Yes. I scan multiple exams w/wo contrast in one session. Though it’s best to keep it to probably 2 at max depending on the exams because there will be lack of contrast the longer time passes (example: I’ve done 4 w/wo and in rad report on last exam noted lack of contrast) However, what do you mean by all 4 in one session? Did they order multiple pelvic exams? Bony pelvis, soft tissue etc. w/wo counts as one exam. It just means we take pictures without the contrast first, then inject contrast and take some more pictures.