Low-Dose and Scatter-Free Cone-Beam CT Imaging Using a Stationary Beam Blocker in a Single Scan: Phantom Studies

Figure 5

Axial views of the reconstructed head phantom. (a) CBCT without scatter correction using FDK algorithm and 655 projections; (b) low–dose cone-beam CT without scatter correction using  ABOCS algorithm and 163 projections (estimated 75% dose reduction); (c) CBCT using the proposed scatter correction and ABOCS reconstruction with 218 projections (estimated 75% dose reduction); (d) fan-beam CT using FDK reconstruction and 655 projections. In the central uniform area (marked with a white circle), the average CT numbers from (a) to (d) are −175, −180, 39, and 49 HU, respectively. Display windows: [−500  900] HU.

(a)

(b)

(c)

(d)