Cees van Wijk

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Today's computer aided detection systems for computed tomography colonography (CTC) enable automated detection and segmentation of colorectal polyps. We present a paradigm shift by proposing a method that measures the amount of protrudedness of a candidate object in a scale adaptive fashion. One of the main results is that the performance of the candidate(More)
Over the past years many computer aided diagnosis (CAD) schemes have been presented for the detection of colonic polyps in CT Colonography. The vast majority of these methods (implicitly) model polyps as approximately spherical protrusions. Polyp shape and size varies greatly, however and is often far from spherical. We propose a shape and size invariant(More)
Virtual colonoscopy is a relatively new method for the detection of colonic polyps. Their size, which is measured from reformatted CT images, mainly determines diagnosis. We present an automatic method for measuring the polyp size. The method is based on a robust segmentation method that grows a surface patch over the entire polyp surface starting from a(More)
We present a computer-aided detection (CAD) system for computed tomography colonography that orders the polyps according to clinical relevance. The CAD system consists of two steps: candidate detection and supervised classification. The characteristics of the detection step lead to specific choices for the classification system. The candidates are ordered(More)
Early removal of polyps has proven to decrease the incidence of colon cancer. We aim to increase the sensitivity of the screening by automatic detection of polyps. It requires accurate measurement of the colon wall curvature. This paper describes a new method which computes the curvatures using space-variant derivative operators in a strip along the edge of(More)
Introduction Computed tomographic colonography (CTC) is a modern method for the detection of colorectal polyps. Over the past decade the technique evolved rapidly, stimulated by encouraging performance data. Yet, its future role in cancer screening depends on remaining issues regarding patient compliance and efficiency: • Residual fecal material is well(More)
Over the past few years, techniques for CT colonography evolved rapidly, stimulated by encouraging performance data. Computer aided detection (CAD) methods were developed that enhance the efficiency of reading the data. Our objective in this paper is to review some recent advances on this topic, by others as well by ourselves.
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