Measurement of dose distributions using film in therapeutic electron beams.
Med Phys
; 16(6): 911-5, 1989.
Article
em En
| MEDLINE
| ID: mdl-2511400
ABSTRACT
The feasibility of using film dosimetry data as the input data for patient treatment planning was evaluated. The central-axis depth dose and the off-axis ratios obtained from film measurements in a solid phantom were compared with those of ion-chamber measurements in water. Two techniques were used to generate isodose distributions. The first technique used only the film data, i.e., the central-axis depth dose and the off-axis ratios used for the reconstruction were determined from the film optical density (corrected for film nonlinearity). In the second technique, the central-axis depth dose measured by an ion chamber in a water phantom was combined with the off-axis ratios measured using film in the "solid water" phantom. The resulting isodose distributions from both techniques were compared with the ion-chamber measurements in water for 7-, 12-, and 18-MeV electrons, and the second technique showed better agreement with the ion-chamber measurements than did the first technique. The differences were within a clinically acceptable range.
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Base de dados:
MEDLINE
Assunto principal:
Dosagem Radioterapêutica
/
Radioterapia de Alta Energia
/
Elétrons
/
Dosimetria Fotográfica
Idioma:
En
Ano de publicação:
1989
Tipo de documento:
Article