Prog Med Phys.  2012 Dec;23(4):234-238.

Evaluation of the Radiochromic Film Dosimetry for a Small Curved Interface

Affiliations
  • 1Department of Radiation Oncology, Hallym University College of Medicine, Seoul, Korea. sophia@hallym.or.kr

Abstract

A tumor on the eyelid is often treated using a high-energy electron beam, with a metallic eye shield inserted between the eyelid and the eyeball to preserve the patient's sight. Pretreatment quality assurance of the inner eyelid dose on the metallic shield requires a very small dosimetry tool. For enhanced accuracy, a flexible device fitting the curved interface between the eyelid and the shield is also required. The radiochromic film is the best candidate for this device. To measure the doses along the curved interface and small area, a 3-mm-wide strip of EBT2 film was inserted between the phantom eyelid and the shield. After irradiation with 6 MeV electron beams, the film was evaluated for the dose profile. An acrylic eye shield of the same size as the real eye shield was machined, and CT images free from metal artifacts were obtained. Monte Carlo simulation was performed on the CT images, taking into account eye shield material, such as tungsten, aluminum, and steel. The film-based interface dose distribution agreed with the MC calculation within 2.1%. In the small (millimeter scale) and curved region, radiochromic film dosimetry promises a satisfactory result with easy handling.

Keyword

Radiochromic films; Monte Carlo calculation; Small field; Interface dose

MeSH Terms

Aluminum
Artifacts
Electrons
Eye
Eyelids
Film Dosimetry
Handling (Psychology)
Steel
Tungsten
Aluminum
Steel
Tungsten
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