Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Harmonic Imaging"”.
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Sonographische Diagnostik der Appendizitis - Vergleich der fundamentalen Bildgebung und Harmonic Imaging bei histologisch gesicherter Appendizitis
Einleitung: Harmonic Imaging ist eine neue Ultraschallmodalität mit hoher Orts- und Kontrastauflösung. Mehrere Vergleichsstudien bei Erwachsenen haben gezeigt, dass Harmonic Imaging der konventionellen (=fundamentalen) Ultraschallbildgebung bei verschiedenen Fragestellungen überlegen ist. Ziel …
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Vergleich von Miktionscystourethrographie und niedrig dosierter, kontrastverstärkter Miktionsurosonographie mittels Harmonic Imaging zur Diagnostik des vesicoureteralen Refluxes bei Kindern
Zielsetzung: Harmonic Imaging produziert Bilder mit hoher Orts- und Kontrastauflösung. Die Mikrobläschen im verwendeten Kontrastmittel werden deutlich sichtbarer. Ziel dieser Studie war es, das diagnostische Potential der kontrastverstärkten Miktionsurosonographie (MUS) mittels Harmonic Imaging bei …
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Applying synthetic aperture, coded excitation, and tissue harmonic imaging techniques to allow ultrasound imaging with a virtual source
… length places a great restriction on ultrasound imaging, especially with a single-element transducer. To extend the region of focus, three techniques were examined. The first was the synthetic aperture focusing technique (SAFT), a well-studied method that allows focus at every distance instead of …
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Tissue spectroscopic characterization based on fluorescence, second harmonic generation, and reflected light
… and function: two-photon spectral resolved imaging, tri-modal imaging, and interferometric second harmonic imaging. First, two-photon spectral resolved microscopy utilizes the 3D localization ability of two-photon excitation to extract spectroscopic information from a femtoliter volume in …
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Characterization of Mechanical Properties at the Micro/Nano Scale: Stiction Failure of MEMS, High-Frequency Michelson Interferometry and Carbon NanoFibers
… Michelson Interferometer is discussed for imaging of crack propagation of the μcantilevers with their substrate at the nano-scale and harmonic imaging of MEMS/NEMS. Van der Waals forces are also responsible for the adhesion in nonwoven carbon nanofiber networks. Experimental and modeling …
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Low-temperature magnetic force microscopy with a simple design: analyzing the magnetic domains of a simple hard disk drive
… properties of different materials, such as imaging high T [subscript c] superconductors. Soon after, the SPM grew and expanded in terms of techniques and properties that could be imaged. For example, some variations of the SPM family have developed into powerful techniques to characterize …
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Enhancing Nonlinear Ultrasonic Methods for Laboratory and Clinical Applications
… ultrasound from the heart obtained by using harmonic imaging, which utilizes nonlinear phenomena to improve the overall quality of clinical ultrasonic images. Several investigators have previously reported a systematic cyclic variation in the backscattered ultrasonic signal from the tissue of …
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A Column-Row-Parallel ASIC architecture for 3D wearable / portable medical ultrasonic imaging
… rate (62.5 volume/s), high quality 3D ultrasonic imaging. An interleaved checker board pattern with I&Q excitations is also proposed for ultrasonic harmonic imaging, reducing transmitted second harmonic distortion by over 20dB, applicable to nonlinear transducers and circuits with arbitrary pulse …
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The role of contemporary echocardiography in the management of heart failure
… in HF patients is optimised by the use of harmonic imaging and not enhanced with the use of transpulmonary contrast agents, whilst diastolic filling is optimised by the use of preload manipulation. When optimised in this way, echocardiography can be used to stratify HF patients in terms of …
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Dynamische kontrastmittelunterstützte Ultraschalluntersuchung fokaler Leberraumforderungen
… in 39 Patienten wurden mittels „Contrast Harmonic Imaging“ (CHI) über einen Zeitraum von 2 min nach einer Bolusinjektion von 10 ml Levovist® (300mg/ml, Schering AG, Berlin) untersucht. Die Untersuchungen wurden an einem Sonoline Elegra® (Siemens AG, Erlangen) mit einem frequenzvariablen …
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Ultrasound and photoacoustic methods for anatomic and functional imaging in image guided radiation therapy
… and optimal protocols that provide contrast when imaging with US and the transducer properties contributing to resolution limits. The US field of view (FOV) was characterized to determine the optimal settings with regard to imaging depth, focal region, with and without harmonic imaging, and …