By E.E Payne
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Extra resources for An Atlas of Pathology of the Brain
Sample text
During the examination shown in the figure on the left, the wall filter was not switched on so the whole flow curve was displayed including the slow, end- diastolic velocities. 7. From the curve on the right, it can be seen that the wall filter has been set to a very high level since there are no frequency points on the screen between this value and the zero line. However, this means that the end-diastolic flow rates have been discriminated against and therefore do not appear on the screen. When calculating the RI automatically or manually, it is assumed that the corresponding flow rate was almost 0, so the perfusion resistance of the circulation supply area must have been very high.
25 Swivel of the color window to reach an optimal angle group which are active and assigned to a scanning line at slightly different points in time in each case. 24). The main area of use for this linear array method is in the examination of vessels which run near to and parallel to the surface of the skin. 25). As already explained, when the measurement range of a pulsed Doppler system is limited as soon as the Doppler frequency exceeds half of the pulse repetition frequency (the frequency at which transmitted pulses are beamed into the body), the corresponding frequency points on the Doppler spectrum appear on the neighbouring channel.
Springer, Berlin/Heidelberg/NewYork, pp 20–24 McLeod FD (1974) Multichannel pulse Doppler techniques. In: Renemann RS (ed) Cardiovascular application of ultrasound. American Elsevier Publishing Co, New York, pp 85–107 Mühlen zur J (1989) Dopplersonographie der peripheren Arterien und Venen. Promonta, Hamburg Namekawa K, Kasai C, Tsukamoto M, Koyano A (1982) Real-time bloodflow imaging system utilizing autocorrelation techniques. In: Lerski RA, Morley P (eds) Ultrasound’82. Pergamon, New York, pp 203–208 Omoto R (1984) Principle and equipment.