Korean J Radiol.  2017 Oct;18(5):860-866. 10.3348/kjr.2017.18.5.860.

Combined Electrocardiography- and Respiratory-Triggered CT of the Lung to Reduce Respiratory Misregistration Artifacts between Imaging Slabs in Free-Breathing Children: Initial Experience

Affiliations
  • 1Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea. hwgoo@amc.seoul.kr
  • 2Siemens Healthcare, GmbH, Computed Tomography Division, Forchheim 91301, Germany.

Abstract


OBJECTIVE
Cardiac and respiratory motion artifacts degrade the image quality of lung CT in free-breathing children. The aim of this study was to evaluate the effect of combined electrocardiography (ECG) and respiratory triggering on respiratory misregistration artifacts on lung CT in free-breathing children.
MATERIALS AND METHODS
In total, 15 children (median age 19 months, range 6 months-8 years; 7 boys), who underwent free-breathing ECG-triggered lung CT with and without respiratory-triggering were included. A pressure-sensing belt of a respiratory gating system was used to obtain the respiratory signal. The degree of respiratory misregistration artifacts between imaging slabs was graded on a 4-point scale (1, excellent image quality) on coronal and sagittal images and compared between ECG-triggered lung CT studies with and without respiratory triggering. A p value < 0.05 was considered significant.
RESULTS
Lung CT with combined ECG and respiratory triggering showed significantly less respiratory misregistration artifacts than lung CT with ECG triggering only (1.1 ± 0.4 vs. 2.2 ± 1.0, p = 0.003).
CONCLUSION
Additional respiratory-triggering reduces respiratory misregistration artifacts on ECG-triggered lung CT in free-breathing children.

Keyword

Lung CT; ECG triggering; Respiratory triggering; Children; Motion artifacts

MeSH Terms

*Artifacts
Child
Child, Preschool
*Electrocardiography
Female
Humans
Image Enhancement
Infant
Lung/*diagnostic imaging
Male
Respiration
*Tomography, X-Ray Computed
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