Article Figures & Data
Figures
- Fig 1.
Photograph of the system in use (Axiom Artis dBA, Siemens Healthcare Sector) and a diagram of its geometry. RF and RD correspond to the distance from the focal spot to the COR and from the detector to the COR respectively. R(x,y,z) defines the position in the x/y and x/z-plane, and p(u,v), the corresponding attenuation value measured by the respective detector pixel.
- Fig 2.
Diagram of the combination procedure. The first step corresponds to the initial reconstruction; the second step, to the first correction by using 3D LI; and the third step, to the attenuation-normalization correction. The combination procedure reinserts the metal implants into the corrected image. Arrow 1 shows a Guglielmi (Boston Scientific) detachable coil. Arrow 2 indicates metal artifacts and the subsequent reduction of these perturbations.
- Fig 3.
Investigated soft-tissue image (A) and graphs of the results for the differences in CT values (B) and image noise (C).
- Fig 4.
A, D, and G, Uncorrected images. B, E, and H, MAR-corrected images (windows setting of C0/W1000). C, F, and I, Corresponding difference images (narrower windows setting of C0/W500). The difference images apparently contain no other structural information than the metal-induced artifacts.
- Fig 5.
A, D, and G, Sagittal views of patients 2–4. B, E, and H, Uncorrected CT section corresponding to the dashed line. C, F, and I, Corrected CT section. Arrow 1 shows the restored CT values and information between the clips and coils after correction. Arrow 2 indicates the bony structures visible after correction even close to the detechable coil (C0/W1000).
- Fig 6.
Scans of patient 5. A−C, Before coiling, sagittal image (A), transversal image (B), and the corresponding magnified ROI (C). D−F, After coiling, sagittal image (D), uncorrected transversal image (E); and the corresponding magnified ROI (F). G−I, Sagittal corrected image (G), corrected transversal image (H), and the corresponding magnified ROI (I). After MAR is applied, one can recognize the size and configuration of the bleeding in the same way as before the coiling procedure (C0/W250).
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