Desenvolvimento de uma metodologia para a calibração de instrumentos de medida utilizados no controle da qualidade em radiodiagnóstico intervencional [thesis]

Jurema Aparecida de Miranda
Desenvolvimento de uma metodologia para a calibração de instrumentos de medida utilizados no controle de qualidade em radiodiagnóstico intervencional JUREMA APARECIDA DE MIRANDA Dissertação apresentada como parte dos requisitos para obtenção do Grau de Mestre em Ciências na Área de Tecnologia Nuclear -Aplicações. Orientadora: Dra. Maria da Penha Albuquerque Potiens SÃO PAULO 2009 1,2 x10 -2 e 1,9 x 10 -2 Gy/min para RQC 3, RQC 5, RQC 7 respectivamente. Foram realizados testes sem e com a
more » ... sem e com a colimação posicionada entre a câmara monitora e o simulador e os resultados encontrados mostram uma diferença de +5,5%, +0,6% e +0,8 %. Comprovando a importância da colimação nestes procedimentos intervencionistas. iv Development of a calibration methodology for instruments used to interventional radiology quality control ABSTRACT Interventional radiology is the technique where X radiation images are used as a tool in the conduction of diagnostic or/and therapeutic procedures. The exposition times are long for both procedures, diagnostic and therapeutic, may cause serious injuries in the patient, and also contribute to the dose of the clinical staff. In Brazil there are not yet well established rules to determine the doses and to make the dosimetry in fluoroscopic beams. There is great interest in this study, in relation to the beam quality, the half-value-layer, and others parameters. In this work a Medicor Neo Diagnomax clinical X ray generator, fluoroscopy mode, was used to develop a calibration methodology for instruments used in interventional radiology quality control. One plane parallel ionization chamber PTW was used as monitor. The ionization chambers recommended for fluoroscopy measurements had been evaluated and calibrated in relation to the IPEN Calibration Laboratory reference ionization chamber. The RQR3, RQR5 and RQR7 radiation qualities and the specific ones for fluoroscopy, RQC3, RQC5 and RQC7, were established following the norm IEC 61267. All beams characteristics were determined. Ionization chambers positioning system and the acrylic phantoms to the entrance and exit doses determination were developed and constructed. The results obtained show air kerma rates of 4.5x10 -3 , 1.2x10 -2 and 1.9x10 -2 Gy/min for RQC3, RQC5 and RQC7 respectively. Tests with and without the collimation just after the monitor chamber, were carried out and the results showed a difference of +5.5%, +0.6% e + 0.8%, confirming the importance of the collimation use in these interventionist procedures.
doi:10.11606/d.85.2009.tde-05112009-103703 fatcat:2rwckn6lb5bqxefxy3dymrgtge