A5074981980- Advanced X-ray and CT Imaging
- Radiation Dose and Imaging
- Meteorological Phenomena and Simulations
- Plant Water Relations and Carbon Dynamics
- Wind and Air Flow Studies
- Cardiac Imaging and Diagnostics
- Medical Imaging Techniques and Applications
- Atmospheric and Environmental Gas Dynamics
- Fluid Dynamics and Turbulent Flows
- Aeolian processes and effects
- Climate variability and models
- Cryospheric studies and observations
- Tree-ring climate responses
- Atmospheric aerosols and clouds
- Advanced Fiber Optic Sensors
- Air Quality and Health Impacts
- Cerebrovascular and Carotid Artery Diseases
- Advanced MRI Techniques and Applications
- Forest ecology and management
- Air Quality Monitoring and Forecasting
- Geology and Paleoclimatology Research
- Aerodynamics and Fluid Dynamics Research
- Hydrology and Watershed Management Studies
- Urban Heat Island Mitigation
- Radiology practices and education
University of Bayreuth
2016-2025
Hôpital Nord
2024
Centre Hospitalier Régional et Universitaire de Nancy
2024
Oregon State University
2010-2023
Heinrich Heine University Düsseldorf
2015-2022
Institute for Innovative Process Engineering
2022
Helios Klinikum Krefeld
2021
Düsseldorf University Hospital
2015-2020
University of Tübingen
1993-2017
John Wiley & Sons (United States)
2016
Following the trend of low-radiation dose computed tomographic (CT) imaging, concerns regarding detectability low-contrast lesions have been growing. The goal this research was to evaluate whether a new image-based algorithm (Mono+) for virtual monoenergetic imaging with dual-energy CT scanner can improve contrast-to-noise ratio (CNR) and conspicuity these objects when using iodinated contrast media.Four circular phantoms different diameter (10-40 cm) an iodine insert at center were scanned...
An important subject in fuzzy control theory is tuning of a controller. If one wants to tune controller, can focus on the choice rules, membership functions, number input and output sets their degree overlapping,
We analyzed 7 years (2002–2008) of micrometeorological and concurrent biological observations carbon water fluxes at a mature ponderosa pine forest in central Oregon semiarid climate. sought to evaluate the extent that gross primary productivity, net ecosystem exchange, respiration, tree transpiration, evapotranspiration varied seasonally interannually this subjected varying periods severity droughts. To explain variation, we found it necessary define seasons functionally within...
This paper describes the setup for a gamified classroom subject of Software Engineering. A series papers have resulted from this work: "Understanding Student Motivation" at CSEDU 2013 [1] and "Bridging Motivation Gap", an IGIP SPEED Young Scientist award here ICL [2]. The intention behind gamifying course was to increase student engagement motivation by allowing independent learning with flexible speed choice emphasis. Daniel Pink's [3] motivational theory, which is also found in...
OBJECTIVE. Dual-energy CT (DECT) enables subtraction of calcium, facilitating the visualization bone marrow (BM) in axial skeleton. The purpose this study was to assess whether DECT BM images have potential improve detection multifocal and diffuse infiltration multiple myeloma (MM) comparison with regular MRI as reference standard. SUBJECTS AND METHODS. This included 32 consecutive patients who had known MM or presented monoclonal gammopathy unknown significance underwent degrees (none, n =...
To compare and combine dual-energy based iterative metal artefact reduction on hip prosthesis dental implants in CT.A total of 46 patients (women:50%,mean age:63±15years) with or prostheses (n = 30/20) were included examined a second-generation Dual Source Scanner. 120kV equivalent mixed-images derived from reconstructions the 100/Sn140kV source images using no (NOMAR) (IMAR). We then generated monoenergetic extrapolations at 130keV without IMAR (DEMAR) IMAR, (IMAR+DEMAR). The degree was...
Abstract We present a novel technique to simultaneously measure wind speed ( U ) at thousands of locations continuously in time based on measurement velocity‐dependent heat transfer from heated surface. Measuring temperature differences between paired passive and actively fiber‐optic (AHFO) cables with distributed sensing system allowed estimation over 2000 sections along the 230 m transect (resolution 0.375 5.5 s). The underlying concept is similar that hot wire anemometer extended space....
Turbulence measurements for very stable conditions near the surface are contrasted among three sites: a high altitude basin during winter with grass or snow-covered grass, broad valley complex agricultural land use, and more narrow that is influenced by cold pool air drainage. In contrast to previous studies, this investigation emphasizes weak turbulence large bulk Richardson number occurring extensive periods between brief mixing events. The relationship of non-stationary wind...
To retrospectively determine which features of urinary calculi are associated with their detection after virtual elimination contrast medium at dual-energy computed tomographic (CT) urography by using a novel tin filter.The institutional ethics committee approved this retrospective study, waiver informed consent. A total 152 patients were examined single-energy nonenhanced CT and in the excretory phase (either 140 80 kV [n=44] or 100 [n=108], filtration kV). The renal pelvis ureters was...
Objectives The objective of this study was to retrospectively determine the potential virtual monoenergetic (ME) reconstructions for a reduction metal artifacts using new-generation single-source computed tomographic (CT) scanner. Materials and Methods ethics committee our institution approved retrospective with waiver need informed consent. A total 50 consecutive patients (29 men 21 women; mean [SD] age, 51.3 [16.7] years) implants after osteosynthetic fracture treatment who had been...
Abstract In the morning, nocturnal stable boundary layer, SBL, transitions into its daytime convective counterpart substantially impacting distribution of temperature, humidity, and pollutants. Applying distributed temperature sensing (DTS) below a tethered balloon (2–200 m) along tower (0–11 m), for first time we observed three morning (MTs) in mountain layer with high temporal (<10 s) spatial (<0.25 resolutions. We show that MTs are best derived from change static stability...
The partitioning of evapotranspiration (ET) into surface evaporation (E) and stomatal-based transpiration (T) is essential for analyzing the water cycle earth energy budget. Similarly, net ecosystem exchange (NEE) carbon dioxide respiration (R) photosynthesis (P) needed to quantify controls on its sources sinks. Promising approaches obtain these components from field measurements include models based analysis conventional high frequency eddy-covariance data. Here, two such existing...
Purpose: To evaluate dose reduction and image deterioration using in-plane bismuth breast-shielding thyroid-shielding for MDCT. Material Methods: Skin organ doses of thyroid breast were measured with thermoluminescent dosimeters in a female Alderson-Rando Phantom without 4-ply shield. Routine neck (120 kVp, 150 mAs eff ; 16×1.5 mm) chest 100 scan protocols simulated on 16-row MDCT scanner three different settings: shielding, the shield directly surface, 1-cm-thick cotton spacer between...
The purpose of this study was to test the hypothesis that freehand real-time MRI-guided lumbar spinal injection procedures are feasible, accurate, and safe when performed with a clinical open-bore 1.5-T MRI system.A retrospective analysis made over an 18-month period. Forty-nine were on 37 patients (23 women, 14 men; mean age, 36 years; range, 18-48 years). A rapid FLASH 2D sequence (TR/TE, 9.3/3.5; slice thickness, 5 mm; acquisition time, 1 second) used for needle placement technique. Data...
To retrospectively evaluate radiation dose, image quality, and the ability to differentiate urinary calculi of differing compositions by using low-dose dual-energy computed tomography (CT).The institutional review board approved this retrospective study; informed consent was waived. A CT protocol (tube voltage reference effective tube current-time product, 140 kV 23 mAs 80 105 mAs; collimation, 64 × 0.6 mm; pitch, 0.7) for detection implemented into routine clinical care. All patients (n =...
<b>Purpose:</b> To evaluate a novel monoenergetic post-processing algorithm (MEI+) in patients with poor intrahepatic contrast enhancement. <b>Materials and Methods:</b> 25 were retrospectively included this study. Late-phase imaging of the upper abdomen, which was acquired dual-energy mode (100/140 kV), used as model for Traditional images (MEI), linearly weighted mixed different mixing ratios (MI), sole 100 140 kV MEI+ calculated. is technique applies frequency-based low keV an image...