FIELD: medical equipment.SUBSTANCE: group of inventions relates to means of delivering a pharmaceutical liquid to a patient, and especially for delivering a contrast preparation to a patient during a medical injection procedure. Patient visualization system comprises a visualization system and a system parameter generator for visualizing a patient to determine parameters of at least a first phase of the injection procedure, wherein the visualization system comprises a tomograph, comprising at least one X-ray tube, and wherein the parameter generator is programmed to determine at least one of the parameters based on the voltage to be transmitted to at least one X-ray tube during the visualization procedure, wherein the parameter generator is programmed to determine at least one of the volume of the pharmaceutical liquid to be injected during at least the first phase, and the pharmaceutical liquid consumption to be injected during at least the first phase, based on the voltage to be transmitted to at least one X-ray tube during the visualization procedure, wherein the parameter generator is programmed to determine the volume of the pharmaceutical liquid to be injected during at least the first phase, by the volume parameter correction in the basic injection protocol by applying a voltage variation coefficient on the tube to the volume parameter in the basic injection protocol, and wherein the patient visualization system additionally comprises an injector system in functional connection with the parameter generator, and at least one source of pharmaceutical liquid, wherein the injector system is configured to administer the injection of the pharmaceutical liquid during at least a first phase in accordance with the determination of the volume of the pharmaceutical liquid to be injected during at least the first phase. Method of operating a system for controlling an injector system for delivering a pharmaceutical liquid to a patient, as part of a visualization procedure
