Performance of three pencil-type ionization chambers (10 cm) in computed tomography standard beams

8th Brazilian Congress on Metrology

De Castro, Maysa C.^1 ; Xavier, Marcos^1 ; Caldas, Linda V.E.^1

Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN-SP), Av. Professor Lineu Prestes, 2242, São Paulo

SPSP

05508-000, Brazil^1

关键词: Characterization tests;    CT-beams;    Ion collection efficiencies;    Linearity of response;    Polarity effect;    Quality control tests;    Saturation curve;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/733/1/012091/pdf
DOI  :  10.1088/1742-6596/733/1/012091

来源: IOP

【 摘 要 】

The use of computed tomography (CT) has increased over the years, thus generating a concern about the doses received by patients undergoing this procedure. Therefore, it is necessary to perform routinely beam dosimetry with the use of a pencil-type ionization chamber. This detector is the most utilized in the procedures of quality control tests on this kind of equipment. The objective of this work was to perform some characterization tests in standard CT beams, as the saturation curve, polarity effect, ion collection efficiency and linearity of response, using three ionization chambers, one commercial and two developed at the IPEN.