The depth indicators on the catheter sheath are used to calculate the insertion distance prior to fluoroscopy. The imaging catheter is advanced until it passes the target lesion while the operator monitors the marker near the imaging catheter's tip on a fluoroscopic X-ray image. The motor of the MDU is turned back on to resume sensor rotation once the target lesion has been passed, and an IVUS image is displayed on the console Guidewires Market. With the MDU, the operator can either manually or automatically pull the catheter back while acquiring multislice IVUS images. The target lesion's position and length can be determined automatically by pulling back the catheter with the MDU.
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