|
KMID : 0191120180330210158
|
|
Journal of Korean Medical Science
2018 Volume.33 No. 21 p.158 ~ p.158
|
|
|
Metal Artifact Reduction for Orthopedic Implants: Brain CT Angiography in Patients with Intracranial Metallic Implants
|
|
Sunwoo Leonard
Park Sun-Won
Rhim Jung-Hyo
Kang Yeon-Ah
Chung Young-Seob
Son Young-Je
Kim Soo-Chin
|
|
|
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.
|
|
|
KEYWORD
|
|
|
Aneurysm, Computed Tomography, Computed Tomographic Angiography, Metal Artifact Reduction for Orthopedic Implants, Image Noise
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
    
|