title: Correction of rotational distortion for catheter-based en face OCT and OCT angiography.
abstract: We demonstrate a computationally efficient method for correcting the nonuniform rotational distortion (NURD) in catheter-based imaging systems to improve endoscopic en face optical coherence tomography (OCT) and OCT angiography. The method performs nonrigid registration using fiducial markers on the catheter to correct rotational speed variations. Algorithm performance is investigated with an ultrahigh-speed endoscopic OCT system and micromotor catheter. Scan nonuniformity is quantitatively characterized, and artifacts from rotational speed variations are significantly reduced. Furthermore, we present endoscopic en face OCT and OCT angiography images of human gastrointestinal tract in vivo to demonstrate the image quality improvement using the correction algorithm.
authors.forename: Osman O
authors.initials: OO
authors.lastname: Ahsen
authors.forename: Hsiang-Chieh
authors.initials: HC
authors.lastname: Lee
authors.forename: Michael G
authors.initials: MG
authors.lastname: Giacomelli
authors.forename: Zhao
authors.initials: Z
authors.lastname: Wang
authors.forename: Kaicheng
authors.initials: K
authors.lastname: Liang
authors.forename: Tsung-Han
authors.initials: TH
authors.lastname: Tsai
authors.forename: Benjamin
authors.initials: B
authors.lastname: Potsaid
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Mashimo
authors.forename: James G
authors.initials: JG
authors.lastname: Fujimoto
mesh_terms: D000465:Algorithms; D000792:Angiography / Q000295:instrumentation* / Q000592:standards; D016477:Artifacts; D057785:Catheters; D057918:Fiducial Markers; D041981:Gastrointestinal Tract / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D012399:Rotation; D041623:Tomography, Optical Coherence / Q000295:instrumentation* / Q000592:standards