title: Creation of individual ideally shaped stents using multi-slice CT: in vitro results from the semi-automatic virtual stent (SAVS) designer.
abstract: To plan stent-grafting for thoracic aortic aneurysm with complicated morphology, we created a virtual stent-grafting program [Semi Automatic Virtual Stent (SAVS) designer] using three-dimensional CT data. The usefulness of the SAVS designer was evaluated by measurement of transformed anatomical and straight stents. Curved model images (source, multi-planer reconstruction and volume rendering) were created, and a hollow virtual stent was produced by the SAVS designer. A straight Nitinol stent was transformed to match the curved configuration of the virtual stent. The accuracy of the anatomical stent was evaluated by experimental strain phantom studies in comparison with the straight stent. Mean separation length was 0 mm in the anatomical stent [22 mm outer diameter (OD)] and 5 mm in the straight stent (22 mm OD). The straight stent strain voltage was four times that of the anatomical stent at the stent end. The anatomical stent is useful because it fits the curved structure of the aorta and reduces the strain force compared to the straight stent. The SAVS designer can help to design and produce the anatomical stent.
authors.affiliation: Department of Radiology, Sapporo Medical University, S-1 W-16 Chuo-ku, Sapporo, 060-8543, Japan. hyodoh@sapmed.ac.jp
authors.forename: Hideki
authors.initials: H
authors.lastname: Hyodoh
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Katagiri
authors.forename: Toyohiko
authors.initials: T
authors.lastname: Sakai
authors.forename: Kazusa
authors.initials: K
authors.lastname: Hyodoh
authors.forename: Hidenari
authors.initials: H
authors.lastname: Akiba
authors.forename: Masato
authors.initials: M
authors.lastname: Hareyama
mesh_terms: D000497:Alloys; D017545:Aortic Aneurysm, Thoracic / Q000601:surgery; D019917:Blood Vessel Prosthesis Implantation; D004867:Equipment Design; D006801:Humans; D021621:Imaging, Three-Dimensional; D066298:In Vitro Techniques; D012984:Software; D015607:Stents; D014057:Tomography, X-Ray Computed; D014584:User-Computer Interface
chemical_list: D000497:Alloys; C013616:nitinol