Article Figures & Data
Figures
- Fig 1.
Definition of the C-arm FPCT geometry. A, OV scan with a wide open collimation and a large SFOV covering the complete patient cross-section. B, VOI scan with a narrowed collimation and a small SFOV only covering the region of interest.
- Fig 2.
Measurements of a bar pattern phantom to determine spatial resolution (ρ) and image noise (σ). A−D, Complete images of the phantom (center = 0 HU, width = 1000 HU). E−H, Detailed images of the respective resolution bar pattern (center = 1000 HU, width = 500 HU) for the HD scan (A and E), the OV scan (B and F), the combination of OV and VOI scans (C and G), and the MSCT scan (D and H).
- Fig 3.
Measurements of an inner ear specimen. Complete transversal views (A−D), complete coronal views (E−H), detailed transversal views (I−L), and detailed coronal views (M−P). The first column shows the HD scan; the second column, the OV scan; the third column, the combination of the OV and VOI scans; and the last column, the MSCT scan (center = 0 HU, width = 2000 HU).
- Fig 4.
Monte Carlo dose simulations for the different scanning approaches in transversal (A−D) and coronal views (E−H) for the HD scan (A and E), the OV scan (B and F), the combination of OV and VOI scans (C and G), and the MSCT scan (D and H). All distributions are scaled according to the color scale shown in I.
Tables
Summary of spatial resolution, image noise, and dose values
Scan Spatial Resolution (lp/mm) Image Noise (HU) Dose (mGy) OV 0.6 101 0.2 VOI 2.2 58 1.4 OV + VOI 2.2 58 1.6 HD 2.0 57 14.7 MSCT 1.4 110 8.2
