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Revista chilena de radiología

On-line version ISSN 0717-9308

Abstract

SERRA H., Andrea et al. Typical dose values for brain computed tomography in adult patients. Rev. chil. radiol. [online]. 2020, vol.26, n.1, pp.25-31. ISSN 0717-9308.  http://dx.doi.org/10.4067/S0717-93082020000100025.

Due to the increase in the use of Computed Tomography (CT), and consequently, the probability of generating a progressive increase in the dose received by the patient and its relationship in the potential risk of the effects of ionizing radiation, it is important to implement the use of diagnostic reference levels (DRLs) in CT, as a fundamental tool within a quality control program that allows the evaluation and optimization of the doses delivered to patients according to the desired clinical task. In order to establish typical dose values in brain CT at Bupa Reñaca Clinic, a sample of 73 dosimetric reports generated on a Toshiba Aquilion 64 CT unit was studied, in terms of dose indicators for CT: Dose rate on CT by volume (CTDIvol) and Dose Length Product (DLP). With the data obtained, the value of the 50th percentile (p50) for each dose indicator was estimated, and typical dose values were determined in each group studied according to sex, age and clinical indication. It was possible to define and establish a methodology that allowed obtaining typical dose values for brain CT, optimizing the doses without producing a decrease in the image quality necessary for our clinical purpose.

Keywords : Brain computed tomography; Diagnostic reference levels; Optimization of the dose; Radiation dose; Typical dose value.

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