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Auflistung nach Schlagwort "MRI"

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  • Konferenzbeitrag
    An automated 4D approach for left ventricular assessment in clinical cine MR images
    (INFORMATIK 2006 – Informatik für Menschen, Band 1, 2006) Wesarg, Stefan; Nowak, Stefanie
    Cine Magnetic Resonance (MR) imaging has become the method-of-choice for the examination of the dynamic behaviour of the heart. An assessment of the left ventricle can reveal regions of myocardial dysfunction and their severeness. The scope of this work is a complete analysis of the left ventricular dynamics for the usage in a clinical environment. For that purpose, endocardial and epicardial borders are automatically extracted in 3D cine data in a first step. This is followed by a segmentation of the endocardium and the myocardium into 17 segments following the recommendations of the American Heart Association and the computation of common global volumetric values (stroke volume, ejection fraction etc.) and parameters that describe the left ventricular dynamics (wall motion, wall thickening). A retrospective analysis of cardiac cine MR image data from 20 patients (healthy ones, patients with abnormal wall motion, and patients who suffered an infarction) has been done. That image data has been acquired in the clinical routine at two different hospitals. The here presented automated approach led to a successful segmentation and assessment of the left ventricle for all data sets. The pathological cases could be identified easily due to their characteristic change of the motion pattern. The main advantage of our approach is the reproducibility of the assessment results and the gain in time for the cardiologist who has to analyse the huge amount of cine data.
  • Konferenzbeitrag
    Do You Dare to Ask? Influence of Question Recipient and Information Medium on Prompting Preparatory Questions for MR Imaging
    (Proceedings of Mensch und Computer 2024, 2024) Kamps, Jonas Carl Christian; Birk, Max V.; Vriens, Chantal; Wallner, Günter; Bernhaupt, Regina
    Patient portals empower patients to schedule appointments, ask questions, and provide information for upcoming procedures. While patient portals provide advantages for cooperation between medical institutions and patients, provided information can be unengaging. Interactive alternatives include question prompting, which can elicit helpful questions patients would otherwise not ask; and simulations, which have been used to engage patients when informing them about medical procedures. To investigate barriers of simulations and question prompting to engage patients when informing them about a medical procedure, we developed an MRI (Magnetic Resonance Imaging) virtual walkthrough and compared task load of this procedural simulation with a standard information leaflet. After receiving information either through the virtual walkthrough or leaflet, we asked 105 participants recruited through Amazon Mechanical Turk to ask questions about the procedure either to an expert or to a peer. Comparing virtual walkthrough and leaflet, we find positive effects of the walkthrough on mental load. Investigating the linguistic properties of questions, we find experts received more technical questions; peer questions focused on the procedure’s emotional content. Our results give insight into linguistic differences in questions, contribute practical knowledge to prompt questions, and discuss the potential of virtual walkthroughs and peer questions for preparing medical procedures.
  • Workshopbeitrag
    Exploring the Benefits of Holographic Mixed Reality for Preoperative Planning with 3D Medical Images
    (Mensch und Computer 2019 - Workshopband, 2019) Mast, Marcus; Kaup, Ina; Krüger, Sebastian; Ullrich, Christian; Schneider, Robert; Bay, Susanne
    Today surgeons usually prepare for operations by inspecting sets of 2D radiological images. This means that they need to form a 3D mental model from 2D data. The lack of depth perception afforded by 2D images is an issue especially in complex cases. New and improved approaches are therefore an area of active research. Recent advances in both holographic mixed reality and 3D visualization techniques represent an interesting opportunity to address this issue. The article describes our ongoing efforts to support surgeons in preoperative planning by developing a medical volume viewer for Microsoft’s HoloLens 2 headset. The app combines the state-of-the art image quality of cinematic volume rendering with the excellent depth perception in holographic headsets and will allow new ways of planning surgeries and interacting with medical volumes.