Registration of preoperative CT data to intra-operative video images is necessary not only to compare the outcome of the vocal fold after surgery with the preplanned shape but also to provide the image guidance for fusion of all imaging modalities. We propose a 2D-3D registration method using gradient-based mutual information. The 3D CT scan is aligned to 2D endoscopic images by finding the cor...

Geometrical image features like edges and ridges in digital images may be extracted by convolving the images with appropriate derivatives of Gaussians. The choice of the convolution operator and of the parameters of the Gaussian involved de nes a speci c feature image. In this paper, various feature images derived from CT and MR brain images are de ned and tested for usability and robustness in...

Objective: To compare the diagnostic value between magnetic resonance diffusion-weighted imaging (MRDWI) and computed tomography (CT) for hemangioma and venous malformations of head and neck among children. Methods: A total of 55 subjects were systematically recruited into this study, including 25 cases diagnosed with hemangioma and 30 cases with venous malformation. Diagnostic test was applied...

An algorithm is presented for the efficient semi-automatic construction of a detailed reference standard for registration in thoracic CT. A well-distributed set of 100 landmarks is detected fully automatically in one scan of a pair to be registered. Using a custom-designed interface, observers locate corresponding anatomic locations in the second scan. The manual annotations are used to learn t...

In this paper, we will show the feasibility of using ridgeness for rigid automatic matching of CT and MR brain images. Image ridgeness can be computed by convolving the image with derivatives of Gaussians. The speci c derivatives involved are based on the local gradient and second order structure. The width of the used Gaussian determines the locality of the ridgeness computed.

language is a system and every system has rules that govern the structure of its vocabulary. the rules of the arabic language are based on the vowels that consistent with the meanings used in the context represent the words' position. there are some basic rules in addition to vowels which are mostly seen in the written texts. one of these rules is the matching rule that refers to the condi...

We describe a technique of brain surface matching of single-photon emission CT and MR images in human subjects and document the accuracy of this technique with the use of fiduciary markers. This mismatch averaged 4.3 mm as measured by the fiduciary markers and 2.1 mm as measured by the root mean square distance.