Zobrazeno 1 - 10
of 159
pro vyhledávání: '"Walter J. Lorenz"'
Autor:
Walter J. Lorenz, U. Räth, Ivan Zuna, B. Kommerell, A. Lorenz, B. Limberg, D. Schlaps, G. van Kaick
Publikováno v:
Ultraschall in der Medizin. 5:94-97
Increased echogenicity is one of the major diagnostic criteria for the subjective evaluation of liver echograms. In our approach to ultrasonic tissue characterisation by B-scan image analysis echogenicity is expressed by parameters deriving from the
Publikováno v:
Blood Cells, Molecules, and Diseases. 24:385-395
ABSTRACT: A study on blood cell damage after irradiation of fresh whole blood with 630 nm laser light was carried out in vitro . Various fluence rates of laser light were used with and without cooling of blood. Damage to the blood was assessed by blo
Publikováno v:
IEEE Transactions on Nuclear Science. 45:1737-1742
Single-projection iterative reconstruction allows the use of high overrelaxation parameters. The parameters can be optimized in a pragmatic way by studying their influence on figures of merit extracted from the image. The resulting parameters are hig
Autor:
Peter Peschke, Juergen Debus, Guenther Hartmann, Gunnar Brix, Ulf Hoffmann, Walter J. Lorenz, Christian P. Karger, Eric W. Hahn
Publikováno v:
International Journal of Radiation Oncology*Biology*Physics. 39:1163-1172
Purpose: Only few quantitative data are available on late effects in the healthy brain after radiosurgery. An animal model can contribute to systematically investigate such late effects. Therefore, a model applying radiosurgery at the rat brain was e
Publikováno v:
Nuclear Medicine and Biology. 23:897-906
The effective clinical use of the anticancer drug 5-fluorouracil (5-FU) requires the non-invasive assessment of its transport and metabolism, particularly in the tumor and the liver, where the drug is catabolized to alpha-fluoro-beta-alanine (FBAL).
Autor:
G. van Kaick, Peter E. Huber, Jürgen Jenne, M. Wannenmacher, Jürgen Debus, K. Jochle, Walter J. Lorenz
Publikováno v:
Der Radiologe. 36:64-71
Unser Interesse gilt der Wechselwirkung von hochenergetischen Ultraschallwellen mit biologischen Geweben im Hinblick auf die onkologische Therapie. In dieser Arbeit werden die physikalischen und biologischen Aspekte diskutiert und zusammengefast. Die
Publikováno v:
Zeitschrift für Medizinische Physik. 6:188-193
Zusammenfassung Die Entstehung transienter Kavitationsblasen in biologischen Geweben gilt als das wesentliche nichtthermische Agens der Ultraschall-Gewebe-Wechselwirkung. Ziel dieser Arbeit war die Entwicklung eines online-Kavitations-Detektionssyste
Publikováno v:
Ultrasound in Medicine & Biology. 22:329-338
Transient cavitation seems to be a very important effect regarding the interaction of pulsed high-energy ultrasound with biologic tissues. Using a newly developed laser optical system we are able to determine the life-span of transient cavities (rela
Autor:
Lothar R. Schad, Marco Essig, Edgar Müller, Edzard Wiener, Walter J. Lorenz, Klaus Baudendistel
Publikováno v:
Magnetic Resonance Imaging. 14:477-483
Functional magnetic resonance imaging (fMRI) was performed on a conventional 1.5 T scanner by means of a modified FLASH-technique at temporal resolutions of 80 and 320 ms. The method's stability was assessed by phantom measurements and by investigati
Autor:
Gunnar Brix, Matthias E. Bellemann, Uwe Haberkorn, Ludwig Gerlach, Peter Bachert, Walter J. Lorenz
Publikováno v:
Magnetic Resonance in Medicine. 34:302-307
A chemical-shift selective (CHESS) 19 F MR imaging technique was used to map selectively the antineoplastic drug 5-fluorouracil (5-FU) and its major catabolite α-fluoro-β-alanine (FBAL) in tumor-bearing rats. The pulse sequence employed a CHESS RF