Vidar Sørhus

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Vessel diameter is related to the distending blood pressure, and is used in estimations of vessel stiffness parameters. The vessel walls can be tracked by integrating wall velocities estimated by ultrasound (US) Doppler techniques. The purpose of this work was to evaluate the performance of the modified autocorrelation estimator when applied on vessel wall(More)
BACKGROUND This study aimed to investigate the effect of a virtual reality simulator on the learning of basic robotic suturing skills. METHODS Two randomized groups of students underwent a controlled training program. Both groups completed an identical test before and after training. The increase in the number of stitches placed during the pretest and(More)
Based on new advancements in digital technology, we developed a PC- and DSP-based measurement and control system for isolated papillary muscle experiments. High flexibility was obtained through a three level control. Length or force was controlled real-time with a sample frequency of 5000 Hz. Muscle length and up to three segment lengths were measured(More)
BACKGROUND Currently there is no simple clinical method for quantifying the left ventricular (LV) diastolic pressure-volume relation. Echocardiographic-automated endocardial border detection, however, may be combined with LV micromanometer to construct LV pressure-volume loops. We investigated the feasibility of on-line display and sampling of LV(More)
Robotic systems for cardiac surgery have been introduced in clinical trials to facilitate minimally invasive techniques. Widespread use of surgical robotics necessitates new training methods to improve skills and continue practicing as the robotic systems are frequently being upgraded. Today, robotic training is performed on expensive animal models. An(More)
BACKGROUND The introduction of simulators in surgical training entails the need to develop pedagogic platforms adapted to the potentials and limitations provided by the information technology. As a solution to the technical challenges in treating all possible interaction events and to obtain a suitable pedagogic approach, we have developed a pedagogic(More)
In the intact heart, there are simultaneous changes in stress and length throughout the cardiac cycle. In a recently developed digital control system for experiments on isolated papillary muscles from rabbit right ventricle, we included a controlled auxotonic twitch. This twitch allowed proportional changes in stress and length, as if the muscle was acting(More)
A new platform for laparoscopic training and education is presented. Fundamental requirements about a flexible haptic interface, specter of training areas, skill assessment, educational content, and level of realism are presented and discussed. The new system, including a new and flexible haptic interface and a broad specter of training modules combined(More)
Mathematical models have been used to represent the cardiac muscle function or some of its underlying mechanisms. The models range from simple force-velocity relations to complex models of calcium handling and cross-bridge kinetics. Typically, a model is developed to validate hypotheses that have evolved from some experimental findings. However,(More)