caa a22 4500 397501617 CHVBK 20180308164533.0 cr unu---uuuuu 161202e19950101xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082566 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082566 Dose Profile and Dose Index Analysis in Computed Tomography [Elektronische Daten] [A.D. Oliveira, J.G. Alves, A.F. Carvalho, J.V. Carreiro] A function to describe the dose profile in Computed Tomography (CT) beams is presented. To measure the dose profile free-in-air a set of 20 thermoluminescence dosemeters was used. The symmetry or asymmetry, left and right penumbrae, length of the plateau and full width at half maximum (FWHM) are function parameters, determined with the fit to the TLD data, allowing a thorough characterisation of the beam. A new CTDI is defined using the FWHM instead of the nominal slice thickness, which is physically the correct normalising factor, producing a more precise figure for the dose evaluation. In addition, a plateau dose is defined, and these two dose descriptors are discussed and compared. Radiation Protection Dosimetry Oliveira A.D. aut Alves J.G. aut Carvalho A.F. aut Carreiro J.V. aut Radiation Protection Dosimetry Oxford University Press 57/1-4(1995-01-01), 387-391 0144-8420 57:1-4<387 1995 57 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082566 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082566 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Oliveira A.D. aut NATIONALLICENCE 700 1- Alves J.G. aut NATIONALLICENCE 700 1- Carvalho A.F. aut NATIONALLICENCE 700 1- Carreiro J.V. aut NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 57/1-4(1995-01-01), 387-391 0144-8420 57:1-4<387 1995 57 rpd Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford