Several preprocessing steps are usually needed before the image reconstruction can take place. For instance, the logarithm must be taken of each x-ray measurement. Identify the various types of artifacts that can appear in CT images. Discuss the reasons why these artifacts occur. Describe the methods of avoiding or suppressing. Synonyms: X-ray computed tomography (X-ray CT), computerized axial tomography scan (CAT scan) ICD-10-PCS: B?2: ICD-9-CM: 88.38: MeSH: OPS-301 code: 3–20.3–26 BASICS OF CT & MRI. kindly send me a copy, if possible for me. It is really very helpful to understand CT and MRI medical modalities. Flat field correction in X-ray imaging. In X-ray imaging, the acquired projection images generally suffer from fixed-pattern noise, which is one of the limiting. Metal-related artifacts in instrumented spine. Techniques for reducing artifacts in CT and MRI: state of the art CT artifacts: Causes and reduction techniques Boas and Fleischmann Results. In MRI, 13 out of 44 materials produced artifacts, while in CT 41 out of 44 materials showed artifacts. Artifacts produced in both MRI and CT. Unlike the case of reduction of metal artifacts in conventional CT, PCCT can make use of the three signals (phase-contrast, absorption, dark-field), which are. Hundreds of papyrus rolls, buried by the eruption of Mount Vesuvius in 79 AD and belonging to the only library passed on from Antiquity, were discovered 260 years ago.