METHOD FOR EVALUATING SPATIAL INTRAOCULAR FORMATIONS FROM THEIR ULTRASONIC IMAGES Russian patent published in 2002 - IPC

FIELD: medicine. SUBSTANCE: method involves using multifunctional ultrasonic scanner for building amplitude histograms. Transpalpebral contact scanning method is applied so that plane of eyeball scanning is not allowed to have intersection Standard constant values of brightness and contrast, emitted and reflected ultrasonic flow power are set with the exception of reflected G signal inputted by means of amplifying potentiometer handle for carrying out investigations that enables one to build optimum spatial intraocular formation images on the display screen in the range of 40-80 Db. Ultrasonic grayscale scanning is carried out first in real-time mode for determining dimensions and position of the spatial intraocular formations. Then, Histogram function is run for building amplitude histogram after manually drawing the boundaries of the zone of interest (spatial intraocular formation). Three values of T, L and M are calculated, where T is the total number of elements in the outlined zone having any gray color tint, L is the gray scale tint level (as one of 64 potential gradation degrees) which is the most frequently observable in the outlined zone, M is the number of elements the maximum frequency gray color tint observed in the outlined zone. The M/T x 100 ratio is calculated that describes homogeneity degree of the tissue under investigation denoted as IH (homogeneity index). The L/G ratio is determined as one depending on echogenicity degree of the tissue under investigation denoted as IE (echogenicity index). The values of the indices are interpreted in terms of vascular eye coat melanoma or pseudotumor formation availability. EFFECT: high accuracy of diagnosis that enables one to differentiate between choroid melanoma and pseudotumor cases including ones occurring in nontransparent optical media of the eye. 2 tbl