caa a22 4500 397504241 CHVBK 20180308164540.0 cr unu---uuuuu 161202e19950101xx s 000 0 eng 10.1093/oxfordjournals.rpd.a082554 doi 0144-8420 pii (NATIONALLICENCE)oxford-10.1093/oxfordjournals.rpd.a082554 Quality Control in Computed Tomography Performed in Portugal and Denmark [Elektronische Daten] [A.F. Carvalho, A.D. Oliveira, J. Alves, J.V. Carreiro, L.C. Jensen, K.A. Jessen] Quality Control (QC) in Computed Tomography is often performed by the representative of the manufacturer, usually under a service contract. This is the situation for 97% in Portugal and for 90% of all systems in Denmark. This paper monitors relevant image and dose parameters before and after monthly service with the aim of evaluating the necessity of additional QC tests to be carried out by the user's operator. For this purpose two parallel series of QC have been carried out in Portugal and in Denmark. The CT systems studied are different models and have service and maintenance once a month. The QC tests were performed by phantom and dose measurements before and after each monthly maintenance. It is concluded from both series that the constancy of the scanner performance is high, and that the monthly service practised by most manufacturers seems sufficient and that extra QA tests would not improve performance. A daily check of the noise level should be recommended and a registration of this parameter should be performed. For comparison it is important that the parameters measured are well defined. Special concern should be given to the proper use of the dose descriptor to avoid confusion. The various dose descriptions in use have been tested, and discrepancies are registered when shaped filters are presented in a scanner system. This is in accordance with earlier findings. Radiation Protection Dosimetry Carvalho A.F. aut Oliveira A.D. aut Alves J. aut Carreiro J.V. aut Jensen L.C. aut Jessen K.A. aut Radiation Protection Dosimetry Oxford University Press 57/1-4(1995-01-01), 333-337 0144-8420 57:1-4<333 1995 57 rpd https://doi.org/10.1093/oxfordjournals.rpd.a082554 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.rpd.a082554 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Carvalho A.F. aut NATIONALLICENCE 700 1- Oliveira A.D. aut NATIONALLICENCE 700 1- Alves J. aut NATIONALLICENCE 700 1- Carreiro J.V. aut NATIONALLICENCE 700 1- Jensen L.C. aut NATIONALLICENCE 700 1- Jessen K.A. aut NATIONALLICENCE 773 0- Radiation Protection Dosimetry Oxford University Press 57/1-4(1995-01-01), 333-337 0144-8420 57:1-4<333 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