This paper deals with the characteristics of ultrasonic systems for applications in medicine. Ultrasound is a non-invasive diagnostic, therapeutical and surgical tool that uses sound waves to create visual images, increase the tissue circulation and as surgical tool for tissue fragmentation and distruction. Diagnostic ultrasound exposes body parts to high-frequency sound waves to get images of the inside of the body. It is applied in almost all branches of medicine, primarily in diagnostics, but is also used in therapy and surgery. In medical diagnostics, ultrasonic frequencies are often used between 1-15 MHz (recently frequencies of 20-40 MHz) In the theoretical part of the paper, the basic parameters of the ultrasonic field and its use in medicine will be analyzed. It will also provide an overview of ultrasound systems for diagnostic, therapeutic and surgical applications. In the practical part, the ultrasonic system will be characterized for use in surgical operations with regard to the electric power delivered and the resulting strength and effect in the treated medium characterized by acoustic pressure and displacement of sonotrode. Electromechanical parameters will be determined by measuring the electrical impedance around the resonant mode of titration at a small level of the initiation and will determine the outlet sound pressure in the water.