Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
A computerized tomographic apparatus comprising: scanning means for moving an object in one direction and for rotating radiation rays within a plane intersecting a moving direction of said object to perform helical scan on said object, thereby to provide projection data, characterized by further comprising: interpolation means (13) for interpolating a projection data of a predetermined slice and having a given projection angle in accordance with two projection data of two slices located on both sides of the predetermined slice and having the given projection angle and a distances between the two slices and the predetermined slice.
Claim 2
Dependent Claim
97 words
A computerized tomographic apparatus comprising: scanning means for moving an object in one direction and for rotating radiation rays within a plane intersecting a moving direction of said object to perform helical scan on said object, thereby to provide projection data, characterized by further comprising: interpolation means (13) for interpolating a projection data of a predetermined slice and having a given projection angle in accordance with two projection data of two slices located on both sides of the predetermined slice and having the given projection angle and a distances between the two slices and the predetermined slice.
Claim 3
Dependent Claim
142 words
An apparatus according to claim 1, characterized in that said interpolation means (13) interpolates the projection data P C (φ, ϑ) of the predetermined slice and having a projection angle φ in accordance with the two projection data P A (φ, ϑ) and P B (φ, ϑ) of the two slices and having the projection angle φ as follows, P C (φ, ϑ) = α·P A (φ, ϑ) + (1 -α)·P B (φ, ϑ) where α is an interpolation ratio and is expressed as follows, α = (X C - X B ) / (X A - X B ) where X A - X B and X C - X B are a distance between the two slices and a distance between the predetermined slice and one of the two slices which corresponds to the projection data P B (φ, ϑ).
Claim 4
Dependent Claim
167 words
An apparatus according to claim 1, characterized in that said interpolation means (13) comprises: means for calculating projection data P′ B (φ, ϑ) of a first slice and having a projection angle φ from counter beams; and means for interpolating the projection data P C (φ, ϑ) of the predetermined slice and having the projection angle φ in accordance with a projection data P A (φ, ϑ) of a second slice and having the projection angle φ and the projection data P′ B (φ, ϑ) of the first slice as follows, P C (φ, ϑ) = α′·P A (φ, ϑ) + (1 - α′)·P′ B (φ, ϑ) where α′ is an interpolation ratio and is expressed as follows, α′ = (X C - X′ B ) / (X A - X′ B ) where X A - X′ B and X C - X′ B are a distance between the first slice and the second slice and a distance between the predetermined slice and the first slice.
Claim 5
Dependent Claim
34 words
An apparatus according to claim 1, characterized by further comprising: image reconstruction means (15) for processing an output of said interpolation means; and means (19) for displaying an output of said image reconstruction means.
Claim 6
Independent Claim
115 words
A method for providing a slice image of an object, comprising the steps of: moving said object in one direction while rotating radiation rays within a plane intersecting a moving direction of said object, to perform helical scan on said object, thereby providing helical scan data; designating a desired slice of said object; reconstructing an image of the desired slice based on the projection data, characterized by further comprising the step of: interpolating a projection data at the desired slice and having a given projection angle in accordance with two helical scan data at two slices located on both sides of the desired slice and a distance between said two slices and the desired slice.
Claim 7
Independent Claim
115 words
A method for providing a slice image of an object, comprising the steps of: moving said object in one direction while rotating radiation rays within a plane intersecting a moving direction of said object, to perform helical scan on said object, thereby providing helical scan data; designating a desired slice of said object; reconstructing an image of the desired slice based on the projection data, characterized by further comprising the step of: interpolating a projection data at the desired slice and having a given projection angle in accordance with two helical scan data at two slices located on both sides of the desired slice and a distance between said two slices and the desired slice.