New PDF release: Angiography and Plaque Imaging Advanced Segmentation

By Muhammad Asim Khan

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This step consisted of skeletonization of the vessels. Pros and Cons of Multi-scale with Vessel Model: The major advantages of using this method were: (1) the algorithm used the multi-scale approach for © 2003 by CRC Press LLC 40 Angiography and Plaque Imaging: Advanced Segmentation Techniques vascular segmentation; and (2) the algorithm showed good behavior on junctions and tangent vessels. The major disadvantages of multi-scale with vessel model included (1) the initial model taken was a cylinder, which was too simple for the complex vascular nature of the network; and (2) there was no discussion on the validation.

Interested readers can research this algorithm. 2 Manual Thresholding for Vascular Segmentation Manual and semi-automatic methods are used for vascular visualization and segmentation (see [109, 110]). 18. On the left in this figure is the manually selected threshold for TOF data for a single slice image, with the result of this seen on the right. The process is repeated for the entire volume on a slice-by-slice basis. 18, right). 18 Manual segmentation results. 15 of a bright blood volume MRA TOF SLINKY image using manual thresholding.

The major disadvantages of TOF include: 1. TOF technique is not robust under complicated flow conditions, including slowly flowing blood flow, turbulent blood flow, recirculated and swirling blood flow, which is usually present in tortuous vessels. Under such cases, signal void can appear, falsifying stenoses or occlusions. 2. Depending on the sequence parameters used and flow condition (oblique flow), TOF suffers from the phase shift effect, which causes misregistration between vessel lumen and blood flow, resulting in distortion (the flow images are not identical to the vessel lumen).

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