naa a22 4500 51080697X CHVBK 20180411083423.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11548-012-0678-5 doi (NATIONALLICENCE)springer-10.1007/s11548-012-0678-5 A beam-splitter-type 3-D endoscope for front view and front-diagonal view images [Elektronische Daten] [Hiroki Kamiuchi, Ken Masamune, Kenta Kuwana, Takeyoshi Dohi, Keri Kim, Hiromasa Yamashita, Toshio Chiba] Purpose: In endoscopic surgery, surgeons must manipulate an endoscope inside the body cavity to observe a large field-of-view while estimating the distance between surgical instruments and the affected area by reference to the size or motion of the surgical instruments in 2-D endoscopic images on a monitor. Therefore, there is a risk of the endoscope or surgical instruments physically damaging body tissues. To overcome this problem, we developed a Ø7-mm 3-D endoscope that can switch between providing front and front-diagonal view 3-D images by simply rotating its sleeves. Methods: This 3-D endoscope consists of a conventional 3-D endoscope and an outer and inner sleeve with a beam splitter and polarization plates. The beam splitter was used for visualizing both the front and front-diagonal view and was set at 25° to the outer sleeve's distal end in order to eliminate a blind spot common to both views. Polarization plates were used to avoid overlap of the two views. We measured signal-to-noise ratio (SNR), sharpness, chromatic aberration (CA), and viewing angle of this 3-D endoscope and evaluated its feasibility in vivo. Results: Compared to the conventional 3-D endoscope, SNR and sharpness of this 3-D endoscope decreased by 20 and 7%, respectively. No significant difference was found in CA. The viewing angle for both the front and front-diagonal views was about 50°. In the in vivo experiment, this 3-D endoscope can provide clear 3-D images of both views by simply rotating its inner sleeve. Conclusions: The developed 3-D endoscope can provide the front and front-diagonal view by simply rotating the inner sleeve, therefore the risk of damage to fragile body tissues can be significantly decreased. CARS, 2012 3-D endoscope nationallicence Field-of-view nationallicence Beam splitter nationallicence Polarization plate nationallicence Minimally invasive surgery nationallicence Kamiuchi Hiroki Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan aut Masamune Ken Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan aut Kuwana Kenta Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan aut Dohi Takeyoshi Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan aut Kim Keri Clinical Research & Development, National Center for Child Health and Development, Tokyo, Japan aut Yamashita Hiromasa Clinical Research & Development, National Center for Child Health and Development, Tokyo, Japan aut Chiba Toshio Clinical Research & Development, National Center for Child Health and Development, Tokyo, Japan aut International Journal of Computer Assisted Radiology and Surgery Springer-Verlag 8/1(2013-01-01), 111-120 1861-6410 8:1<111 2013 8 11548 https://doi.org/10.1007/s11548-012-0678-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11548-012-0678-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kamiuchi Hiroki Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan aut NATIONALLICENCE 700 1- Masamune Ken Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan aut NATIONALLICENCE 700 1- Kuwana Kenta Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan aut NATIONALLICENCE 700 1- Dohi Takeyoshi Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan aut NATIONALLICENCE 700 1- Kim Keri Clinical Research & Development, National Center for Child Health and Development, Tokyo, Japan aut NATIONALLICENCE 700 1- Yamashita Hiromasa Clinical Research & Development, National Center for Child Health and Development, Tokyo, Japan aut NATIONALLICENCE 700 1- Chiba Toshio Clinical Research & Development, National Center for Child Health and Development, Tokyo, Japan aut NATIONALLICENCE 773 0- International Journal of Computer Assisted Radiology and Surgery Springer-Verlag 8/1(2013-01-01), 111-120 1861-6410 8:1<111 2013 8 11548 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer