Fluid paths for angiography injector assembly

A fluid injector system comprising:

• at least one syringe configured for injecting medical fluid;
• a fluid path assembly in fluid communication with the at least one syringe, the fluid path assembly comprising a plurality of individual parallel tubes and at least one air detection region;
• an air detector configured to detect one or more air bubbles in a fluid path associated with the at least one air detection region;
• at least one shutoff valve at a distal end of the fluid path assembly;
• and
• at least one processor programmed or configured to actuate the at least one shutoff valve in response to the air detector detecting the one or more air bubbles in the fluid path associated with the air detection region to prevent fluid flow out of the fluid path assembly,
• wherein the plurality of individual parallel tubes are connected to one another in series by a plurality of u-turn elements,
• wherein the plurality of u-turn elements defines a 180° turn to divert fluid flow from one of the plurality of tubes to another of the plurality of individual parallel tubes,
• wherein the plurality of u-turn elements are formed in a pair of end caps,
• wherein the pair of end caps are joined to open ends of the plurality of individual parallel tubes to form a fluid path between an inlet port and an outlet port, and
• wherein the fluid path assembly has a length greater than a distance that an air bubble can travel or expand during an actuation time of the at least one shutoff valve.