The goal of this work was the assessment of capability for multidetector computed tomography (MDCT) in the diag-nostics of retroperitoneal tumors in children. We studied the results of multidetector computed tomography of 63sick children (36 boys (58%) and 27 girls (42%)) between the ages of 1 month to 16 years, from 2012 to 2015. The aver-age age of the patients was 4.9±4.5 years, with a predominance of boys (2:1.4). Among retroperitoneal tumors in children most often we found neuroblastoma (50.8%): in 38.1% it was detected in boys, in 12.7% – in girls (p<0.05). Nephroblastoma was detected in 10%, the other retroperitoneal tumors accounted for 40%. In 56% neuroblastoma was located at the upper level of retroperitoneal space. In 44% tumors localized in para-aortic area, in paravertebral space or in the pelvis. Neuroblastomas on MDCT scans were presented by heterogeneous formations, unevenly accumu-lating contrast. In 62% of cases we detected calcifications, in 19% we observed cysts and in 56% of cases there were metastatic involvements detected. Thus, the MDCT is a method able to accurately specify the localization of the tumor, to clarify the character and volume of destruction, to determine the exact size of a tumor and its relationship with the surrounding tissues, as well as to reveal metastatic lesions in the abdominal cavity and in other organs.

The article presents the feasibility of application of the method of multidimensional phase spaces, based on the methods of calculating the quasi-attractor parameters as a quantitative measure of the chaotic dynamics of the tremor. The measure is used in two-dimensional quasi-attractor phase space. The quasi-attractor square is used for the identification of the actual changes in the parameters of the functional state of the organism with no load and under static loads. Specifically, the static load provides the threefold increasing of the area of quasi-attractor (from 0.31 to 0.99 cu under load of 300 g). This is a quantitative measure of the body´s reaction to changes. It was proved that calculation of quasi-attractor parameters demonstrated at three phase space more statistical stable picture then two dimensional quasi-attractors.

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