title: Fluoroscopic bone fragment tracking for surgical navigation in femur fracture reduction by incorporating optical tracking of hip joint rotation center.
abstract: A new method for fluoroscopic tracking of a proximal bone fragment in femoral fracture reduction is presented. The proposed method combines 2-D and 3-D image registration from single-view fluoroscopy with tracking of the head center position of the proximal femoral fragment to improve the accuracy of fluoroscopic registration without the need for repeated manual adjustment of the C-arm as required in stereo-view registrations. Kinematic knowledge of the hip joint, which has a positional correspondence with the femoral head center and the pelvis acetabular center, allows the position of the femoral fragment to be determined from pelvis tracking. The stability of the proposed method with respect to fluoroscopic image noise and the desired continuity of the fracture reduction operation is demonstrated, and the accuracy of tracking is shown to be superior to that achievable by single-view image registration, particularly in depth translation.
authors.affiliation: School of Engineering, The University of Tokyo, Tokyo 113-8657, Japan. nakajima@iml.u-tokyo.ac.jp
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Nakajima
authors.forename: Takahito
authors.initials: T
authors.lastname: Tashiro
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Sugano
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yonenobu
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Koyama
authors.forename: Yuki
authors.initials: Y
authors.lastname: Maeda
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Tamura
authors.forename: Masanobu
authors.initials: M
authors.lastname: Saito
authors.forename: Shin'ichi
authors.initials: S
authors.lastname: Tamura
authors.forename: Mamoru
authors.initials: M
authors.lastname: Mitsuishi
authors.forename: Naohiko
authors.initials: N
authors.lastname: Sugita
authors.forename: Ichiro
authors.initials: I
authors.lastname: Sakuma
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ochi
authors.forename: Yoichiro
authors.initials: Y
authors.lastname: Matsumoto
mesh_terms: D005264:Femoral Fractures / Q000503:physiopathology* / Q000601:surgery*; D005269:Femur / Q000000981:diagnostic imaging* / Q000601:surgery*; D005471:Fluoroscopy / Q000379:methods*; D006621:Hip Joint / Q000503:physiopathology*; D006801:Humans; D055095:Optics and Photonics; D015641:Radiography, Interventional / Q000379:methods; D012399:Rotation; D025321:Surgery, Computer-Assisted / Q000379:methods*