title: Interactive registration between supine and prone scans in computed tomography colonography using band-height images.
abstract: In computed tomographic colonography (CTC), a patient is commonly scanned twice including supine and prone scans to improve the sensitivity of polyp detection. Typically, a radiologist must manually match the corresponding areas in the supine and prone CT scans, which is a difficult and time-consuming task, even for experienced scan readers. In this paper, we propose a method of supine-prone registration utilizing band-height images, which are directly constructed from the CT scans using a ray-casting algorithm containing neighboring shape information. In our method, we first identify anatomical feature points and establish initial correspondences using local extreme points on centerlines. We then correct correspondences using band-height images that contain neighboring shape information. We use geometrical and image-based information to match positions between the supine and prone centerlines. Finally, our algorithm searches the correspondence of user input points using the matched anatomical feature point pairs as key points and band-height images. The proposed method achieved accurate matching and relatively faster processing time than other previously proposed methods. The mean error of the matching between the supine and prone points for uniformly sampled positions was 18.41±22.07mm in 20 CTC datasets. The average pre-processing time was 62.9±8.6s, and the interactive matching was performed in nearly real-time. Our supine-prone registration method is expected to be helpful for the accurate and fast diagnosis of polyps.
authors.affiliation: School of Computer Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, South Korea. Electronic address: silent_ivory@cglab.snu.ac.kr.
authors.forename: Youngchan
authors.initials: Y
authors.lastname: Song
authors.affiliation: Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 138-736, South Korea. Electronic address: HyunnaLee@gmail.com.
authors.forename: Hyunna
authors.initials: H
authors.lastname: Lee
authors.affiliation: School of Electronics & Information Engineering, Korea University Sejong Campus, 2511 Sejong-ro, Sejong City 339-770, South Korea. Electronic address: hckang@cglab.snu.ac.kr.
authors.forename: Ho Chul
authors.initials: HC
authors.lastname: Kang
authors.affiliation: Department of Systems Management Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeong gi-do, 440-746 South Korea. Electronic address: jsshin@skku.edu.
authors.forename: Juneseuk
authors.initials: J
authors.lastname: Shin
authors.affiliation: Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 138-736, South Korea. Electronic address: hgs2013@gmail.com.
authors.forename: Gil-Sun
authors.initials: GS
authors.lastname: Hong
authors.affiliation: Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 138-736, South Korea. Electronic address: parksh.radiology@gmail.com.
authors.forename: Seong Ho
authors.initials: SH
authors.lastname: Park
authors.affiliation: School of Computer Science and Engineering, Soongsil University, 369 Sangdo-Ro, Dongjak-Gu, Seoul 156-743, South Korea. Electronic address: leejeongjin@ssu.ac.kr.
authors.forename: Jeongjin
authors.initials: J
authors.lastname: Lee
authors.affiliation: School of Computer Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, South Korea. Electronic address: yshin@snu.ac.kr.
authors.forename: Yeong-Gil
authors.initials: YG
authors.lastname: Shin
mesh_terms: D000328:Adult; D000465:Algorithms; D003106:Colon / Q000000981:diagnostic imaging*; D003111:Colonic Polyps / Q000000981:diagnostic imaging; D023881:Colonography, Computed Tomographic / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D016684:Prone Position / Q000502:physiology*; D016683:Supine Position / Q000502:physiology*
keywords: Band-height image; CT colonography; Colon centerline matching; Colon registration; Interactive registration