Metal Artifact Reduction for Orthopedic Implants: Brain CT Angiography in Patients with Intracranial Metallic Implants.
10.3346/jkms.2018.33.e158
- Author:
Leonard SUNWOO
1
;
Sun Won PARK
;
Jung Hyo RHIM
;
Yeonah KANG
;
Young Seob CHUNG
;
Young Je SON
;
Soo Chin KIM
Author Information
1. Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea.
- Publication Type:Original Article
- Keywords:
Aneurysm;
Computed Tomography;
Computed Tomographic Angiography;
Metal Artifact Reduction for Orthopedic Implants;
Image Noise
- MeSH:
Aneurysm;
Angiography*;
Artifacts*;
Brain*;
Humans;
Noise;
Orthopedics*;
Quality Improvement
- From:Journal of Korean Medical Science
2018;33(21):e158-
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND: The purpose of this study was to qualitatively and quantitatively evaluate the effects of a metal artifact reduction for orthopedic implants (O-MAR) for brain computed tomographic angiography (CTA) in patients with aneurysm clips and coils. METHODS: The study included 36 consecutive patients with 47 intracranial metallic implants (42 aneurysm clips, 5 coils) who underwent brain CTA. The computed tomographic images with and without the O-MAR were independently reviewed both quantitatively and qualitatively by two reviewers. For quantitative analysis, image noises near the metallic implants of non-O-MAR and O-MAR images were compared. For qualitative analysis, image quality improvement and the presence of new streak artifacts were assessed. RESULTS: Image noise was significantly reduced near metallic implants (P < 0.01). Improvement of implant-induced streak artifacts was observed in eight objects (17.0%). However, streak artifacts were aggravated in 11 objects (23.4%), and adjacent vessel depiction was worsened in eight objects (17.0%). In addition, new O-MAR-related streak artifacts were observed in 32 objects (68.1%). New streak artifacts were more prevalent in cases with overlapping metallic implants on the same axial plane than in those without (P = 0.018). Qualitative assessment revealed that the overall image quality was not significantly improved in O-MAR images. CONCLUSION: In conclusion, the use of the O-MAR in patients with metallic implants significantly reduces image noise. However, the degree of the streak artifacts and surrounding vessel depiction were not significantly improved on O-MAR images.
