1. A system for imaging with an intra-patient catheter, the system comprising: an ultrasound element in a catheter; a marker connected with the catheter at a portion of the catheter, wherein the marker is integrated in the catheter to be repositionable relative to the portion of the catheter while the catheter is within a patient; an imaging modality configured to sequentially scan a patient while the catheter is within the patient, the marker being repositioned at different locations relative to the ultrasound element between different scans of the sequential scans; and a processor configured to register an ultrasound image acquired with the ultrasound element with an image of the imaging modality as a function of the marker being repositioned at the different locations relative to the ultrasound element.