Journal of nuclear medicine : official publication, Society of Nuclear Medicine
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To provide optimal image quality, digital filters should account for both the count level and the object imaged. That is, they should be image-dependent. By using the constraint equation of constrained least-squares (CLS) restoration to determine one parameter of the Metz filter, a filter which adapts to the image has been developed. ⋯ The designed filter was tested for its ability to adapt to other objects with images from each of three different test objects. When the values of the Metz filter parameters for these images determined by the CLS-Metz filter were compared by a regression analysis to those which minimized the NMSE for each image, a correlation coefficient of 0.98, a slope of 0.95, and a zero intercept of 0.1 were obtained. With clinical images, the CLS-Metz filter has been shown to provide consistently good image quality with images as diverse as heart perfusion images and bone studies.
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Under ordinary circumstances a toddler's fracture of the lower extremity is diagnosed by clinical evaluation and history. Often the initial conventional radiograph is unrevealing, but the fracture is diagnosed and treated based on appropriate clinical and laboratory findings. ⋯ Skeletal scintigraphy in this small group of patients has been valuable in defining a spiral fracture of the midshaft of the tibia connected with a toddler's fracture. We report the scintigraphic appearance from the findings in six patients with unsuspected toddler's fracture evaluated by this method.