In ultrasound imaging, several assumptions are made from the computer system to interpret the returning echoes. Physicians typically learn to recognize some of these artifacts to avoid mistaking them for actual pathology. These artifacts may be caused by a variety of phenomena such as the underlying physics of the energy-tissue interaction as between ultrasound and air, susceptibility artifacts, data acquisition errors (such as patient motion), or a reconstruction algorithm's inability to represent the anatomy. In medical imaging, artifacts are misrepresentations of tissue structures produced by imaging techniques such as ultrasound, X-ray, CT scan, and magnetic resonance imaging (MRI). This prediction is a statistical artifact, since it is spurious to use the model when the percentage of citizens making over $50,000 is so high, and gross error to predict an approval rating greater than 100%. For instance, imagine a hypothetical finding that presidential approval rating is approximately equal to twice the percentage of citizens making more than $50,000 annually if 60% of citizens make more than $50,000 annually, this would predict that the approval rating will be 120%. Such an artifact may be called a statistical artifact. In econometrics, which trades on computing relationships between related variables, an artifact is a spurious finding, such as one based on either a faulty choice of variables or an over-extension of the computed relationship. In microscopy, visual artifacts are sometimes introduced during the processing of samples into slide form. In computer science, digital artifacts are anomalies introduced into digital signals as a result of digital signal processing. In natural science and signal processing, an artifact or artefact is any error in the perception or representation of any information introduced by the involved equipment or technique(s). Articles via Databases - Look for electronic resources containing information on material culture and images of objects in databases arranged by subject.Diffraction spikes and the Airy disk are optical artifacts caused by the diffraction of light through the aperture of an optical system.Mellon Foundation, with a mission to use digital technology to enhance scholarship, teaching and learning in the arts and associated fields. ARTstor is a non-profit initiative, founded by The Andrew W. ARTstor - Search one million images in the arts, architecture, humanities, and social sciences and use a suite of software tools to view, present, and manage images for research and pedagogical purposes.American Broadsides and Ephemera - Broadsides printed between 18 and ephemera printed between 17.Use the finding aids search to find archival collections containing artifacts by searching on the general terms "ephemera," "artifacts," or use more specific terms such as "buttons" or "advertisements." They can include a wide variety of ephemera and objects. Search Finding AidsĪrchival collections frequently contain more than just paper. This highly informative research guide will help you find information on fine and decorative arts. This guide is intended for the researcher who needs to locate visual materials- from reproductions of artworks to photographic images of just about anything imaginable.
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