z-logo
Premium
The use of a radiochromic detector for the determination of stereotactic radiosurgery dose characteristics a)
Author(s) -
McLaughlin W. L.,
Soares C. G.,
Sayeg J. A.,
McCullough E. C.,
Kline R. W.,
Wu Andrew,
Maitz A. H.
Publication year - 1994
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.597384
Subject(s) - dosimetry , radiosurgery , densitometer , optics , materials science , dose profile , detector , absorbed dose , nuclear medicine , image resolution , microdensitometer , medical physics , physics , radiation therapy , medicine , radiology
The measurement of absorbed dose as well as dose distributions (profiles and isodose curves) for small radiation fields (as encountered in stereotactic surgery) has been difficult due to the usual large detector size or densitometer aperture (≳1 mm) relative to the radiation field (as small as 4 mm). The radiochromic direct‐imaging film, when read with a scanning laser microdensitometer (laser beam diameter 0.1 mm), overcomes this difficulty and has advantages over conventional film in providing improved precision, better tissue equivalence, greater dynamic range, higher spatial resolution, and room light handling. As a demonstration of suitability, the calibrated radiochromic film has been used to measure the dose characteristics for the 18‐, 14‐, 8‐, and 4‐mm fields from the gamma‐ray stereotactic surgery units at Mayo Clinic and the University of Pittsburgh. Intercomparisons of radiochromic film with conventional methods of dosimetry and vendor‐supplied computational dose planning system values indicate agreement to within ±2%. The dose, dose profiles, and isodose curves obtained with radiochromic film can provide high‐spatial‐resolution information of value for acceptance testing and quality control of dose measurement and/or calculation.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here