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25 April 1997 Automatic mosaic and display from a sequence of peripheral angiographic images
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We have developed a new algorithm that is capable of combining a sequence of peripheral angiographic images into a long-leg display automatically. In peripheral angiography, the field-of-view of the scanner cannot cover the entire peripheral region in one image. Instead, the peripheral region is divided into subregions and scanner steps to each of the location and acquires images. The adjacent stepping images overlap partially with each other during the image acquisition. Therefore, the problem for reconstructing a long-leg image display is transformed into finding the best image-matching in each adjacent image pair. The new algorithm solves this matching problem by maximizing the 'overlapping ratio' for global matching in each designate image pair. The 'overlapping ratio' is defined as the degree of feature agreement, in the overlapping area calculated from anatomical information of bone and vessels, between two adjacent image pairs. The experimental results indicate that he new approach is robust and generates accurate and reliable image matching. In addition, each leg is fine-tuned to determine the individual matching parameters to compensate the possible leg motion. Based on the matching parameters, we generate long-leg image display in both reduced and full resolutions so that cross reference of region-of-interest can be done interactively.
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Jin-Shin Chou, JianZhong Qian, Zhenyu Wu, and Helmut F. Schramm "Automatic mosaic and display from a sequence of peripheral angiographic images", Proc. SPIE 3034, Medical Imaging 1997: Image Processing, (25 April 1997);

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