for the treatment of the pelvis including the inguinal node. / Kalend, A. M.; Park, T. L.; Wu, A.; Kalnicki, Shalom; Meek, A. G.; Bloomer, W. D.; Solowsky, E. L.

In: International Journal of Radiation Oncology, Biology, Physics, Vol. 19, No. 1, 1990, p. 153-158.

Research output: Contribution to journalArticle

Kalend, A. M. ; Park, T. L. ; Wu, A. ; Kalnicki, Shalom ; Meek, A. G. ; Bloomer, W. D. ; Solowsky, E. L. / Clinical use of a wing field with transmission block for the treatment of the pelvis including the inguinal node. In: International Journal of Radiation Oncology, Biology, Physics. 1990 ; Vol. 19, No. 1. pp. 153-158.
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