Saitama Medical University

Utsunomiya University

Hokkaido University

Tokyo University of Agriculture and Technology

Lexi Co., Ltd.

Arthrodesign, Ltd.

Toshitaka Wakayama

Yukitoshi Otani

Toru Yoshizawa

Atsushi Taniguchi

Kazuhiko Oka

Norio Seitoku

Takashi Handa

Yukari Kito

CT images near the pelvis are obtained before surgery, and a three-dimensional model of a pelvis part is created on a computer. The virtual three-dimensional bone model is used to plan an installation position of a guide instrument etc., and a virtual three-dimensional surgical site model including the guide instrument is constructed. Subsequently, during surgery, the guide instrument is installed, and three-dimensional images of a surgical site are obtained, and a measured three-dimensional surgical site model including the guide instrument is obtained. The virtual three-dimensional surgical site model and the measured three-dimensional surgical site model are compared, and an error between an ideal installation position of the guide instrument and an actual installation position of the guide instrument is detected to guide the operator to reduce the error.

Navigation device for joint replacement and surgical support device

An axially symmetric polarization conversion element that converts incident light into an axially symmetric polarized beam includes a reflection section having a shape obtained by rotating the cross section of a Fresnel rhomb wave plate along the direction of an optical axis around an axis that is parallel to the optical axis. The axially symmetric polarization conversion element converts the incident light into an axially symmetric polarized beam by utilizing two Fresnel reflections by the reflection section.

Axially symmetric polarization conversion element

An optical characteristic measuring apparatus includes an optical systemincluding first and second carrier retardersandhaving the retardations being known and differing from each other. The optical characteristic measuring apparatus performs: a spectrum extraction process of extracting a plurality of spectral peaks from a frequency spectrum obtained by analyzing a light intensity signal detected by light-receiving/spectroscopic means; and an optical characteristic element calculation process of calculating an optical characteristic element representing optical characteristics of a measurement target based on the spectral peaks and the retardations of the first and second carrier retarders.

Optical characteristic measuring apparatus and optical characteristics measuring method

A measuring apparatus includes a light intensity information acquisition sectionthat acquires light intensity information relating to a measurement light containing a given band component, the measurement light having been modulated by optical elements included in an optical systemand a measurement target (or a sample), and a calculation sectionthat calculates at least one matrix element of a Mueller matrix that indicates the optical characteristics of the measurement target based on the light intensity information relating to the measurement light and a theoretical expression for the light intensity of the measurement light. The light intensity information acquisition sectionacquires the light intensity information relating to a plurality of the measurement lights obtained from the optical systemby changing setting of a principal axis direction of at least one of the optical elements. The calculation sectionperforms a carrier amplitude coefficient calculation process, and a matrix element calculation process that calculates the at least one matrix element based on a carrier amplitude coefficient and the theoretical expression for the carrier amplitude coefficient including the at least one matrix element.

Measuring apparatus, measuring method, and characteristic measurement unit

Growing community of inventors

Saitama, Japan

Toshitaka Wakayama