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Abstract

These studies were carried out using an EME TC 2–64 (Fig. 2) manufactured by Eden Medizinische Elektronik GmbH, Ueberlingen, Federal Republic of Germany (on loan from the German Research Association—DFG) which has the following technical features [109]:
  • emitting frequency 2 MHz, pulsed

  • pulse repetition frequency 5–10 KHz

  • pulse duration 13 microseconds

  • axial gate width 13 microseconds

  • acoustic intensity 100 mW/cm2 (max. spatial peak-temporal average) adjustable in steps 10–100%

  • sound transmitting area of Doppler probe 1.5 cm2, focussing of the sound beam with a polystyrene lens at a distance of 5cm as measured in a water bath, where the axial resolution is 5 mm, lateral resolution 8 mm

  • size of the sample volume: approx. 4 × 9 mm at a depth of 5 cm

  • measuring depth 25–155 mm, variable in 5 mm steps

  • low pass filter 10 KHz, high pass filter 150 Hz, so that velocities under 6 cm/sec are not measurable

  • maximum measurable velocity in bidirectional recording ± 200 cm/ sec, in unidirectional measurement 400 cm/sec

  • signal processing by means of frequency spectral analysis (Fast Fourier Transformation) with a frequency resolution of 64 points and a temporal resolution of 13 milliseconds.

  • Scales: bidirectional 0–50, 0–100, 0–150, 0–200 cm/sec; unidirectional 0–100, 0–200, 0–300, 0–400 cm/sec.

Keywords

Internal Carotid Artery Middle Cerebral Artery Basilar Artery Anterior Cerebral Artery Posterior Cerebral Artery 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Wien 1988

Authors and Affiliations

  • Harald Bode
    • 1
  1. 1.KinderspitalBaselSwitzerland

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