The extreme polymorphy of the histological structure of the malignant melanoblastoma of the choroid, and the diverse forms of the tumor echogram stimulated the comparative investigation of such tumors in 22 cases. The complicated combination of different histological details cannot be revealed through clinical echo-ophthalmography. However, connections between the histological preparation and the interference picture can be demonstrated subsequently.
The pros and cons of the various B-scan modes are discussed, and the preferences of the combination of the linear scan and the arc scan is eludicated with experimental results. Some techniques of modulation of the intensity of the B-scan oscilloscope are compared, the starting point being an A-scan equipment with a logarithmic gain amplifier. It is concluded that either a differentiated video signal, or a system employing standard pulses are differentiation of the video signal, or a system employing standard pulses after differentiation of the video signal enhances the anatomical outlining of the B-scan pictures. In order to provide quantitative information of the echo-pattern, A-scan pictures have to be made. These pictures are taken at positions with the B-scan display.
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