@article{FrauenrathHezelRenzetal.2010, author = {Frauenrath, Tobias and Hezel, Fabian and Renz, Wolfgang and de Geyer d'Orth, Thibaut and Dieringer, Matthias and von Knobelsdorf-Brenkenhoff, Florian and Prothmann, Marcel and Schulz-Menger, Jeanette and Niendorf, Thoralf}, title = {Acoustic cardiac triggering: a practical solution for synchronization and gating of cardiovascular magnetic resonance at 7 Tesla}, series = {Journal of Cardiovascular Magnetic Resonance}, volume = {12}, journal = {Journal of Cardiovascular Magnetic Resonance}, number = {1}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1532-429X}, doi = {10.1186/1532-429X-12-67}, year = {2010}, abstract = {Background To demonstrate the applicability of acoustic cardiac triggering (ACT) for imaging of the heart at ultrahigh magnetic fields (7.0 T) by comparing phonocardiogram, conventional vector electrocardiogram (ECG) and traditional pulse oximetry (POX) triggered 2D CINE acquisitions together with (i) a qualitative image quality analysis, (ii) an assessment of the left ventricular function parameter and (iii) an examination of trigger reliability and trigger detection variance derived from the signal waveforms. Results ECG was susceptible to severe distortions at 7.0 T. POX and ACT provided waveforms free of interferences from electromagnetic fields or from magneto-hydrodynamic effects. Frequent R-wave mis-registration occurred in ECG-triggered acquisitions with a failure rate of up to 30\% resulting in cardiac motion induced artifacts. ACT and POX triggering produced images free of cardiac motion artefacts. ECG showed a severe jitter in the R-wave detection. POX also showed a trigger jitter of approximately Δt = 72 ms which is equivalent to two cardiac phases. ACT showed a jitter of approximately Δt = 5 ms only. ECG waveforms revealed a standard deviation for the cardiac trigger offset larger than that observed for ACT or POX waveforms. Image quality assessment showed that ACT substantially improved image quality as compared to ECG (image quality score at end-diastole: ECG = 1.7 ± 0.5, ACT = 2.4 ± 0.5, p = 0.04) while the comparison between ECG vs. POX gated acquisitions showed no significant differences in image quality (image quality score: ECG = 1.7 ± 0.5, POX = 2.0 ± 0.5, p = 0.34). Conclusions The applicability of acoustic triggering for cardiac CINE imaging at 7.0 T was demonstrated. ACT's trigger reliability and fidelity are superior to that of ECG and POX. ACT promises to be beneficial for cardiovascular magnetic resonance at ultra-high field strengths including 7.0 T.}, language = {en} } @misc{FrauenrathNiendorf2012, author = {Frauenrath, Tobias and Niendorf, Thoralf}, title = {MRT-Vorrichtung und Verfahren zum Betreiben einer MRT-Vorrichtung}, year = {2012}, abstract = {A magnetic resonance tomography (MRT) apparatus (1) for the examination of a body (14) comprises parameter acquisition devices (13) for the acquisition of cardiovascular parameters of the body (14) and a control device (15) in communication with the parameter acquisition devices (13) for synchronizing the imaging, wherein the control device (15) is adapted to analyse the data of at least two parameter acquisition devices (13) and to output a control signal based on the analysis.}, language = {de} } @article{FrauenrathNiendorfKob2008, author = {Frauenrath, Tobias and Niendorf, Thoralf and Kob, Malte}, title = {Acoustic method for synchronization of Magnetic Resonance Imaging (MRI)}, series = {Acta Acustica}, volume = {94}, journal = {Acta Acustica}, number = {1}, publisher = {Hirzel}, address = {Stuttgart}, issn = {1861-9959}, doi = {10.3813/AAA.918017}, pages = {148 -- 155}, year = {2008}, abstract = {Magnetic Resonance Imaging (MRI) of moving organs requires synchronization with physiological motion or flow, which dictate the viable window for data acquisition. To meet this challenge, this study proposes an acoustic gating device (ACG) that employs acquisition and processing of acoustic signals for synchronization while providing MRI compatibility, immunity to interferences with electro-magnetic and acoustic fields and suitability for MRI at high magnetic field strengths. The applicability and robustness of the acoustic gating approach is examined in a pilot study, where it substitutes conventional ECG-gating for cardiovascular MR. The merits and limitations of the ACG approach are discussed. Implications for MR imaging in the presence of physiological motion are considered including synchronization with other structure- or motion borne sounds.}, language = {en} } @misc{FrauenrathPfeifferHezeletal.2012, author = {Frauenrath, Tobias and Pfeiffer, Harald and Hezel, Fabian and Dieringer, Matthias A. and Winter, Lukas and Gr{\"a}ßl, Andreas and Santoro, Davide and {\"O}zerdem, Celal and Renz, Wolfgang and Greiser, Andreas and Niendorf, Thoralf}, title = {Lessons learned from cardiac MRI at 7.0 T: LV function assessment at 3.0 T using local multi-channel transceiver coil arrays}, series = {2012 ISMRM Annual Meeting Proceedings}, journal = {2012 ISMRM Annual Meeting Proceedings}, issn = {1545-4428}, year = {2012}, abstract = {Cardiac MR (CMR) is of proven clinical value but also an area of vigorous ongoing research since image quality is not always exclusively defined by signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). Recent developments of CMR at 7.0 T have been driven by pioneering explorations into novel multichannel transmit and receive coil array technology to tackle the challenges B1+-field inhomogeneities, to offset specific-absorption rate (SAR) constraints and to reduce banding artifacts in SSFP imaging. For this study, recognition of the benefits and performance of local surface Tx/Rx-array structures recently established at 7.0 T inspired migration to 3.0 T, where RF inhomogeneities and SAR limitations encountered in routine clinical CMR, though somewhat reduced versus the 7.0 T situation, remain significant. For all these reasons, this study was designed to build and examine the feasibility of a local four channel Tx/Rx cardiac coil array for anatomical and functional cardiac imaging at 3.0 T. For comparison, a homebuilt 4 channel Rx cardiac coil array exhibiting the same geometry as the Tx/Rx coil and a Rx surface coil array were used.}, language = {en} } @article{FuchsRitz2011, author = {Fuchs, Britta and Ritz, Thomas}, title = {Absatzkan{\"a}le kaum verkn{\"u}pft}, series = {IT-Mittelstand : IT-Business im Mittelstand}, volume = {2011}, journal = {IT-Mittelstand : IT-Business im Mittelstand}, number = {9}, publisher = {Medienhaus-Verlag}, address = {Bergisch-Gladbach}, pages = {16}, year = {2011}, language = {de} } @inproceedings{FuchsRitz2014, author = {Fuchs, Britta and Ritz, Thomas}, title = {Usability for Blended Shopping - Solving Major Flaws by Applying Usability Engineering and Proven Integration Technologies}, series = {Proceedings of the 11th International Conference on e-Business, ICE-B 2014, Vienna, Austria}, booktitle = {Proceedings of the 11th International Conference on e-Business, ICE-B 2014, Vienna, Austria}, isbn = {978-989-758-043-7}, doi = {10.5220/0005113502160223}, pages = {216 -- 223}, year = {2014}, language = {en} } @inproceedings{FuchsRitzStrauch2012, author = {Fuchs, Britta and Ritz, Thomas and Strauch, Jakob}, title = {Usability of mobile applications : dissemination of usability engineering in small and medium enterprises}, series = {Proceedings of the International Conference on Data Communication Networking, e-Business and Optical Communication Systems : Rome, Italy, 24 - 27 July, 2012 ; [integrated in the ICETE (International Conference on e-Business and Telecommunications)]}, booktitle = {Proceedings of the International Conference on Data Communication Networking, e-Business and Optical Communication Systems : Rome, Italy, 24 - 27 July, 2012 ; [integrated in the ICETE (International Conference on e-Business and Telecommunications)]}, editor = {Obaidat, Mohammad S.}, publisher = {SciTePress}, address = {[Lissabon]}, isbn = {978-989-8565-23-5}, pages = {272 -- 277}, year = {2012}, language = {en} } @inproceedings{GaldiHartungDugelay2019, author = {Galdi, Chiara and Hartung, Frank and Dugelay, Jean-Luc}, title = {Socrates: A database of realistic data for source camera recognition on smartphones}, series = {Proceedings of the 8th International Conference on Pattern Recognition Applications and Methods - Volume 1: ICPRAM}, booktitle = {Proceedings of the 8th International Conference on Pattern Recognition Applications and Methods - Volume 1: ICPRAM}, isbn = {978-989-758-351-3}, doi = {10.5220/0007403706480655}, pages = {648 -- 655}, year = {2019}, language = {en} } @inproceedings{GaldiHartungDugelay2017, author = {Galdi, Chiara and Hartung, Frank and Dugelay, Jean-Luc}, title = {Videos versus still images: Asymmetric sensor pattern noise comparison on mobile phones}, series = {Electronic Imaging}, booktitle = {Electronic Imaging}, publisher = {Society for Imaging Science and Technology}, address = {Springfield, Virginia}, issn = {2470-1173}, doi = {10.2352/ISSN.2470-1173.2017.7.MWSF-331}, pages = {100 -- 103}, year = {2017}, abstract = {Nowadays, the most employed devices for recoding videos or capturing images are undoubtedly the smartphones. Our work investigates the application of source camera identification on mobile phones. We present a dataset entirely collected by mobile phones. The dataset contains both still images and videos collected by 67 different smartphones. Part of the images consists in photos of uniform backgrounds, especially collected for the computation of the RSPN. Identifying the source camera given a video is particularly challenging due to the strong video compression. The experiments reported in this paper, show the large variation in performance when testing an highly accurate technique on still images and videos.}, language = {en} } @book{GalleyMinoggioSchubaetal.2016, author = {Galley, Birgit and Minoggio, Ingo and Schuba, Marko and Bischoff, Barbara and H{\"o}fken, Hans-Wilhelm}, title = {Unternehmenseigene Ermittlungen : Recht - Kriminalistik - IT}, publisher = {Erich Schmidt Verlag}, address = {Berlin}, isbn = {978-3-503-16531-5}, pages = {XIII, 372 S.}, year = {2016}, language = {de} } @inproceedings{GebhardtRitzSiekmannetal.2014, author = {Gebhardt, Andreas and Ritz, Thomas and Siekmann, Kirsten and Wallenborn, Ramona}, title = {Additive manufacturing businesses in the process chain of individualized mass products}, series = {DDMC 2014 : Proceedings of the Fraunhofer Direct Digital Manufacturing Conference}, booktitle = {DDMC 2014 : Proceedings of the Fraunhofer Direct Digital Manufacturing Conference}, editor = {Demmer, Axel}, publisher = {Fraunhofer}, address = {Stuttgart}, isbn = {978-3-8396-9128-1 (E-Book)}, year = {2014}, language = {en} } @phdthesis{Gligorevic2004, author = {Gligorevic, Snjezana}, title = {Entzerrung schnell zeitver{\"a}nderlicher Kan{\"a}le. (Fortschritt-Berichte VDI : Reihe 10, Informatik, Kommunikation ; Nr. 747)}, publisher = {VDI-Verl.}, address = {D{\"u}sseldorf}, isbn = {3-18-374710-3}, pages = {VI, 121 S : graph. Darst.}, year = {2004}, language = {de} } @inproceedings{Gligorevic2002, author = {Gligorevic, Snjezana}, title = {Joint channel estimation and equalization for fast time-variant multipath channels}, series = {Proceedings / 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications : PIMRC 2002 : Lisboa, Portugal, September 15 - 18, 2002}, booktitle = {Proceedings / 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications : PIMRC 2002 : Lisboa, Portugal, September 15 - 18, 2002}, organization = {Institute of Electrical and Electronics Engineers}, isbn = {0-7803-7589-0}, pages = {1127 -- 1130}, year = {2002}, language = {en} } @article{Gligorevic2008, author = {Gligorevic, Snjezana}, title = {Joint channel estimation and equalisation of fast time-varying frequency-selective channels}, series = {European transactions on telecommunications}, volume = {Vol. 19}, journal = {European transactions on telecommunications}, number = {Iss. 1}, issn = {1541-8251; 2161-3915; 1120-3862; 1124-318X}, pages = {1 -- 13}, year = {2008}, language = {en} } @article{Gligorevic2013, author = {Gligorevic, Snjezana}, title = {Airport surface propagation channel in the C-Band: measurements and modeling}, series = {IEEE transactions on antennas and propagation}, volume = {Vol. 61}, journal = {IEEE transactions on antennas and propagation}, number = {Iss. 9}, publisher = {IEEE}, address = {New York}, issn = {0018-926x}, pages = {4792 -- 4802}, year = {2013}, language = {en} } @inproceedings{Gligorevic2013, author = {Gligorevic, Snjezana}, title = {Stochastic modeling of non-stationary channels}, series = {7th European Conference on Antennas and Propagation (EuCAP) : 8 - 12 April 2013, Gothenburg, Sweden}, booktitle = {7th European Conference on Antennas and Propagation (EuCAP) : 8 - 12 April 2013, Gothenburg, Sweden}, publisher = {IEEE}, address = {Piscataway, NJ}, organization = {European Association on Antennas and Propagation}, isbn = {978-1-4673-2187-7 ; 978-88-907018-1-8}, pages = {1677 -- 1681}, year = {2013}, language = {en} } @inproceedings{GligorevicBottSorger2004, author = {Gligorevic, Snjezana and Bott, Rainer and Sorger, Ulrich}, title = {Equalization for multi-carrier systems in time-varying channels}, series = {Multi-carrier spread-spectrum for future generation wireless systems : fourth international workshop, Germany, September 17-19, 2003}, booktitle = {Multi-carrier spread-spectrum for future generation wireless systems : fourth international workshop, Germany, September 17-19, 2003}, editor = {Fazel, Khaled}, isbn = {1402018371}, pages = {251 -- 258}, year = {2004}, language = {en} } @inproceedings{GligorevicBrandesCosovicetal.2005, author = {Gligorevic, Snjezana and Brandes, Sinja and Cosovic, I. and Schnell, Michael}, title = {B-VHF, ein 'Overlay'-System f{\"u}r die ATC Kommunikation im VHF Band}, series = {Motto: Luft- und Raumfahrt - Grenzen {\"u}berwinden, Horizonte erweitern : Deutscher Luft- und Raumfahrtkongress 2005, Friedrichshafen, 26. bis 29. September 2005}, booktitle = {Motto: Luft- und Raumfahrt - Grenzen {\"u}berwinden, Horizonte erweitern : Deutscher Luft- und Raumfahrtkongress 2005, Friedrichshafen, 26. bis 29. September 2005}, publisher = {DGLR}, address = {Bonn}, organization = {Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth}, pages = {951 -- 958}, year = {2005}, language = {de} } @incollection{GligorevicEppleSchnell2011, author = {Gligorevic, Snjezana and Epple, Ulrich and Schnell, Michael}, title = {The LDACS1 physical layer design}, series = {Future aeronautical communications}, booktitle = {Future aeronautical communications}, publisher = {Intech}, address = {London}, isbn = {978-953-307-625-6}, pages = {317 -- 332}, year = {2011}, language = {en} } @inproceedings{GligorevicJostWalter2009, author = {Gligorevic, Snjezana and Jost, T. and Walter, M.}, title = {Scatterer based airport surface channel model}, series = {IEEE/AIAA 28th Digital Avionics Systems Conference : DASC '09 ; 23 - 29 [i.e. 25 - 29] Oct. 2009, Orlando, Fla.}, booktitle = {IEEE/AIAA 28th Digital Avionics Systems Conference : DASC '09 ; 23 - 29 [i.e. 25 - 29] Oct. 2009, Orlando, Fla.}, organization = {Institute of Electrical and Electronics Engineers}, isbn = {978-1-4244-4078-8}, pages = {4C2-1 -- 4C2-10}, year = {2009}, language = {en} }