Ph.D. Gallery

Dynamic Cardiac Chamber Imaging in C-arm Computed Tomography Cardiovascular diseases, i.e. disorders pertaining to the heart and blood vessels, are a major cause of mortality in developed countries. Many of these disorders, such as stenoses and some cases of valvular dysfunction, can be diagnos...

Accurate Measurements with Off-the-Shelf Range Cameras Abstract Distance cameras have gained large popularity in the last years. With more than 24 million Microsoft Kinect units sold and the proliferation of 3-D sensors for biometric authentication, these cameras have reached the mass market...

Multi-Frame Super-Resolution Reconstruction with Applications to Medical Imaging Abstract The optical resolution of a digital camera is one of its most crucial parameters with broad relevance for consumer electronics, surveillance systems, remote sensing, or medical imaging. However, resolut...

Signal Processing for Interventional X-ray-based Coronary Angiography Abstract Rotational angiography using C-arm scanners enables intra-operative 3-D imaging that has proved beneficial for diagnostic assessment and interventional guidance. Despite previous efforts, rotational angiography wa...

Interactive Analysis of Multispectral and Hyperspectral Image Data Abstract A multispectral or hyperspectral sensor captures images of high spectral resolution by dividing the light spectrum into many narrow bands. With the advent of affordable and flexible sensors, the modality is constantl...

Iterative Reconstruction Methods to Reduce Respiratory Motion Artifacts in Cartesian Coronary MRI Abstract Cardiovascular diseases and coronary artery disease (CAD) in particular are the leading cause of death in most developed countries worldwide. Although CAD progresses slowly over several...

Motion Correction and Signal Enhancement in Optical Coherence Tomography Abstract Optical Coherence Tomography (OCT) is a non-invasive optical imaging modality with micron scale resolution and the ability to generate 2D and 3D images of the human retina. OCT has found widespread use in oph...

Automatic Assessment of Prosody in Second Language Learning Abstract The present thesis studies methods for automatically assessing the prosody of non-native speakers for the purpose of computer-assisted pronunciation training. We study the detection of word accent errors, and the general as...

MR-Based Attenuation Correction for PET/MR Hybrid Imaging Abstract The recent and successful integration of positron emission tomography (PET) and magnetic resonance imaging (MRI) modalities in one device has gained wide attention. This new hybrid imaging modality now makes it possible to im...

Automatic Unstained Cell Detection in Bright Field Microscopy Abstract Bright field microscopy is preferred over other microscopic imaging modalities whenever ease of implementation and minimization of expenditure are main concerns. This simplicity in hardware comes at the cost of image qual...