title: Partial ring artifact on cardiac CT: image presentation and clinical implication.
abstract: In computed tomography (CT), the term "artifact" is applied to any systematic discrepancy between the CT numbers in the reconstructed image and the true attenuation coefficients of the object. A partial ring artifact in cardiac CT has a unique pattern and has not been previously reported in real clinical practice. In this report, we will demonstrate the images and animations of a cardiac CT which is affected by a partial ring artifact due to a broken detector module. The different characteristics of ring artifacts on routine and cardiac CT, and the implications for clinical interpretation will also be described. In summary, when a partial ring artifact is noted incidentally on cardiac CT, we suggest interpreting the images by reviewing reconstructed images from different RR-intervals to avoid unnecessary repeated scans and additional radiation exposure.
authors.affiliation: Department of Radiology, Taichung Veterans General Hospital, No. 160, Sec. 3, Taichung Harbor Road, Taichung 407, Taiwan. hsinyu0321@gmail.com
authors.forename: Hsin-Yu
authors.initials: HY
authors.lastname: Tsai
authors.forename: Min-Chi
authors.initials: MC
authors.lastname: Chen
authors.forename: I-Chen
authors.initials: IC
authors.lastname: Tsai
authors.forename: Clayton Chi-Chang
authors.initials: CC
authors.lastname: Chen
mesh_terms: D000368:Aged; D016477:Artifacts; D003287:Contrast Media; D004868:Equipment Failure; D005260:Female; D006331:Heart Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D007472:Iohexol; D011237:Predictive Value of Tests; D014057:Tomography, X-Ray Computed / Q000295:instrumentation
chemical_list: D003287:Contrast Media; D007472:Iohexol