Radiation protection in medical imaging is central in terms of an optimized benefit/risk ratio for patients being examined but also for the medical staff especially for interventional procedures. Over the last years there has been a large effort to reduce patient exposure and improve diagnostic accuracy when applying ionizing based medical imaging technologies. For all approaches it must be guaranteed, that while using as low exposure as possible it is mandatory to keep the diagnostically relevant image quality. It is difficult to predict changes in...

There are various approaches to try to cope with these demands:- one can perform receiver operating studies (like in 1) or other studies looking for subjective image quality descriptors based on imaging tasks. The big challenge in this case would be to have a sufficient subtle ground truth to detect deficiencies in methods. Besides of this, such studies are very time consuming and need a lot of effort to achieve relevant results. Looking for physics based, objective approaches to determine image quality- one can look...

There are various papers being presented over the last years from various groups describing different approaches for determining image quality parameters for which some examples had been given in the methods section. Many of such papers are looking into computed tomography imaging nowadays which does make sense due to the relatively high exposure correlated with threedimensional imaging using ionising radiation on the one hand side and the broad use of applications on the other hand. In addition there is currently a lot of effort ongoing...

Image quality assessment is a very important tool when talking about optimising benefit/risk ratios for diagnostic imaging using ionising radiation. The iamge quality really needs to be evaluated in parallel with the dose that is applied during an imaging procedure, otherwise the dose could be reduced up to a point where relevant information is lost and thus the diagnostic performance is deteriorated. A large variety of tools is existing for the task of image quality assessment. The various different methods have been evaluated regarding their...

1.) V. Prendki, M. Scheffler, B. Huttner, N. Garin, F. Herrmann, J.-P. Janssens, C. Marti, S. Carballo, X. Roux, C. Serratrice, J. Serratrice, T. Agoritsas, C. Becker, L. Kaiser, S. Rosset-Zufferey, V. Soulier, A. Perrier, J.-L. Reny, X. Montet, J. Stirnemann, Jérôme. (2018). Low-dose CT for the diagnosis of pneumonia in elderly patients: a prospective, interventional cohort study. European Respiratory Journal. 51. 1702375. 10.1183/13993003.02375-2017. 2.) H. H. Barrett, K. J. Myers, C. Hoeschen, M. A. Kupinski, M. P. Little; Task-based measures of image quality and...

C. Hoeschen: Nothing to disclose G. Frija: Nothing to disclose K. Katsari: Nothing to disclose D. A. Koff: Nothing to disclose J. Damilakis: Nothing to disclose R. W. Loose: Nothing to disclose J. Santos: Nothing to disclose M. van Straten: Nothing to disclose I. Kralik: Nothing to disclose F. Kainberger: Nothing to disclose M. Kupinski: Nothing to disclose D. K. Tsetis: Nothing to disclose C. Granata: Nothing to disclose S. Schindera: Nothing to disclose D. Tack: Nothing to disclose P. H. Hogg: Nothing to disclose