Article Figures & Data
Figures
- Fig 1.
Measurement (A) and dosimetry setup (B) including the C-arm system and the PMMA phantom in which the ionization chamber was placed. The PMMA phantom possessed 5 bore-holes for dosimeter placement in the central and peripheral regions.
- Fig 2.
Geometry definitions for the y/z plane COR is the center of rotation, Cz is the beam width at the COR (ie, collimation), and γ is the cone angle. RF is the distance from the focal spot to the COR, and RD is the distance from the detector to the COR.
- Fig 3.
CTDI values for center, periphery, and the calculated CTDIw. The solid line represents a quadratic fit for the CTDIw which was used for subsequent calculations. The correlation coefficient amounted to R = 0.98.
- Fig 4.
Dose values for 172 patient scans regarding the high-speed (HS) protocol. A, B, and C show the histogram of the number of patient scans regarding the CTDIw, DLP, and DAP. The distributions are similar for the 3 dose measurement techniques. The DAP measured on-line shows a good linear correlation to the estimated CTDIw value (D). Note: The red lines and red dotted lines indicate the mean value and SD.
- Fig 5.
Dose values for 45 patient scans with use of the high-quality protocol. A, B, and C show the histogram of patient scans with respect to the CTDI, DLP, and DAP. The distributions are similar for the 3 dose measurement techniques. The DAP measured on-line shows a good linear correlation to the estimated CTDIw value (D). Note: The red lines and red dotted lines indicate the mean value and SD.
- Fig 6.
Qualitative comparison of an HS reconstruction (left side) and HQ (right side) for the same patient and section with respect to diagnostic image quality. Because of the superior image quality, the subarachnoid bleeding can be clearly diagnosed on the HQ image. The HS image seems to be only adequate for a rough anatomic orientation.
- Fig 7.
Mechanical thrombolysis of a carotid-T-occlusion. The reperfusion resulted in enhancement of contrast agent in the basal ganglia, which was injected during mechanical recanalization. High-quality scan (left side) was performed to exclude hemorrhage. This finding was confirmed on follow-up cCT, which was performed the next day (right side).
- Fig 8.
Example of 3D dose distributions calculated by Monte Carlo simulations for 2 phantom planes (axial and coronal) with use of an anthropomorphic phantom for a 200° C-arm FPCT scan in relative units representing head and pelvis scans. The axial section nicely demonstrates the inhomogeneity of the dose distribution for a partial scan.
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