A method and system for identifying a rotational orientation of an implanted electrical stimulation lead utilize radiological images of the lead. The lead has an asymmetric marker with a longitudinal band extending around a portion of the circumference of the lead. The method and system includes obtaining radiological images of the lead； generating an isosurface image from the radiological images and displaying the isosurface image on a display device, where the isosurface image comprises an image of the longitudinal band of the marker； identifying a bulge in the isosurface image corresponding the longitudinal band of the marker； and determining a rotational orientation of the lead based on the rotational orientation of the bulge in the isosurface image.
