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Biomedical subjects

K V Jenderka

Publications and source records attributed to K V Jenderka.

9 recordsLinked to original sources
PubMed2006

[Up to date technologies in ultrasound imaging].

The rapid innovation rate of medical ultrasound devices involves continuously new methods in diagnostic sonography. These techniques permit higher resolutions and increased contrast for expressive diagnosis and more reliable results. But the broad spectrum of new techniques and methods also confronts the user with higher requirements in training and application. Knowledge about the mode of operation is helpful for the selection of the right procedure and the proper application of the methods. This article describes a number of new technologies and principles for the design of scan heads, the generation of ultrasound pulses and fast imaging procedures. The ideas behind these techniques are explained along with the connected advantages and drawbacks.

Equipment Design↗
PubMed2002

[Transrectal ultrasound of the prostate. Current status and prospects].

In recent years the role of ultrasound in the diagnosis of prostate carcinoma has increased in importance. In view of the increasing incidence of prostate cancer, which is the most frequent malignant neoplasm in men, TRUS (transrectal ultrasound) is an important imaging method in the diagnosis of various prostate diseases. This paper provides a basic overview of physical and technical bases of TRUS investigation of the prostate. It concerns technical developments and modern techniques designed to improve its value in diagnosis. Impressive innovations in ultrasound equipment, particularly in the area of colour-coded Doppler sonography in association with microbubble-enhanced colour Doppler ultrasound, have given rise to justifiable hope of improvements in the early diagnosis of prostate cancer.

Diagnosis, Differential↗
PubMed2002

[Determination of acoustic parameters from ultrasound raw and HF data--a comparison].

Different methods for determination of acoustical tissue parameters based on rf data acquisition as well as the analysis of B-mode image data are well established. Because of limitations of the dynamic range and the restricted control of the tgc and focus settings the analysis of image data is not achievable in clinical practice. On the other side rf data are not available in most of the clinical scanners. So the analysis of raw data can be used as an compromise. Raw- and rf-data of complete B-mode scans obtained form a set of test phantoms by a clinical ultrasound device (HDI 5000, Philips) in connection with the applied gain settings were analyzed. For different system settings the estimated parameters showed a good agreement with the acoustical properties of the phantoms.

Acoustics↗
PubMed1998

[Equipment-independent ultrasound tissue characterization of testis and prostate].

The result of a B-scan ultrasound examination is strongly dependent on the type of the used B-system, the chosen system parameters and the experience and critical analysis of the clinical investigator. The estimation of quantitative acoustic parameters, independent of the type of the used B-system, is one way to overcome the subjective nature and the problems of the interpretation of B-scan images. A procedure was developed to determine acoustical tissue specific parameters (ultrasound attenuation, relative backscatter coefficient) in terms of the ultrasound spectroscopy and to correct the system effects. A requirement for the calculation of acoustical parameters is the availability of primary rf echo signals without any preprocessing. Up to now measurements of phantom materials and in-vivo investigations on human testis and prostate have been carried out. The effects of pathological changes in the tissue state on the acoustical parameters are demonstrated in some examples.

Artifacts↗
PubMed1990

[Difficulty in determining ultrasonic attenuation values from selective echograms].

The value of tomography is beyond all doubt. Custom systems allow the quantitative assessment of topographic and kinetic parameters of various organs and the blood. The assessment of tissue, however, is still qualitative and experimental methods for quantitative tissue characteristics are still expensive. We propose a method, that allows the determination of attenuation coefficients with little technical expense.

Humans↗