title: [A-mode ultrasonic pointer for navigated pelvic surgery].
abstract: Surgical navigation has proven to be a minimally invasive procedure that enables precise surgical interventions with reduced exposure to irradiation for patient and personnel. Fluoroscopy-based modules have prevailed on the market. For certain operations of the pelvis computed tomography is necessary with its high imaging quality and considerably larger scan volume. To enable navigation in these cases, matching of the CT data set and the patient's real pelvic bone is essential. The common pair point-matching algorithm is complemented by the surface-matching algorithm to achieve an even higher overall precision of the system. For conventional surface matching with a solid pointer, the bone has to be exposed from soft tissue quite extensively, using a solid pointer. This conflicts with the claim of computer-assisted surgery to be minimally invasive. We integrated an A-mode ultrasonic pointer with the intention to perform extended surface matching on the pelvic bone noninvasively. Related to the conventional method, comparable and to some extent even improved precision conditions could be established.
authors.affiliation: Unfallchirurgische Klinik, Medizinische Hochschule Hannover, Carl-Neuberg-Strasse 1, 30625 Hannover. oszwald.markus@mh-hannover.de
authors.forename: M
authors.initials: M
authors.lastname: Oszwald
authors.forename: M
authors.initials: M
authors.lastname: Citak
authors.forename: J
authors.initials: J
authors.lastname: Kowal
authors.forename: C
authors.initials: C
authors.lastname: Amstutz
authors.forename: D
authors.initials: D
authors.lastname: Kendoff
authors.forename: T
authors.initials: T
authors.lastname: Kirchhoff
authors.forename: L P
authors.initials: LP
authors.lastname: Nolte
authors.forename: C
authors.initials: C
authors.lastname: Krettek
authors.forename: T
authors.initials: T
authors.lastname: Hüfner
mesh_terms: D001863:Bone Screws; D004867:Equipment Design; D005593:Fracture Fixation, Internal / Q000295:instrumentation; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D019060:Minimally Invasive Surgical Procedures / Q000295:instrumentation*; D010384:Pelvic Bones / Q000000981:diagnostic imaging* / Q000601:surgery*; D019047:Phantoms, Imaging; D012680:Sensitivity and Specificity; D025321:Surgery, Computer-Assisted / Q000295:instrumentation*; D014057:Tomography, X-Ray Computed / Q000295:instrumentation; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation*; D014584:User-Computer Interface