An image forming device includes an image forming unit and a thermal fixing unit. Marking the balloon facilitates positioning of the balloon on a catheter and facilitates positioning a medical device on the balloon. A method of manufacturing the walkway pad is also provided. A screw hole can be screwed in with the rotatable bolt seat, having a perfect look without holes and simplifying the structure so that assembling is more convenient and practical. A substantially defect-free titanium aluminide component comprises a compacted three-dimensional article comprised of titanium aluminide and formed by a consolidation process and an aluminum-containing encapsulation layer on at least one surface of the compacted three-dimensional article. A determination unit determines distance r between the center and the feature from an angular velocity \u03c9 of the reference beam over the feature and from times tr, t1.