Patent ID: 8254652

Claim:
A CT image processing apparatus, which is used to detect and display an accurate calculus region from three-dimensional abdominal non-contrast CT images, comprising: an interface unit for obtaining said three-dimensional abdominal non-contrast CT images; a detection region determination unit for determining automatically a kidney region, ureter region, or bladder region, which is used to limit a range of a calculus region, in said three-dimensional abdominal non-contrast CT images in accordance with a preset detection demand; a target region separation unit for separating the calculus region from the three-dimensional abdominal non-contrast CT images in the kidney region, ureter region, or bladder region; a false positive region removing unit for removing false positive regions from said calculus region and obtaining the accurate calculus region; wherein the detection region determination unit determines the kidney region, ureter region, or bladder region by the following manner: establishing a Cartesian coordinate system for the CT images as follows: taking any point as an origin, setting left hand direction of human body as a positive direction of X-axis, setting chest direction as a positive direction of Y-axis, and setting head direction as a positive direction of Z-axis; projecting skeleton separation result in X-axis, Y-axis and Z-axis to obtain all directions projected curves, calculating variance of each point within its neighborhood on the projected curves to obtain variance distribution curves, and determining the detection region by an analysis on characteristics of the variance distribution curves.