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a) Linear gold (5.0 mm length and 0.5 mm diameter) fiducial marker (white star; Visicoil™ IBA Dosimetry, Bartlett, TN, USA). Reproduced from [47] with permission. b) Coil-spring (diamond-shaped 3:2 mm) fiducial marker (black star; Tornado®, Cook Medical, Bloomington, IN, USA). In the left part of the photograph, the distal part of the Progreat® (Terumo, Shibuya, Japan) guidewire (black arrow) inserted in the microcatheter (white arrow) can be seen.
