Utility of second-generation single-energy metal artifact reduction in helical lung computed tomography for patients with pulmonary arteriovenous malformation after coil embolization
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The quality of images acquired using single-energy metal artifact reduction (SEMAR) on helical lung computed tomography (CT) in patients with pulmonary arteriovenous malformation (PAVM) after coil embolization was retrospectively evaluated.
Materials and methods
CT images were reconstructed with and without SEMAR. Twenty-seven lesions [20 patients (2 males, 18 females), mean age 61.2 ± 11.0 years; number of embolization coils, 9.8 ± 5.0] on contrast-enhanced CT and 18 lesions of non-enhanced lung CT concurrently performed were evaluated. Regions of interest were positioned around the coils and mean standard deviation value was compared as noise index. Two radiologists visually evaluated metallic coil artifacts using a four-point scale: 4 = minimal; 3 = mild; 2 = strong; 1 = extensive.
Noise index was significantly improved with SEMAR versus without SEMAR (median [interquartile range]; 194.4 [161.6–211.9] Hounsfield units [HU] vs. 243.9 [220.4–286.0] HU; p < 0.001). Visual score was significantly improved with SEMAR versus without SEMAR (Reader 1, 3  vs.1 ; Reader 2, 3  vs.1 ; p < 0.001). Significant differences were similarly demonstrated on lung CT (p < 0.001).
SEMAR provided clear chest CT images in patients who underwent PAVM coil embolization.
KeywordsArtifact reduction Metal implants CT Pulmonary arteriovenous malformation Single-energy metal artifact reduction algorithm
Compliance with ethical standards
Conflict of interest
The authors declare no conflicts of interest or funding sources to disclose.
This study was approved by the ethics committee of the authors’ institution, and requirements for informed consent were waived. Information from this study was presented on the institutional website, and all patients were informed of their right to opt out.
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