Identify the artifacts produced on the images during CT scans.describe Essay

Identify the artifacts produced on the images during CT s shtups.describe the method used to reduce or remove these artifacts - seek Exampleion, movement of patients during the scanning process or presence of metals on the body, problems with the scanner or during the reconstructive memory process (Barrett & Keat, 2004). The various types of artifacts and the methods used for reducing their occurrence are discussed below.The most common physics-based artifact is vent curing which is caused due to differential absorption of low and high energy photons of an roentgenogram peter as it passes through an object. Such beam harden phenomena can give rise to cupping and streaking or dark-skinned band artifacts. Cupping artifacts arise when the roentgen rays passing through the middle portion of an object become hard-bitten which causes a reduction in its attenuation rate resulting in an intense beam reaching the detector. Streaking is other common phenomenon where streaks or dark ba nds appear between two dense objects again due to the hardening effect. This is usually visualized in scans taken in bony regions (Barrett & Keat, 2004). The methods used to reduce artifacts due to beam hardening include filtration of low energy particles, calibration correction, and use of appropriate software algorithms to correct the hardening (Barrett & Keat, 2004 Huang, n.d Petit et al, 2010).Presence of a heterogeneous tissue mix can result in a CT number that is an attenuation average of all tissue types which can in turn result in a partial volume artifact as bands or streaks. Presence of off-axis objects in the path of the x-ray beam can result in the appearance of shading artifacts in the scan image. Such artifacts can be avoided using thinner sections and image noise can be limited by cartel thinner sections to form a thicker section (Barrett & Keat, 2004 Huang, n.d).This effect occurs in parts of the body where attenuation of the x-ray beam is greatest such as the shoul ders and the hip. This results in low number of photons reaching the detector which causes clamorous projections that are in turn magnified during the reconstruction