The prototype of ultrasonic imaging system–attachment for diagnosis of human eye tumours

Abstract

The most important problem in ophthalmology is early-stage diagnosis of malignant tumours of the eye in order to prevent metastasis of cancer and to save the human life. This problem required the development of prototype of ultrasonic imaging system-attachment for conventional non-invasive ultrasonic diagnostic equipment.
The performed experimental study shows that the developed data acquisition system is suitable to acquire, synchronise and digitize with a higher sample rate and amplitude resolution (not less than 200 MHz and 12 bits), also to store the ultrasonic diagnostic signals, which are received from conventional ophthalmological scanners. These stored raw ultrasonic signals can be further processed using advanced digital signal processing algorithms, independently from the basic features installed into a conventional medical diagnostic equipment. The experimental research has revealed the tasks of improvement of the developed system, like reduction of the own noise level of the preamplifier, optimization of the time varying gain law, selection of cut-off frequencies of the band-pass filters and necessity to acquire the signals reflected from the internal structure of eye.