1. Improved coronary in-stent visualization using a combined high-resolution kernel and a hybrid iterative reconstruction technique at 256-slice cardiac CT—Pilot study 
Seitaro Oda, Daisuke Utsunomiya, Yoshinori Funama, Hiroko Takaoka, Kazuhiro Katahira, Keiichi Honda, Katsuo Noda, Shuichi Oshima, Yasuyuki Yamashita 
European Journal of Radiology 
Volume 82, Issue 2, Pages (February 2013)
DOI: /j.ejrad
Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

2. Fig. 1
Computed tomography voxel attenuation profiles across the stent for FBP with the CB kernel, FBP with the CD kernel and HIR and the CD kernel using multiplanar reformation images.
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3. Fig. 2
Box plot showing the image noise obtained with 3 reconstruction algorithms. Image noise with FBP and the CD kernel was significantly higher than with FBP and the CB kernel or HIR and the CD kernel. There was no statistically significant difference in image noise between FBP and the CB kernel, and HIR and the CD kernel.
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4. Fig. 3
Box plot showing the image noise with 3 reconstruction algorithms. With FBP and HIR reconstruction, kurtosis was significantly better with the CD- than the CB kernel and blooming artifacts were reduced when the CD kernel was applied. The difference in the kurtosis values obtained with the CD kernel plus FBP- or HIR reconstruction algorithms was not statistically significant.
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5. Fig. 4
Graphs showing the receiver operating characteristics curves of the diagnostic performance of observer 1 (a) and 2 (b) in the detection of in-stent stenosis. The AUC value with FBP and the CB kernel, FBP and the CD kernel, and HIR and the CD kernel was 0.75, 0.73, and 0.92, respectively, for observer 1; it was 0.69, 0.72, and 0.92, respectively, for observer 2. For both observers, the AUC values with HIR and the CD kernel were significantly higher than with FBP and the CB kernel, or FBP and the CD kernel. The difference was not significant when FBP with the CB- or the CD kernel was used.
European Journal of Radiology  , DOI: ( /j.ejrad )
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6. Fig. 5
A patent stent in the middle segment of the right coronary artery in a 77-year-old man. Curved multi-planar reconstruction images obtained with FBP and the CB kernel (a), FBP and the CD kernel (b), and HIR and the CD kernel (c). Blooming artifacts were reduced more when the CD- rather than the CB kernel was applied. Moreover, HIR reduced the image noise due to the CD kernel and improved visualization of the stent lumen.
European Journal of Radiology  , DOI: ( /j.ejrad )
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7. Fig. 6
In-stent restenosis (arrow) in the middle segment of the left anterior descending artery in an 82-year-old man. Curved multi-planar reconstruction images with FBP and the CB kernel (a), FBP and the CD kernel (b), and HIR and the CD kernel (c). Application of HIR with the CD kernel (c) facilitated image noise reduction, improved visualization of the stent lumen due to a reduction in blooming artifacts, and delineated in-stent stenosis more clearly. Conventional coronary angiogram of the left anterior descending artery (d) confirms in-stent restenosis (arrow).
European Journal of Radiology  , DOI: ( /j.ejrad )
Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions