FIELD: medicine.SUBSTANCE: group of inventions refers to medicine, namely to medical images processing, and can be used for determination of liver boundaries. Method for determining a liver boundary comprises: obtaining information on the determined liver tissue; determining the liver tissue boundary in the hepatic tissue information by the specific properties of the tissue and its boundary corresponding to the liver tissue information using image processing technology or signal processing technology; and outputting information on the location of the identified liver tissue boundary. Information on liver tissue is a one-dimensional ultrasonic signal of liver tissue or a two-dimensional image of liver tissue. Information on the location of the identified liver tissue boundary comprises: inferring the coordinates of a defined liver tissue boundary and/or displaying an image of a defined liver tissue boundary. Determining the liver tissue boundary in the liver tissue information by the specific properties of the tissue and its boundary, corresponding to the liver tissue information, using image processing technology or signal processing technology comprises: separating liver tissue information into a plurality of detection sub-regions; and calculating the value of the characteristic property from information on liver tissue in each of the sub-regions of detection and determining the boundary of liver tissue in accordance with the value of the characteristic property in the information on liver tissue in the detection subarea. Liver boundary detection system comprises: an information acquisition device, a liver boundary determination device and a liver boundary display device. Device for obtaining information is configured to obtain information on the determined liver tissue. Liver boundary determination device configured to determine a liver tissue boundary in the hepatic tissue information by the specific properties of the tissue and its boundary corresponding to the liver tissue information using image processing technology or signal processing technology. Liver boundary display device configured to display information on the position of a defined liver tissue boundary. Information on liver tissue is a one-dimensional ultrasonic signal of liver tissue or a two-dimensional image of liver tissue. Liver boundary display device comprises: a position output unit configured to output coordinates of a defined liver tissue boundary, and/or an image display unit configured to display an image of a defined liver tissue boundary. At that, the liver boundary detection device further comprises: a region separation unit configured to separate information on liver tissue into a plurality of detection subareas, and a boundary determination unit configured to calculate a characteristic property value from information on liver tissue in each of the subregions of detecting and determining the liver tissue boundary by the value of the characteristic properties in the liver tissue information in the detection subarea.EFFECT: group of inventions provides determining the liver boundary by using image processing technologies or signal processing techniques.6 cl, 8 dwg