Recognizing and Minimizing Artifacts at CT, MRI, US, and Molecular Imaging
Benjamin L. Triche, John T. Nelson Jr , Noah S. McGill , Kristin K. Porter , Rupan Sanyal , Franklin N. Tessler , Jonathan E. McConathy , David M. Gauntt , Michael V. Yester , Satinder P. Singh
All imaging modalities are subject to spurious findings that may mask normal or abnormal structures and occasionally simulate diseases or conditions, leading to missed or erroneous diagnoses. While it is critical to recognize artifacts, recognition alone is insufficient—radiologists must also understand how they are produced so that they can determine how to eliminate or at least minimize them in practice. For radiology trainees, this knowledge includes understanding the physical principles that underlie medical image production, as well as awareness of the technical assumptions that are applied to image generation.
For all modalities, artifacts may result from patient factors (eg, body habitus) that are beyond the radiologist’s control, scanning parameters, or both. In this online presentation, we illustrate artifacts that are commonly encountered in nonradiographic modalities—CT, MRI, US, and molecular imaging and therapeutics—that are widely employed across a broad range of practices (Figs 1, 2). We describe how artifacts are generated, how to recognize them, and how to mitigate them as images are acquired. Although our presentation is geared toward radiology trainees, it is also suitable as a refresher for radiologists in practice. We assume that the reader has an existing familiarity with basic imaging physics and techniques.
Read Full Article Here: https://doi.org/10.1148/rg.2019180022