Clin Radiol 65:868–873ĭavis AJ, Ozsvath J, Vega E, Babb JS, Hagiwara M, George A (2015) Continuous versus sequential acquisition head computed tomography image quality comparative study. The superior motion AI in the HS indicated the effectiveness of HS on moving patients.Ībdeen N, Chakraborty S, Nguyen T, dos Santos MP, Donaldson M, Heddon G, Schwarz BA (2010) Comparison of image quality and lens dose in helical and sequentially acquired head CT.
For both CT systems, the skull base AI did not differ significantly between AS and HS, while the motion AIs of HS were significantly better than of AS. Consequently, the SPFs of AS and HS were nearly identical for both CT systems. For CT-B, the MTFs and NPSs were almost equivalent between the AS and HS, respectively. For CT-A, the 50%MTFs were 7% to 9% higher in the HS than the AS, and the higher MTFs of HS associated NPS increases. The AI of streak artifacts in the skull base was measured using an image obtained of a head phantom, while the AI of motion artifacts was measured from images obtained during the head phantom was in motion. The system performance function (SPF) was calculated as MTF 2/NPS. The modulation transfer function (MTF), noise power spectrum (NPS), and slice sensitivity profile were measured using a CT dose index corresponding to clinical use. Two 64-row multi-detector row CT systems (CT-A and CT-B) were used for comparing AS and HSs with detector rows of 64 and 32. Perhaps an artifact could be differentiated by being a whole, a result or outcome, discrete, a perceivable thing of a definable origin (it was fashioned or produced) - only valued through context an artefact could be differentiated by being a part, a residual, in-discrete, an abstract thing of erroneous origin - only perceived through context.This study aimed to validate the clinically demonstrated equivalency of the axial and helical scan modes (AS and HS, respectively) for head computed tomography (CT) using physical image quality measures and artifact indices (AIs). Perhaps a better distinction between the two words could be achieved through establishing a dichotomy. As such an artefact can become an artifact, where a physical record of this artefactual noise could become a historical artifact. See: wikipedia Discovery of cosmic microwave background radiation. One might also think of things such as cosmic background radiation as being an artifact of the big bang, with the evidence for cosmic background radiation discovered largely from from artefactual noise in radio waves. An artefact that arises from time to time in medical imaging is motion artefact, resulting in image unsharpness or image blur. artificially adding noise to a digital image to test the efficacy of artefact (noise) reduction tools. One method of investigating artefacts in medical imaging is to introduce artificial artefacts i.e. In other words artefactual anomalies can mimic pathological anomalies. I work in medical imaging, where artefact identification and reduction is very important as some image artefacts mimic pathologies. See, where both words are suggested to originate from Latin arte, however the piece claims the direct ancestor of artifice and artificial is Latin artificium, a thing made by skill or art.Īrtifacts are typically objects, stemming from intentional or known factors and/or having historical/social value.Īrtefacts are typically aberrations, resulting from systemic or unknown factors, valueless or of negative value. a malformed product in a factory may be an artifact (object) of an artefact (error) in the manufacturing process. It would seem that artifact pertains more to the physical, whereby something of an artificial nature is something that is able to be created artefact pertains more to the abstract, with something of an artefactual nature being something that is able to be *re*created, though it may manifest in a physical form i.e. I think they are certainly different words, however thanks to the wonders of the English language they have over time come to be homophones which in turn became regional preferences - see.