Diagram for cone beam breast CT with VOI scanning technique.
Illustration of the VOI technique and corresponding x-ray signal intensities.
A stationary gantry, rotating phantom cone beam CT system with a VOI mask.
Mean signal value versus noise variance. The cross and solid line represent the measured data and fitted curve, respectively.
Front (a) and side (c) views of full-field cone beam CT images of a breast specimen obtained at . Front (b) and side (d) views of VOI cone beam CT images of the breast specimen with a rectangular opening.
Full-field cone beam CT image (a, c) and VOI cone beam CT image (b, d) of a gelatin phantom inserted with two groups of calcifications (size ) in the center and at the edge.
Comparison of CT number profiles of the VOI image and full-field cone beam CT image.
Dose versus distance from the rotating axis. The vertical dashed line indicates the boundary of the VOI.
Primary and scattered x-ray intensity profiles for the full-field and VOI projection images in the horizontal direction.
Full-field cone beam CT image (a) and VOI cone beam CT image (b) of a low contrast phantom. The CNRs inside the VOI are 0.88 and 1.28, respectively.
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