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By R. Kenedi (Eds.)

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For this a sector scan was used. The probe was introduced into the oeso­ phagus (focused 5 MHz probe). Omoto et al. (1965) introduced a probe with a lateral sound outlet surface into the femoral vein and advanced 28 WERNER BÜSCHMANN (a) ft ir-^MrmwtrimTHtmmmmtwqa. (b) F I G . 5. U l t r a s o n i c c a r d i o g r a m s (kindly m a d e available b y D r . J . W i r t h , I I Medical Clinic, Charite H o s p i t a l , Berlin), (a) N o r m a l ultrasonic c a r d i o g r a m (angle a l p h a = 76°); a b o v e , t h e s i m u l t a n e o u s l y recorded electrocardiogram.

If, on the other hand, a moderate sensitivity level is selected (20-27 mm oil path) the echoes from the interior of the tumour are below the threshold and only the echo of the tumour surface is still shown. Larger fluid-filled cavities, and also blood vessels within the tumour, can of course pro­ duce echoes in some directions, even from the depth, the intensity of which corresponds to that of the surface echoes, but in most tumours at this sensitivity level only those echograms are predominant which dis­ play solely the tumour surface echo on the base line of the vitreous body.

W i r t h , I I Medical Clinic, Charite H o s p i t a l , Berlin), (a) N o r m a l ultrasonic c a r d i o g r a m (angle a l p h a = 76°); a b o v e , t h e s i m u l t a n e o u s l y recorded electrocardiogram. (b) U l t r a s o n i c c a r d i o g r a m in t h e case of a g r a v e mitralstenosis (3rd degree), angle a l p h a = 13°. BIOMEDICAL APPLICATIONS OF ULTRASOUND 29 it as far as the right auricle (under X-ray control). By means of rotating movements, sector scan pictures were formed (diameter of crystal 2 mm, frequency 5 MHz).

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