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Cone-beam helical CT virtual endoscopy :Reconstruction, segmentation and automatic navigation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Cone-beam helical CT virtual endoscopy :
其他題名:	Reconstruction, segmentation and automatic navigation.
作者:	Carvalho, Bruno Motta de.
面頁冊數:	182 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5030.
附註:	Supervisor: Gabor T. Herman.
Contained By:	Dissertation Abstracts International64-10B.
標題:	Computer Science.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3109160
ISBN:	0496567039

Cone-beam helical CT virtual endoscopy :Reconstruction, segmentation and automatic navigation.
Carvalho, Bruno Motta de.

Cone-beam helical CT virtual endoscopy :Reconstruction, segmentation and automatic navigation. [electronic resource] - 182 p.

Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5030.

Thesis (Ph.D.)--University of Pennsylvania, 2003.

As a result of our segmentation algorithm, strongest "paths" connecting a specific element of the set to any other element of the set are produced. These paths are then smoothed to produce the final navigation paths for the virtual camera of the VE animations.

ISBN: 0496567039Subjects--Topical Terms:

212513
Computer Science.

Cone-beam helical CT virtual endoscopy :Reconstruction, segmentation and automatic navigation.
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520 # $a As a result of our segmentation algorithm, strongest "paths" connecting a specific element of the set to any other element of the set are produced. These paths are then smoothed to produce the final navigation paths for the virtual camera of the VE animations.
520 # $a For the segmentation step, we propose a general multi-object fuzzy segmentation algorithm that segments a set by producing a map that encodes the grades of membership for all elements of this set for all objects. We report on the accuracy and robustness of our algorithm and present segmentations performed on mathematically-defined images as well as images acquired by various modalities, such as CT and MRI.
520 # $a In order to show the applicability of our techniques we perform the three phases of generating a VE on a single data set.
520 # $a Virtual Endoscopy (VE) is a technique in which three-dimensional (3D) data, acquired by an imaging technique such as Computerized Tomography (CT) or Magnetic Resonance Imaging (MRI), is segmented and presented in an animation so as to mimic an endoscopic examination, i.e., as if a camera were introduced into an anatomical structure. It has been shown that the detection rate of small abnormalities in VE is still below acceptable rates, pointing to the fact that there is still a lot of room for improvement in these procedures. This dissertation proposes alternative techniques for the three phases of creating a VE: image reconstruction, segmentation and animation.
520 # $a We propose the use of Algebraic Reconstruction Techniques (ART), and a block-iterative variation of it (block-ART), for reconstructing 3D images from helical cone-beam CT data. For efficiency and accuracy reasons, we implement ART using modified Kaiser-Bessel window functions (also known as blobs) as basis functions that are placed on the body-centered cubic (bcc) grid, instead of the traditionally used voxels of the simple cubic (sc) grid. The accuracy of the reconstructions produced by these algorithms are compared with the ones produced by a fully-3D filtered backprojection algorithm for several data sets, where is shown that ART produced more accurate reconstructions both in the absence and in the presence of realistic simulated noise.
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