Browsing by Author "Wetterling, Friedrich"
Now showing items 1-19 of 19
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ACCURACY OF A LOW-COST NOVEL COMPUTER-VISION DYNAMIC MOVEMENT ASSESSMENT: POTENTIAL LIMITATIONS AND FUTURE DIRECTIONS
Wetterling, Friedrich (2016)The aim of the study was to perform a preliminary validation of a low cost markerless motion capture system (CAPTURE) against an industry gold standard (Vicon). Measurements of knee valgus and flexion during the performance ... -
Bilateral 23Na MR imaging of the breast and quantification of sodium concentration
Wetterling, Friedrich (2014)A novel setup for 23 Na MRI, which allows bilateral imaging of the breast, is presented. For this purpose a figure- eight receive-only 23 Na surface coil was developed. For our experiments on three samples with NaCl ... -
Bone length calibration can significantly improve the measurement accuracy of knee flexion angle when using a marker-less system to capture the motion of countermovement jump
Meldrum, Dara; Wetterling, Friedrich (2016)Marker-less motion capture systems can provide online recordings of human biomechanics during rapid dynamic exercises such as countermovement jump (CMJ) which could indicate an athlete's risk of injury to the anterior ... -
Development of sodium-MRI for stroke and tumour investigations in rodents
Wetterling, Friedrich (Springer, 2008)The aim of this research was to develop a technique for accurately detecting and quantifying the concentration of sodium in diseased tissue via MRI. Measures of tissue sodium concentration can pro- vide information ... -
How inferior vena cava collapsibility index from a novel implantable sensor correlates with estimated plasma volume and NT-proBNP: a study in patients with chronic heart failure
Wetterling, Friedrich (2023)Background: A new wireless implantable sensor can measure inferior vena cava (IVC) area and collapsibility index and was invented for remote monitoring in heart failure. Study objective: To evaluate the relationship ... -
IN SILICO MODELLING OF FLOW-INDUCED COLLAPSE OF BLOOD VESSELS: A COMPARATIVE STUDY OF VOLUME STATUSES
Wetterling, Friedrich (2024)Here, we present the initial steps towards developing a robust computational framework for simulating IVC vessel collapse using FSI. Our preliminary results, qualitative and quantitative, are in good agreement with previous ... -
Local Multi-Channel RF Surface Coil versus Body RF Coil Transmission for Cardiac Magnetic Resonance at 3 Tesla: Which Configuration Is Winning the Game?
Wetterling, Friedrich (2016)Introduction: The purpose of this study was to demonstrate the feasibility and efficiency of cardiac MR at 3 Tesla using local four-channel RF coil transmission and benchmark it against large volume body RF coil ... -
The localization of focal heart activity via body surface potential measurements: tests in a heterogeneous torso phantom
Wetterling, Friedrich (2009)The non-invasive localization of focal heart activity via body surface potential measurements (BSPM) could greatly benefit the understanding and treatment of arrhythmic heart diseases. However, the in vivo validation of ... -
The Measurement of Spatially-Dependant Tissue Sodium Concentration Increase in a Rodent MCAO Stroke Model
Wetterling, Friedrich (2009)The aim of this study was to accurately quantify changes in the Tissue Sodium Concentration (TSC) in the acute phase of a rodent stroke model with high spatio-temporal resolution (0.38mm3 / 10min) at 7T. The ability to ... -
MONITORING OF VOLUME STATUS USING A NOVEL SENSOR FOR THE ASSESSMENT OF INFERIOR VENA CAVA AREA AND COLLAPSIBILITY IN A PATIENT WITH HFREF RECEIVING ADVANCED HEART FAILURE THERAPIES
Wetterling, Friedrich (2023)Background: A novel sensor designed to measure infe- rior vena cava (IVC) area over time was used in this study (FIRE1). The system consists of the implantable sensor and an external belt, which is worn around the ... -
Quantitative 23Na-MRI: From Pre-Clinical to Clinical Practice
Wetterling, Friedrich (2010)Quantitative 23Na-MRI (qNa-MRI) is a non-invasive technique which allows for measuring subtle changes in the Tissue Sodium Concentration (TSC) after ischaemic stroke. Although, an increase in TSC after stroke has been ... -
Signal-to-noise ratio of a mouse brain (13) C CryoProbe system in comparison with room temperature coils: spectroscopic phantom and in vivo results.
Wetterling, Friedrich (2014)MRI and MRS in small rodents demand very high sensitivity. Cryogenic transmit/receive radiofrequency probes (CryoProbes) designed for (1) H MRI of mouse brain provide an attractive option for increasing the performance of ... -
Sodium-23 magnetic resonance imaging during and after transient cerebral ischemia: multinuclear stroke protocols for double-tuned (23)Na/(1)H resonator systems
Wetterling, Friedrich (2012)A double-tuned 23Na/1H resonator system was developed to record multinuclear MR image data during and after transient cerebral ischemia. 1H-diffusion-, 1H perfusion, 1H T2-, 1H arterial blood flow- and 23Na spin density-weighted ... -
Sodium-23 magnetic resonance imaging has potential for improving penumbra detection but not for estimating stroke onset time
Wetterling, Friedrich (2015)Tissue sodium concentration increases in irreversibly damaged (core) tissue following ischemic stroke and can potentially help to differentiate the core from the adjacent hypoperfused but viable penumbra. To test this, ... -
Whole-Body Magnetic Resonance Imaging Enables Assessing Spatial Accuracy and Precision of Skeletal Joint Locations Inferred from Motion Capture Systems
Wetterling, Friedrich (2015)Motion capture systems can be used to infer skeletal joints from three-dimensional surface information for various human poses. However, to-date it remains unclear how well the estimated joint coordinates coincide with ... -
Whole-body sodium-mri at 3 T using an asymmetric birdcage resonator and short echo time sequence: first images of a male volunteer
Wetterling, Friedrich (2012)Sodium magnetic resonance imaging (²³Na MRI) is a non-invasive technique which allows spatial resolution of the tissue sodium concentration (TSC) in the human body. TSC measurements could potentially serve to monitor early ... -
Wireless resonant circuit and variable inductance vascular monitoring implants and anchoring structures therefore
Wetterling, Friedrich (USPTOUSPTO, 2023) -
Wireless vascular monitoring implants
Wetterling, Friedrich (USPTOUSPTO, 2020)