Characterization of a CT ionization chamber for radiation field mapping

Perini, Ana Paula; Neves, Lucio Pereira; Vivolo, Vitor; Xavier, Marcos; Khoury, Helen J.; Caldas, Linda V.E.

doi:10.1016/j.apradiso.2011.11.051

Cited by 14 publications

(6 citation statements)

References 7 publications

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“…In the work of Maia and Caldas (2005), a parallel-plate ionization chamber was evaluated in diagnostic radiology radiation qualities and its energy dependence was 2.6%. In the work of Perini et al (2012a), a pencil ionization chamber was characterized in the diagnostic radiology qualities, and presented an energy dependence of 3.0%. The correction factors were obtained normalizing the calibration coefficient obtained in each quality to the calibration coefficient of the RQR5 radiation quality.…”

Section: Calibration and Energy Dependencementioning

confidence: 99%

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Investigation of the applicability of a special parallel-plate ionization chamber for x-ray beam dosimetry

Perini

Neves

Caldas

2014

Radiation Physics and Chemistry

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Section: Calibration and Energy Dependencementioning

confidence: 99%

“…At the Calibration Laboratory of the IPEN (LCI) some ionization chambers were designed and developed for diagnostic radiology (Perini et al, 2012a) and radiotherapy (Neves et al, 2012). These ionization chambers presented satisfactory results to be applied in calibration laboratories and medical clinics.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the applicability of a special parallel-plate ionization chamber for x-ray beam dosimetry

Perini

Neves

Caldas

2014

Radiation Physics and Chemistry

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“…Estas diferenças estão relacionadas ao material que ela foi constituída e à disposição geométrica de seus componentes. Esta câmara de ionização já foi avaliada para dosimetria de feixes padrões de TC, com resultados dentro das normas internacionais [3,4].…”

Section: Introductionunclassified

“…Figura 1: Câmara de ionização tipo lápis avaliada neste trabalho (a) e esquema do volume sensível, com os materiais constituintes (b). Figura modificada de[3].…”

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Aplicação Do Método De Monte Carlo Para Avaliação De Uma Câmara De Ionização Tipo Lápis Especial

Mendonça¹,

Neves²,

Santos³

et al. 2016

Simpósio De Engenharia Biomédica

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Uma câmara de ionização tipo lápis especial, foi avaliada para determinar a influência de seus componentes em sua resposta, para feixes padrões diretos de raios X. Para este propósito, empregou-se o método de Monte Carlo e um espectro padrão de radiodiagnóstico (RQR5). Os resultados obtidos mostram que, embora, esta câmara de ionização tipo lápis tenha sido fabricada para dosimetria de tomografia computadorizada, ela também pode ser empregada para dosimetria de feixes padrões de radiodiagnóstico. Isto se deve ao fato de que não houve influência significativa dos componentes da câmara de ionização na sua resposta, quando esta foi irradiada com feixes de radiodiagnóstico. Palavras-chave: Câmara de ionização, simulação de Monte Carlo, feixe padrão de radiodiagnóstico.

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“…In order to construct an ionization chamber that attend the characteristics of an ideal dosimeter with requirements for a work standard, in this work the development and characterization of a new plane-parallel ionization chamber to be utilized in low-energy X-ray beam qualities for radiotherapy is presented. The main motivation for the development and characterization of this new ionization chamber was the possibility of its utilization at the Calibration Laboratory of IP-EN (LCI) as a work standard; and, besides that, the LCI group presents a previous knowledge in the development of ionization chambers for use in diagnostic radiology and radiotherapy energy ranges [11,12]. Furthermore, the ionization chamber designed and developed in this work was planned to be a radiation detector of low cost, easy to assemble, robust, and utilizing only easily commercially available Brazilian materials.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a plane-parallel ionization chamber for low-energy radiotherapy beams

et al. 2015

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A plane-parallel ionization chamber, with a sensitive volume of 6.3 cm 3 , developed at the Calibration Laboratory of IPEN (LCI), was utilized to verify the possibility of its application in low-energy X-ray beam qualities for radiotherapy (T-qualities). This homemade ion chamber was manufactured using polymethyl methacrylate (PMMA) coated with graphite, and co-axial cables. In order to evaluate the performance of this ionization chamber, some characterization tests were performed: short-and medium-term stability, leakage current, saturation, ion collection efficiency, polarity effect and linearity of response. The maximum value obtained in the short-term stability test was 0.2%, in accordance with the limit value of 0.3% provided by the IEC 60731 standard. The saturation curve was obtained varying the applied voltage from -400 V to +400 V, in steps of 50 V, using the charge collecting time of 20 s. From the saturation curve two other characteristics were analyzed: the polarity effect and the ion collection efficiency, with results within the international recommendations. The leakage current of the ionization chamber was measured in time intervals of 20 minutes, before and after its irradiations, and all the results obtained were in agreement with the IEC 60731 standard. The linearity of response was verified utilizing the T-50(b) radiation quality, and the ionization chamber was exposed to different air kerma rates. The response of the ionization chamber presented a linear behavior. Therefore, all results were considered satisfactory, within international recommendations, indicating that this homemade ionization chamber presents potential routine use in dosimetry of low-energy radiotherapy beams.

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Characterization of a CT ionization chamber for radiation field mapping

Cited by 14 publications

References 7 publications

Investigation of the applicability of a special parallel-plate ionization chamber for x-ray beam dosimetry

Investigation of the applicability of a special parallel-plate ionization chamber for x-ray beam dosimetry

Aplicação Do Método De Monte Carlo Para Avaliação De Uma Câmara De Ionização Tipo Lápis Especial

Evaluation of a plane-parallel ionization chamber for low-energy radiotherapy beams

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