Publicações científicas

Polarized dosimetry method for Gafchromic EBT3

Pérez Azorin JF (1), Garcia LI [ES] (2), Ozcoidi DM (3), Almansa JF (4).
(1) Medical Physics Department, Hospital Universitario de Cruces, Plz. Cruces, Barakaldo, Spain.
(2) Department of Oncology, Clínica Universidad de Navarra, University of Navarra, Av Pio XII s/n, Pamplona, Navarre, Spain.
(3) Department of Applied Mathematics and Physics, Universidad de Navarra, Av Pio XII s/n, Pamplona, Navarre, Spain.
(4) Medical Physics Department, Hospital Universitario Virgen de las Nieves, Av de las Fuerzas Armadas, Granada, Spain.

Revisão:Physica Medica

Data: 30/Jul/2016

Radiofísica [ES] Oncologia Radioterapêutica

PURPOSE:
To analyze the changes in the polarization state of the flatbed scanner light caused by the EBT3 films and to propose a new method for correcting the lateral effects.

METHODS AND MATERIALS:
The polarization changes induced by radiochromic films are analyzed using linear polarizing film. Based on the results, the linear polarizing films are used in the scanning process of the EBT3 films. This method is tested against the conventional EBT3 dosimetry using a series of simple regular beams and 21 cases of IMRT.

RESULTS:
The mean results are statically different from the conventional dosimetry with EBT3. Depending on the transmission axis of the polarizing sheet, the results are better or worse compared to conventional dosimetry EBT3 film. When the transmission axis of the polarizing sheet is parallel to the coating direction, the dosimetry results are better and its variability is smaller. However, when the polarizer transmission axis is perpendicular to the coating direction, results are worse as well as its variability.

CONCLUSION:
Using a polarized film with the polarization axis parallel to the coating direction of the radiochromic film, and preferably above it, significantly improves the dosimetry results and is an easy and inexpensive way to correct the lateral artifacts of the conventional EBT3 dosimetry.

CITAÇÃO DO ARTIGO  Phys Med. 2016 Jul 30. pii: S1120-1797(16)30125-9. doi: 10.1016/j.ejmp.2016.06.013

talvezlhe interesse

QUE TECNOLOGIA UTILIZAMOS? 

A Clínica é o hospital privado com maiores recursos tecnológicos de Espanha, tudo num único centro.

Imagen de un PET, tecnología de vanguardia en la Clínica Universidad de Navarra

OS NOSSOS
PROFISSIONAIS

Os profissionais da Clínica realizam um trabalho contínuo de investigação e formação, sempre em benefício do paciente.

Imagen profesionales de la Clínica Universidad de Navarra

RAZÕES PARA VIR
À CLÍNICA

Conheça porque é que somos diferentes em relação a outros centros sanitários. Qualidade, rapidez, comodidade e resultados.

Imagen del edificio de la Clínica Universidad de Navarra