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Radiologia Brasileira

On-line version ISSN 1678-7099

Abstract

OLIVEIRA, Bruno Beraldo; MOURAO, Arnaldo Prata  and  SILVA, Teógenes Augusto da. Estimation of MSAD values in computed tomography scans using radiochromic films. Radiol Bras [online]. 2013, vol.46, n.2, pp.96-100. ISSN 1678-7099.  http://dx.doi.org/10.1590/S0100-39842013000200013.

OBJECTIVE: To evaluate the feasibility of using radiochromic films as an alternative dosimeter to estimate the multiple scan average dose on the basis on kerma profiles. MATERIALS AND METHODS: The radiochromic films were distributed in cylinders positioned in the center and in four peripheral bores of a standard abdominal phantom utilized for computed tomography dosimetry. RESULTS: Values for multiple scan average dose values corresponded to 13.6 ± 0.7, 13.5 ± 0.7 and 18.7 ± 1.0 mGy for pitch of 0.75, 1.00 and 1.50, respectively. CONCLUSION: In spite of results showing lower values than the reference level for radiodiagnosis (25 mGy) established by the Brazilian regulations for abdominal studies, it is suggested that there is room to optimize procedures and review the reference level for radiodiagnosis in Brazil.

Keywords : Kerma profiles; Computed tomography; Radiochromic films; MSAD.

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