Medical imaging physics covers different modalities such as ultra sound, magnetic resonance tomography, diagnostic nuclear medicine (PET, SPECT), Fluoroscopy (XRF), Angiography (XRA) or CT. Actual research activities in the group can be split into the following fields:
of CT protocols: Optimisation of CT protocols is important
to ensure a sufficient image quality with a radiation exposure as low as
possible. Recently, image quality and radiation exposure (especially dose-length product DLP) are
simultaneously evaluated by the KSA group using the ZHAW elliptical phantom.
Complementary to this information, patient exposure data (CTDI, DLP) from CT
units can be collected automatically by dedicated software such as DIDT or GE DoseWatch. The calibration of the dose indications of the
CT unit can be
checked by a CTDI phantom. In consequence, DLP and CTDI are available for
patients and phantom
measurements for a large variety of clinical protocols and CT units. For the same protocols, image quality data is only available for the phantom measurements. To elaborate a base line for of the CT protocols concerning image quality and dose, the collection of intrinsic image quality of patient scans is required to complete the information needed for a quantitative basis form optimisation. Actual research includes the development of novel phantoms and software algorithm for evaluating low contrast detectability and clinical image quality assessment.
Radiation exposure of mammography and XRF: In collaboration with the Kantonsspital Baden (KSB), the radiation exposure with and without different protective devices is evaluated by dosimetric measurements and Monte-Carlo (MC-) simulations as well. A similar project in collaboration with the ETH Zurich is dedicated to the investigation of the radiation exposure during fluoroscopy of hip-implants using a XRF-robot.
Physiological parameter assessment using MRI-based techniques: Our group is experienced in developing dedicated phantoms for calibration and QA of physiological measurements. This knowledge can be combined with the experience in modelling physiological processes and model-based data analysis.
Nuclear medicine: We focus especially on pharmacokinetic- and pharmacodynamic modelling in combination with imaging data.
Risk assessment and radiation protection: We combine radiation measurements with MC- simulations and dedicated dynamic models to assess radiation risks from different sources such as X-ray units, linear accelerators or radioactive isotopes.
Özden I, Scheidegger S (2014): The influence of scan length and collimation on the CTDIvol measurement in case of helical CT. Proc. of Joint Conference of SSRMP, DGMP and ÖGMP 2014 (ISBN 987-3-9816508-5-3), 459-460
Scheidegger S, Marder D, Timm O, Bonmarin M, Rhodes S (2014): Measuring skin perfusion after superficial hyperthermia using IR-cam technology. SSBE Annual Meeting 2014, 20
Haller K, Markert B, Lutters G, Scheidegger S (2013): Dosimetric comparison of the elliptical ZHAW-CTDI-phantom with the standard CTDI phantom. SSRMP annual scientific meeting 2012, P07, 58
Haller K, Scheidegger S, Lutters G (2012): Linac radiation shielding under clinical conditions – radiation protection case report. Proc. of SSRMP annual scientific meeting 2012, 56
Boye D, Müller B, Tobler S, Wassmer F, Buck M, O’Brian K, Remonda L (2013): Quality assurance phantom for MRI-based flow measurements. SSRMP annual scientific meeting 2012, O25, 40
Vieira LDA, Markert B, Scheidegger S (2013): CTDI measurements for clinical protocols and comparison to CTDI indications of CTs. Swiss Congress of Radiology 2013, 57
Scheidegger S, Haller K, Markert B, Güdel H, Vieira LDA, Lutters G (2013): Potential of optimisation of CR- and DR-units. Swiss Congress of Radiology 2013, 57
Haller K, Markert B, De Abreu Viera L, Lutters G, Scheidegger S (2012): Evaluation of the RADPAD radiation protection shielding using an Alderson phantom in a clinical situation (cardiology). Proc. of SSRMP annual scientific meeting 2012, 57
Fässler C., Lanzolla I., Egli P., Scheidegger S.(2011): CR-based method for measuring the dose distribution in an anthropomorphic phantom. Proc. of Dreiländertagung ÖGMP, DGMP & SGSMP Wien, 96
Meola A., Lerch C., Egli P., Lutters G., Scheidegger S. (2011): Quality assurance of surface hyperthermia using a TLC-based measurement system. Proc. of SSBE annual meeting 2011, 38
Scheidegger, S. (2009): Comparison of image quality between a digital panorama X-ray unit with a CdTe-CMOS detector and panorama X-ray units with other types of digital detectors. Proc. of SSRMP Annual Scientific Meeting 2009, 63-69.
Spaeth, N., Wyss, M. T., Weber, B.,
Scheidegger, S., Lutz, A., Verwey, J., Radovanovic, I., Pahnke, J.,
Wild, D., Westera,
G., Weishaupt, D., Hermann, D. M., K