Dual-energy fluoroscopy control and interface system.
Timing diagram of the dual-energy fluoroscopy system.
Bone images acquired with (a) and without (b) dynamic filtration ( silver). Flat panel gain was set to 8. NOC was applied for both images. On the left is the calibration phantom, and on the right are the eight simulated calcified vessels. The arrow indicates the location of the vessel phantom with the minimum CaHA (, areal ).
image (a) and dual-energy bone image (b) acquired with an anthropomorphic chest phantom (60 LAO). The arrow indicates the location of the vessel phantom with of CaHA and areal density of .
Measured CaHA mass plotted with respect to the known mass. The images were acquired over (a) Lucite step phantom, (b) chest phantom with vessels over the rib, and (c) chest phantom with vessels across the edge of the rib. The error bars represent the standard deviation of measurement from ten repeated frames. The lines represent the least-squared fit to the data.
Absolute error plotted with respect to CaHA mass.
Dual-energy bone image acquired (a) without and (b) with misregistration between the low- and high-energy images.
Average error caused by misregistration at different shifts. The error bars represent the RMS error.
The dual-energy CNR as function of patient thickness. The CNR are normalized to that measured at patient thickness of .
The calcification mass measurement precision as a function of patient thickness.
Different combination of x-ray filters used in dual-energy imaging. The filters include the inherent filtration of the x-ray tube ( Al).
The estimation of effective dose conversion coefficient for different dual-energy beams.
Measured CNR and effective dose estimation based on a Lucite step phantom for three different filtration setups with flat panel gains of 8 and software binning.
Tube loading with a Lucite step phantom at a FPD gain of 8 (converted to SID).
Effect of dual-analog gain on image quality. A filtration setup of was used. software binning was applied to the acquired images.
Calcium (CaHA) measurement accuracy with and without anatomic background
Acquisition parameters, patient entrance exposure, detector exposure, and estimated effective dose for one pair of dual energy image for different patient thicknesses (converted to SID).
Article metrics loading...
Full text loading...