Three-Dimensional Imaging of Laryngeal Cancers Using High-Speed Helical CT Scanning

Sakakura, Atsushi; Yamamoto, Y.; Uesugi, Yasuo; Nakai, Ken; Takenaka, Hiroshi; Narabayashi, Isamu

doi:10.1159/000027574

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…The main task of the segmentation sub-unit is to extract structures of interest, i.e., the constituent parts of the bony anatomy from the pCT dataset. Using a threshold value of +166 HU, bony as well as the cartilaginous structures are segmented (Sakakura et al 1998). By sorting the resulting structures by volume, the largest structure consisting of skull, vertebral column, clavicles and rib cage, is isolated from the background.…”

Section: Integrated Mroi Systemmentioning

confidence: 99%

Automatic detection system for multiple region of interest registration to account for posture changes in head and neck radiotherapy

Mencarelli¹,

Beek²,

Zijp³

et al. 2014

Phys. Med. Biol.

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Despite immobilization of head and neck (H and N) cancer patients, considerable posture changes occur over the course of radiotherapy (RT). To account for the posture changes, we previously implemented a multiple regions of interest (mROIs) registration system tailored to the H and N region for image-guided RT correction strategies. This paper is focused on the automatic segmentation of the ROIs in the H and N region. We developed a fast and robust automatic detection system suitable for an online image-guided application and quantified its performance. The system was developed to segment nine high contrast structures from the planning CT including cervical vertebrae, mandible, hyoid, manubrium of sternum, larynx and occipital bone. It generates nine 3D rectangular-shaped ROIs and informs the user in case of ambiguities. Two observers evaluated the robustness of the segmentation on 188 H and N cancer patients. Bland-Altman analysis was applied to a sub-group of 50 patients to compare the registration results using only the automatically generated ROIs and those manually set by two independent experts. Finally the time performance and workload were evaluated. Automatic detection of individual anatomical ROIs had a success rate of 97%/53% with/without user notifications respectively. Following the notifications, for 38% of the patients one or more structures were manually adjusted. The processing time was on average 5 s. The limits of agreement between the local registrations of manually and automatically set ROIs was comprised between ±1.4 mm, except for the manubrium of sternum (-1.71 mm and 1.67 mm), and were similar to the limits agreement between the two experts. The workload to place the nine ROIs was reduced from 141 s (±20 s) by the manual procedure to 59 s (±17 s) using the automatic method. An efficient detection system to segment multiple ROIs was developed for Cone-Beam CT image-guided applications in the H and N region and is clinically implemented in our department.

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Section: Integrated Mroi Systemmentioning

confidence: 99%

Automatic detection system for multiple region of interest registration to account for posture changes in head and neck radiotherapy

Mencarelli¹,

Beek²,

Zijp³

et al. 2014

Phys. Med. Biol.

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“…The stereoscopic display of three-dimensional images (stereograms) is now widely used with new developments in both computer software and hardware. There have been several reports on threedimensional imaging of the larynx using helical CT. Its clinical usefulness and limitations, especially for preoperative planning of a tumor resection, have been investigated extensively [5][6][7][8][9][10]. However, studies on stereograms with three-dimensional CT images of the larynx and hypopharynx have not been reported.…”

Section: Introductionmentioning

confidence: 99%

Stereoscopic Display of a Three-Dimensional Image of the Larynx Using High-Speed Helical Scanning

Sakakura¹,

Yamamoto²,

Uesugi

et al. 2000

ORL

Self Cite

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To evaluate the usefulness of stereoscopic images of larynges using helical CT in stereo mode, a retrospective review of the characteristics of stereoscopic viewing of larynges was made. The subjects were 3 patients with laryngeal cancer, 1 patient with laryngeal leiomyosarcoma and 1 patient with an advanced tongue carcinoma whose formalin-fixed larynx was extirpated. The larynges were scanned by high-speed helical CT using 1- to 2-mm slices. The reproduction of stereographic images was performed by the manipulation and rotation of three-dimensional structures around the y-axis on the computer display. The three-dimensional images of the complex structures, such as the arytenoid cartilage, aryepiglottic fold and pyriform sinus, were better observed by binocular images (stereograms) than by monocular images. Stereoscopic views of the larynx are useful in producing three-dimensional images of the unseen inner surface of the human body.

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Virtual Laryngoscopy

Kettenbach¹,

Birkfellner²,

Sorantin³

et al. 2008

Medical Radiology

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Three-Dimensional Imaging of Laryngeal Cancers Using High-Speed Helical CT Scanning

Cited by 6 publications

References 8 publications

Automatic detection system for multiple region of interest registration to account for posture changes in head and neck radiotherapy

Automatic detection system for multiple region of interest registration to account for posture changes in head and neck radiotherapy

Stereoscopic Display of a Three-Dimensional Image of the Larynx Using High-Speed Helical Scanning

Virtual Laryngoscopy

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