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Biomedical subjects

M Weisser

Publications and source records attributed to M Weisser.

7 recordsLinked to original sources
PubMed1987

[Computer-assisted system for interstitial hyperthermia].

The combination of interstitial radiotherapy and interstitial hyperthermia is more promising in the treatment of tumors than one of these methods alone. The unit developed by us uses the afterloading needles for heating up the tumor tissue with ohm current and for controlling the distribution of temperature in the target volume. Up to twelve needles are provided by one commutator with the R.F. current controlled by the computer. The temperature is measured by three thermistors per needle which are arranged at an axial distance of 2 cm each. The linearization of the thermistor characteristics and the control of cummutator and R.F. generator is performed by the computer over an interface constructed by us. In order to achieve a homogeneous distribution of temperature in the target volume and to avoid hot spots, we have examined several needle configurations by measuring in an homogeneous phantom.

Analog-Digital Conversion↗
PubMed1987

[Combination of interstitial hyperthermia and afterloading therapy at a high-dosage rate].

The study was supposed to develop a method allowing to combine interstitial hyperthermia with high dose rate afterloading therapy. For hyperthermia, metallic hollow needles, which are also used in brachytherapy, are connected with the RF source by a computer-controlled relay switch. The temperature is measured by thermistors incorporated into the needles. Several heating methods are investigated in a homogenous phantom and compared by means of the experimentally determined temperature/time evolutions and isotherms (in a stationary state).

Brachytherapy↗
PubMed1977

[Congenital cerebral arterio-venous fistula with congestive heart failure in the newborn (author's transl)].

Two newborns with cogestive heart failure due to a congenital arterio-venous fistula involving the great vein of Galen are described. The main diagnostic criteria of this anomaly are a hyperactive heart, bounding carotid artery pulses, and a continuous murmur over the skull. The anomaly was visualized by cerebral angiography. In view of the frequent complications such as the development of hydrocephalus, operative treatment seems indicated.

Carotid Arteries↗