The authors compare the ultrasound diagnostic results of intraocular tumours by AB-scans (Sonomed B 3000, Sonocare, Sonovision STT-100) with images obtained using computerized B-scan (Sonocare, Sonovision STT-100, Acoustic Tissue Typing ATT) and angiodynopgraphy systems (Quantum Philips).The Sonovision uses a computerized ultrasound spectrum analysis to assess the probability that a given lesion is a certain tumour, rather than another. The ATT system provides diagnostic probability for type B and type E melanoma, for haemangioma and metastatic carcinoma.The Quantum ultrasound equipment was developed for studying the heart and the major blood vessels. It is a colour Doppler that simplifies the Doppler technique, allowing it to study small anatomical parts such as tumourlike lesions of the eye. The Doppler technique ascertains the presence and the velocity of blood flow in the tumours.In presenting the preliminary results with the new techniques the authors are aware that the ATT system is not designed for some of the lesions under study (melanomas after conservative radiotherapy).

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The authors describe the utilization of the log-likelihood statistic as a means to establish the impact of diagnostic sonography on gastroenteric pathology. The statistical method does not require a final diagnosis, but gives an evaluation of how the clinician's opinion is changed or not by the sonographic diagnosis.