Advances in Biomedical Engineering by R. Kenedi (Eds.)

By R. Kenedi (Eds.)

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9, with an oil distance of 10 mm). The possibility of confusion between 9, 6, and 7 and between 3 and 4 can only be precluded if all the stated, accurately measured, sensitivity settings are used. The scheme has been prepared by using ultrasonic diagnostic instru­ ments with linear amplifiers (Kretztechnik) and with a dynamic range of 19 dB between one 5 mm high echo and one 50 mm high echo on the cathode ray tube (approx. 0-4 bB/mm in the linear range). BIOMEDICAL APPLICATIONS OF ULTRASOUND 1Λ PS MMÜ nA fV JyW 47 48 WERNER BUSCHMANN This requires measurement of the overall sensitivity based on the pene­ trated oil path and today is the most important basis for our differential diagnostic decisions.

This is only successful if an adequately high sensitivity is used. This is the cause for disappointing results obtained in the past by some teaching hospitals using material testing equipment. Most com­ mercial material testing equipment reaches a sensitivity level no higher than 25-30 mm oil path in the frequency range necessary for ophthal- BIOMEDICAL APPLICATIONS OF ULTRASOUND 51 mology (9-15 MHz). But sensitivity levels up to at least 55 mm oil path must be available because in examination directions in which the lens lies in the sound field the high losses in sound energy caused by absorption must be compensated by a corresponding increase in the overall sensitivity level selected.

1965) have examined echographically a large number of abdominal conditions. This indicates the major possibilities of ultrasonic diagnosis of the abdominal cavity; however, in order to arrive at a high degree of cer­ tainty in the reliability of an echographic differential diagnosis of the abdominal cavity a great deal of research is still to be done, in particular reproducible echographic results depend on standardization of equip­ ment, probes and methods of examination which should include settings of the apparatus used at any given time.

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