Patent ID: 8359087

Claim:
A liquid injector for injecting at least a contrast medium into a subject whose fluoroscopic image is to be captured by an imaging diagnostic apparatus, wherein said contrast medium is available in a plurality of types having different concentrations of an effective component, said liquid injector comprising: a liquid injection mechanism for injecting at least said contrast medium into said subject; an injection control means for controlling operation of said liquid injection mechanism under operating conditions whose data have been read; a display/touch panel adapted to display a plurality of body sections in schematic images of shapes of a human body and accept selection of one of said body sections when one of the displayed plurality of body sections is touched, wherein when one of the body sections is selected, said display/touch panel is further adapted to display at least one of a plurality of regions to be imaged of the human body in schematic images of shapes of regions and accept selection of one of said regions to be imaged when one of the displayed regions to be imaged is touched; and said injection control means is configured (i) to read out, from a condition storage device, a base-operation condition including data of: a predetermined injection time for the injection corresponding to the selected region, a necessary dose of effective component of the contrast medium per unit weight of the subject corresponding to the selected region, a concentration of the effective component, and a variable pattern of an injection rate, (ii) to calculate a necessary volume of the contrast medium based on the read out necessary dose of effective component per unit weight, the weight of the subject, and the concentration of the effective component, (iii) to make an injection pattern based on the calculated necessary volume of the contrast medium and the base-operation condition, and (iv) to perform the injection of said contrast medium based on the injection pattern by controlling the operation of said liquid injection mechanism, wherein the injection rate of the base-operation condition is configured to be changed based on the calculated necessary volume of said contrast medium, and wherein the predetermined injection time is unchanged, for all volumes of the contrast medium, when making the injection pattern, whereby a timing of an optimum concentration of the contrast medium will be substantially unchanged for all volumes of the contrast medium.