3-D shape measurement endoscope using a single-lens system

Abstract Purpose A three-dimensional (3-D) shape measurement endoscopic technique is proposed to provide depth information, which is lacking in current endoscopes, in addition to the conventional surface texture information. The integration of surface texture and 3-D shapes offers effective analytical data and can be used to detect unusual tissues. We constructed a prototype endoscope to validate our method. Methods A 3-D measurement endoscope using shape from focus is proposed in this paper. It employs a focusing part to measure both texture and 3-D shapes of objects. Image focusing is achieved with a single-lens system. Results A prototype was made in consideration of proper endoscope sizes. We validated the method by experimenting on artificial objects and a biological object with the prototype. First, the accuracy was evaluated using artificial objects. The RMS errors were 0.87 mm for a plate and 0.64 mm for a cylinder. Next, inner wall of pig stomach was measured in vitro to evaluate the feasibility of the proposed method. Conclusion The proposed method was efficient for 3-D measurement with endoscopes in the experiments and is suitable for downsizing because it is a single-lens system..

Medienart:

E-Artikel

Erscheinungsjahr:

2012

Erschienen:

2012

Enthalten in:

Zur Gesamtaufnahme - volume:8

Enthalten in:

International journal of computer assisted radiology and surgery - 8(2012), 3 vom: 16. Okt., Seite 451-459

Sprache:

Englisch

Beteiligte Personen:

Takeshita, Takaaki [VerfasserIn]
Kim, Minkyu [VerfasserIn]
Nakajima, Yoshikazu [VerfasserIn]

Links:

Volltext [lizenzpflichtig]

Themen:

3-D measurement
3-D measurement endoscope
Depth from focus
Endoscope
Shape from focus

Anmerkungen:

© CARS 2012

doi:

10.1007/s11548-012-0794-2

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

OLC2087217777

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