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[en] In January 2020, the Austrian legislature worked intensively on the complete implementation of Directive 2013/59 /Euratom into national law - the publication of the new version of the Austrian Radiation Protection Act and the associated ordinances is imminent. Fortunately, for the organization of radiation protection within companies revolutionary news are not expected yet.
[de]Im Januar 2020 arbeitete die österreichische Legislative (weiterhin) mit Hochdruck an der vollständigen Umsetzung der Richtlinie 2013/59 /Euratom in nationales Recht - die Publikation der Neufassung des österreichischen Strahlenschutzgesetzes und der zugehörigen Verordnungen steht unmittelbar bevor. Für die Organisation des Strahlenschutzes innerhalb von Betrieben sind glücklicherweise aller Voraussicht noch keine umwälzenden Neuigkeiten zu erwarten.
[en] PET/CT devices almost exclusively use the setting parameters of the CT for the sake of high-quality resolution which is not justified in every case. This poses the question, how far the setting parameters of the CT (particularly voltage and current) can be lowered in order to reduce patient dose while at the same time preserving a clinical useful attenuation correction. This paper presents the results of a series of measurements, which were carried out with a Siemens Biograph 6 PET/CT Scanner and an optimized NEMA PET body phantom that consists on eight hollow acrylic cylinders and several bones (two thighbones, three backbone segments and two pelvic bone parts). First, the CT scanned the phantom varying the voltage (130 kV, 110 kV and 80 kV) and using four different current-time-products (ranging from 8 mAs to 138 mAs). Afterwards the phantom was filled with F-18, whereas the cylinders, due to NEMA conditions - received eight times more F-18 than the remaining phantom volume. A PET-scan was performed with and without attenuation correction based on a CT-scan. The results demonstrate that the setting parameters have little to no effect on the quantitative output of the attenuation correction, hence the calculated activity concentration. Therefore a reduction of both current-time-product and voltage are justified for the sake of lowering the effective dose to the patient for medical examinations where a high-quality resolution is not unconditionally necessary. Finally, in order to avoid unnecessary exposure but to keep a useful attenuation correction, guidelines are presented for the adjustment of voltage and current-time-product. (author)
[en] First, a comprehensive survey is given on the development and the present situation of radiation protection education and training, followed by exemplary reports from the individual countries Germany, Switzerland, Austria and the Netherlands. (orig.)