A stent having a main body with a proximal end and a distal end section having proximal and distal openings used for treatment of lesions in blood vessels and hollow organs, particularly at the ostium of side branches. The computational processing requirements of the decoder are controlled based on the throttling amount, including reducing the processing performed on the decoded video data prior to displaying a picture associated with the decoded video data. By dynamically determining, while encoding, if either condition applies, and changing the search range accordingly, complexity is reduced and speed can be increased. Etchants used in processes of the present invention comprise a carrier gas, one or more C2+F gases, CH2F2, and a gas selected from the group consisting of CHF3, CF4, and mixtures thereof. Therefore, number of sheets output per unit time can be increased.