An anterior appositional electron field technique with a hanging lens block in orbital radiotherapy: A dosimetric study

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · International Journal of Radiation Oncology, Biology and Physics; (United States)

DOI:https://doi.org/10.1016/0360-3016(91)90700-E· OSTI ID:5228021

Borger, F; Rosenberg, I; Vijayakumar, S; Virudachalam, R; Schneider, D; Langmuir, V; Chen, G T ^[1]

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1. Michael Reese/University of Chicago, IL (USA)

A technique for orbital radiotherapy is presented consisting of an anterior, appositional electron beam with a hanging lens block. The beam was modified by introducing two 1.6 mm thick plastic spoilers, at about 3 cm and 15 cm from the lens, to boost in-scattering of electrons under the block. The 9 mm diameter, 2 cm long stainless steel cylindrical block was suspended 0.5-1.0 cm above the eye. The authors performed film, TLD (Thermo Luminescent Dosimetry), and diode dosimetry to determine the dose fill-in behind the lens. The introduction of the spoilers dramatically changed the dose distribution. The maximum dose under the block increased from 66% to 85% of the open field dose. Moreover, the dose to the posterior surface of the globe directly underneath the block, at a depth of 3 cm, increased from 48% to 76% of maximum dose, while the dose to the lens was still below 20%. This is a simple and easily reproducible treatment and is an improvement on a previously described technique. The dose distribution is adequate for cases where the target volume surrounds and is posterior to the globe.

• OSTI ID: 5228021
• Journal Information: International Journal of Radiation Oncology, Biology and Physics; (United States), Journal Name: International Journal of Radiation Oncology, Biology and Physics; (United States) Vol. 21:3; ISSN IOBPD; ISSN 0360-3016
• Country of Publication: United States
• Language: English

Related Subjects

550603* -- Medicine-- External Radiation in Therapy-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
BEAMS
BODY
BODY AREAS
CRYSTALLINE LENS
DOSES
DOSIMETRY
ELECTRON BEAMS
EYES
FACE
HEAD
LEPTON BEAMS
MEDICINE
NUCLEAR MEDICINE
ORGANS
PARTICLE BEAMS
RADIATION DOSE DISTRIBUTIONS
RADIATION DOSES
RADIATION PROTECTION
RADIOLOGY
RADIOTHERAPY
SENSE ORGANS
THERAPY
THERMOLUMINESCENT DOSIMETRY