Guidewires and related methods for percutaneous crossing of an occlusion in a blood vessel are disclosed. The receiver includes three subsystems: a synchronization system, a carrier tracking system, and a data demodulation system. Calculation of the decoded frame may also be based on a description of temporal information for the second frequency band that is based on information from at least one preceding encoded frame. A charging information table is generated according to the charging information, the charging information table including an association between the phone card ID and the charge for each communication service. 2 gcm3 or less, and a silicon oxide film formed on the silicon nitride film in an ambient atmosphere containing TEOS and O3. Each of the plurality of lens receiving port has a lens receiving face configured to be in contact with at least a part of a support surface which is an end face of each of the plurality of lenses, and an outer circumference of the lens receiving face is positioned higher than the surface of the base portion.