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Head CT: Image quality improvement with ASIR-V using a reduced radiation dose protocol for children

 Hyun Gi Kim  ;  Ho-Joon Lee  ;  Seung-Koo Lee  ;  Hyun Ji Kim  ;  Myung-Joon Kim 
 EUROPEAN RADIOLOGY, Vol.27(9) : 3609-3617, 2017 
Journal Title
Issue Date
Adolescent ; Brain/diagnostic imaging* ; Child ; Child, Preschool ; Clinical Protocols ; Female ; Humans ; Male ; Phantoms, Imaging ; Quality Improvement ; Radiation Dosage ; Radiographic Image Interpretation, Computer- ; Assisted/methods ; Reproducibility of Results ; Retrospective Studies ; Tomography, X-Ray Computed/methods* ; Tomography, X-Ray Computed/standards
Brain ; Computer-assisted methods ; Pediatric ; Radiation dosage ; Radiation protection methods
OBJECTIVE: To investigate the quality of images reconstructed with adaptive statistical iterative reconstruction V (ASIR-V), using pediatric head CT protocols.

METHODS: A phantom was scanned at decreasing 20% mA intervals using our standard pediatric head CT protocols. Each study was then reconstructed at 10% ASIR-V intervals. After the phantom study, we reduced mA by 10% in the protocol for <3-year-old patients and applied 30% ASIR-V and by 30% in the protocol for 3- to 15-year-old patients and applied 40% ASIR-V.

RESULTS: Increasing the percentage of ASIR-V resulted in lower noise and higher contrast-to-noise ratio (CNR) and preserved spatial resolution in the phantom study. Compared to a conventional-protocol, reduced-dose protocol with ASIR-V achieved 12.8% to 34.0% of dose reduction and showed images of lower noise (9.22 vs. 10.73, P = 0.043) and higher CNR in different levels (centrum semiovale, 2.14 vs. 1.52, P = 0.003; basal ganglia, 1.46 vs. 1.07, P = 0.001; and cerebellum, 2.18 vs. 1.33, P < 0.001). Qualitative analysis showed higher gray-white matter differentiation and sharpness and preserved overall diagnostic quality in the images with ASIR-V.

CONCLUSIONS: Use of ASIR-V allowed a 12.8% to 34.0% dose reduction in each age group with potential to improve image quality.

KEY POINTS: • It is possible to reduce radiation dose and improve image quality with ASIR-V. • We improved noise and CNR and decreased radiation dose. • Sharpness improved with ASIR-V. • Total radiation dose was decreased by 12.8% to 34.0%.
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1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Myung Joon(김명준) ORCID logo https://orcid.org/0000-0002-4608-0275
Lee, Seung Koo(이승구) ORCID logo https://orcid.org/0000-0001-5646-4072
Lee, Ho Joon(이호준)
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