REF TAC -DIAGNOSTICS FOR IMAGES

REF TAC -DIAGNOSTICS FOR IMAGES
LACK OF ATTENTION IN THE NEEDLE CANNULA POSITIONING FOR THE INFUSION OF CONTRAST LIQUID.
IN MY CASE THERE WAS CAREFUL OF BREAKING THE VEIN RESULTING IN PAYMENT OF LIQUID CONTRAST IN JOINT subjecting PATIENT TO A DOUBLE DOSE OF THE SAME AND PROBLEMS AFTER REVIEW
QUESTION:
WHAT IS THE CONTRAST LIQUID IF THE OPERATOR DOES NOT OBSERVE THAT WHERE HAD NOT ARRIVED TO GET THERE?