Jason Schuster

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Systematic investigations have been undertaken in order to evaluate the potential of low resolution NMR for characterization of biological tissue (in vitro) during early post mortem period. Test measurements from corn-oil samples are compared with computer simulated data. Furthermore, time-after-excision dependence of mouse-liver tissue is presented using(More)
Despite numerous work on spin-lattice (T1) relaxation in vitro, not much attention has been paid on spin-spin (T2) relaxation until now. In this study we are presenting spin-spin relaxation time measurements of mouse liver tissue in order to estimate the time-after-excision effects. The post mortem behaviour of excised tissue was investigated up to four(More)
The radial forearm free flap is widely used in microsurgical reconstruction where a thin, hairless flap is required. While the radial artery may be based either proximally or distally, the venous drainage is generally proximally based in order to provide normal flow through the valves. We have utilised this flap in two patients, based distally on both the(More)
Pressure controlled intermittent coronary sinus occlusion (PISCO) was applied in 30 patients undergoing coronary artery bypass surgery. The occlusion and release times were manually adjusted according to visual control of the intraoperatively monitored coronary sinus pressure. In six patients the coronary sinus measurements were additionally digitised with(More)
Analog/Digital conversion of up to 16 channels can be set up and executed interactively with sampling rates individually adjusted for each channel. Additionally, asynchron and parallel digital I/0 is provided, including the possibility of triggering the beginning and the end of data acquisition on an external TTL signal. For non-experienced personnel the(More)
High sensitivity deep ultraviolet (DUV) photodetectors operating at wavelengths shorter than 280 nm are useful for various applications, including chemical and biological identification, optical wireless communications, and UV sensing systems (1). While semiconductor avalanche photodiodes (APDs) can be more compact, lower cost and more rugged than the(More)
Coronary sinus pressure data have been obtained from anaesthetized dogs during pressure controlled intermittent coronary sinus occlusion. It is the main aim of this paper to provide a mathematical procedure for modelling the typical time course of sinus pressure after temporary obstruction of the sinus. The model is produced by fitting a parameterized(More)
We have evaluated two mathematical models to describe the increase in coronary sinus pressure (CSP) following pressure controlled intermittent coronary sinus occlusion (PICSO). The models are evaluated and compared on the basis of human and canine data. Both models were fitted by non-linear least squares algorithms. Next, derived quantities, such as(More)
The haemodynamic responses to pressure controlled intermittent coronary sinus occlusion (PICSO) were recorded intraoperatively in dogs. After analogue-digital conversion the data for coronary sinus pressure were submitted to numerical analysis for detection of systolic and diastolic envelopes and their subsequent fitting by a non-linear model. From the(More)
In spite of numerous work on in vitro proton relaxation time investigations of biological tissue, many questions still remain open. In this study we focused on spin-lattice (T1) relaxation time measurements of mouse liver tissue in order to estimate the time-after-excision effects. The post mortem behaviour of excised tissue was measured up to four hours in(More)