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C-arm navigation is a new tool in computer assisted surgery. The aim of this study is to evaluate the accuracy of Iso-C-arm based drill holes in the proximal femur. In nine artificial proximal femura, two holes with an angle of 135 degrees and 100 degrees in relation to the shaft axis were drilled in the direction of the femoral head. The defined target of(More)
BACKGROUND The most typical symptoms of patients with nasal septal perforation (SP) are crusting and recurrent nosebleed. The objective of the study was to determine the influence of SP on intranasal temperature profile and airflow patterns during inspiration by means of numerical simulation. METHODS Two realistic bilateral models of the human nose with(More)
Die Navigation basierend auf einem Bildwandler ist eine neue Anwendung in der computerassistierten Chirurgie. Im Rahmen der vorliegenden Studie wurde die Präzision von Iso-C-Arm-basierten Bohrungen am proximalen Femur untersucht. An 9 Kunststoffknochen wurden je 2 Bohrungen mit 135° und 100° Anstiegswinkel zur Schaftachse in Richtung Femurkopf gesetzt. Als(More)
PURPOSE Simulation, description and analysis of dynamic pressure in infrarenal abdominal aortic aneurysms (AAA) before and after endovascular repair. MATERIALS AND METHODS During March 1996 and May 2001, 13 patients with AAA underwent endovascular treatment. The MDR-CT scans of these patients were used for the non-invasive analysis of the hemodynamics in(More)
Recovery of heat and water during expiration is an important but not yet fully understood function of the nose. The presented study investigated cooling of the expiratory air for heat recovery within the human nose applying numerical simulation. A numerical simulation in a bilateral three-dimensional model of the human nose based on computed tomography was(More)
PURPOSE Radical sinus surgery disturbs intranasal humidification and heating of inspired air, resulting in reduced air conditioning mainly caused by a disturbed airflow. Therefore, the aim of this study was to simulate the intranasal airflow after radical sinus surgery during inspiration by means of numerical simulation. MATERIAL AND METHODS A bilateral(More)
BACKGROUND Radical surgical resection of the turbinates leads to a reduced intranasal air conditioning. The aim of this study was to determine the effect of turbinate resection on intranasal heating and airflow patterns using a numerical simulation. METHODS A bilateral model of the human nose with resection of the turbinates on one side based on a CT-scan(More)
OBJECTIVES/HYPOTHESIS In vivo measurements of the intranasal air temperature are feasible. The present study was designed to reproduce temperature distributions within the human nasal cavity by means of numerical simulation. STUDY DESIGN Numerical simulation. METHODS Based on computed tomography (CT), a steady-state computational fluid dynamics (CFD)(More)
BACKGROUND Adequate nasal air-conditioning is of greatest importance. Because detailed processes of nasal air-conditioning still are not completely understood, numerical simulations of intranasal temperature distribution and airflow patterns during inspiration and expiration were performed. METHODS A three-dimensional model of the human nose based on(More)