[Intraoperative diagnosis of XXXX ].

@entity5 @entity11 @entity82 @entity13
At the Burdenko Institute for Neurosurgery in Moscow, the following methods are used for the demarkation of @entity13 : Beta-radiometry, rheometry = measurement of th electrical resistance of the cerebral tissue, staining of the @entity5 prior to the surgical intervention by means of a Serbinenko catheter, puncture biopsy as well as thermometry. The most frequently used techniques are beta-radiometry and rheometry. The methods are simple in application and the results are reliable. The accuracy of the localisation of a @entity13 by means of beta-radiometry is 98 per cent. For the impedance measurement a frequency of 1000 Hz is used. Liquids show the lowest and @entity82 the highest electrical resistance values. On an average the resistance of @entity5 is half as high as that of the average normal brain tissue. In almost all operations one tries to obtain an information about the extent and position of the @entity11 by means of brain puncture. A special needle probe has been designed to obtain tissue pieces for histological examinations. Experience has also been gained with ultrasonic probing and with temperature measurements of @entity5 and brain tissue. the interior of the @entity5 shows a 0.5 to 3 degrees C higher temperature.
