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This paper presents the results of a formal experiment that compared three bimanual travel techniques for desktop virtual walkthroughs, each having a different number of degrees of freedom (DOF) for the control interface. When compared in a primed search task, results indicate that the use of a 4-DOF interface with integrated pitch control provides a more realistic travel experience by allowing full...
This paper presents the results of a formal experiment that evaluated three viewpoint orientation techniques for desktop virtual walkthroughs. The results suggest that the use of either velocity or position control techniques for viewpoint orientation does not have a large effect on both travel time and distance for virtual walkthroughs. These results are useful for designers of desktop interactive...
Severe disorders of the heart rhythm that can cause syncope or sudden cardiac death (SCD), can be treated by radio-frequency (RF) catheter ablation. The precise localization of the arrhythmogenic site and the positioning of the RF catheter over that site are problematic: they can impair the efficiency of the procedure and are time consuming (several hours). Our approach consists of integrating fluoroscopic...
The performance of a simple algorithm for the detection of local activation times on cardiac electrograms was evaluated. Unipolar epicardial and endocardial electrograms were recorded in 21 patients undergoing arrhythmia surgery. Local activation times were manually edited and used as standard references. The quasioptimal performance showed a sensitivity and a positive prediction accuracy of 89%.<<ETX>>
A cardiac mapping system is essentially a measurement system designed to record biopotentials from multiple sites over the heart and/or the body surface and to process this data to provide a spatially resolved view of the ongoing cardiac activity. The authors examine how the specifications for diverse applications, such as body surface potential mapping and intraoperative activation mapping, can be...
Spectral analysis using a Fourier transform was performed on extracellular waveforms recorded in canine crista terminalis. For longitudinal propagation, the power spectrum showed a smooth decline and the bandwidth ranged between 1000 and 2400 Hz. For transverse propagation, the spectrum showed multiple lobes and the bandwidth ranged between 1000 and 3600 Hz. The effects of distance between electrode...
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