Am Donnerstag, dem 28.04.2016 findet in Gebäude 29, Raum K058 ab 14.00 Uhr das STIMULATE-Kolloquium statt.
Vortragender:
Dr. Matthias F. Carlsohn
Thema:
"3D-visualization of blood flow in cerebral aneurysms by light field particle image velocimetry"
Abstract:
Morphologically complex aneurysms require endovascular treatment to eliminate potentially lethal hemorrhagic rupture by hemostasis of blood flow within the aneurysm. Prior careful planning of treatment is necessary and individualized in each patient. Important information of how devices for aneurysm closure (e.g. coils and flow diverters) promote homeostasis on a microscopic level has not been possible so far. This would allow better individualized treatment planning and improve manufacture design of devices. Real-time visualization of dynamic flow processes in micro-structures is a hot-spot of research and may address the need for microscopic cerebrovascular flow visualization. Three dimensional replicas of aneurysms would be required for flow measurements; however, up to now the size of structures has set the limits for conventional 3D-imaging camera set-ups. Real-time demands require additional computational power to cope with the processing load caused by the size of data amount generated by sequences of multi-view stereo data, e.g. generated by a light field camera capturing the 3D information by plenotptic imaging of complex flow processes. Recently, neuro-radiologists reproduced patient specific three dimensional models of cerebral arteries that contain aneurysms by a photo-lithographic (SLA) process of a 3D printer. These models are transparent an exhibit a replication precision within a submillimeter range required for accurate flow measurements under physiological conditions. We tested if microscopic flow measurements may be accomplished by particle image velocimetry (PIV) using a plenoptic camera system by applying light field image sequences. Our approach enables 3D-insight into the micro-structures of blood vessels down to few millimeters diameters that may contain the aneurysm. Averaging across a sequence of single double or triple shots of flashed images enables reconstruction of the real-time flow of the blood passing through the vessel system with and without implants to study the flow dynamics and its impact to the blood vessel and the blood flow. Beside the description of the imaging set-up, the PIV analysis and the medical conclusions retrieved from the experiments, this paper discusses the computational load and how to approach the real-time simulation of the flow dynamics by high-speed light field image analysis in order to approach real-time simulations by real-time analysis of the 3D particle flow.
CV:
Dr. Carlsohn has a track record in scientific and commercial image processing and communication with 35 years of experiences in this field gathered during his studies of electrical engineering and computer sciences from up to several affiliations in large consumer and in defence industry, as co-founder of related start-ups as well as from several universities in Germany and abroad where he was appointed. In his Engineering and Consultancy for Computer Vision and Image Communication he is dealing with related commercial and industrial developments and applications and drives as co-editor-in-chief Springer’s Journal of Real-Time Image Processing and promotes as co-chair of IS&T / SPIE's annual Electronic Imaging and SPIE's bi-annual Photonics Europe conferences on Real-Time Image Processing this fast emerging field.
Alle Interessenten sind herzlich eingeladen.
Eröffnung
