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Several strategies have been developed to prevent artifacts. In this article, different artifacts in CT imaging and various techniques to prevent then will be elaborated.
Different researchers have classified artifacts in different manner. While some experts have classified artifacts based on appearance, like ring artifacts, shading artifacts and streak artifacts (Goldman, 2007, 222), others have classified them based on the causes (Yazdi and Beaulieu, 2008, 135). In this articles, classification by Yazdi and Beaulieu (2008, 135) will be used.
Patient-based artifacts occur because of some attributes in the body of the patients. The most common patient-based artifacts are metallic artifacts. These artifacts occur due to presence of irremovable metals in the body of the patient like hip prosthesis, dental filling, fracture fixation rods, cardiac prosthesis, chemotherapy ports and surgical clips. Metallic artifacts appear like streaks on images. They occur because of improper and inaccurate correction of beam hardening within the back projection that is filtered. As such, metals absorb photons heavily and cause overestimation of activity in the metallic region. This is the reason why patients are asked to remove all metallic objects in their body prior to entering the scan room. Several techniques have been developed to prevent on minimize metallic artifacts in CT images (Yazdi and Beaulieu, 2008, 136). One such strategy is to disregard data related to projections from metal objects and reconstruct image only based on projection data from non-corrupted regions. However, this method is very costly for regular scans and convergence problems occur frequently. Another strategy is to reconstruct images by manually identifying the missing projections and replacing them with non-missing projections of the surrounding areas. This method is known as projection-interpolation method. Other strategies to
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Cultural artifacts are a vital part of humanities deep rooted in anthropology, ethnology and sociology. It comprises of the things created by human beings who enlighten us about the culture of the creator and the user. It encompasses all spheres of life including arts and literature, architecture, laws, religion even economics and way of living.
The principal researchers of this research were The article was published Dr. Henschke and Dr. Yankelevitz. The financing was revealed by chance during review of tax records. Research pertaining to lung cancer cannot be funded by tobacco company because of potential bias.
CT imaging is more prone for artifacts when compared to conventional radiography because "the image is reconstructed from something on the order of a million independent detector measurements. The reconstruction
Presence of an artifact compromises the quality of the image generated from the scan, thus making it difficult to use the image as a diagnostic tool (Barrett & Keat, 2004). There are several ways by which artifacts originate which include processes involving CT data
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Hitler blames the poor state of the country and his failure to join the Vienna Art Academy on the Jews and other immigrants. He is frustrated watching Germany fall apart during the World War I and vows
When we were in high school, different students stood out for different reasons. Such reasons defined their identities and made them be known. Some were had exemplary performance in class work, some in games, other in public communication and other were also good in other extracurricular activities.
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