Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
188 words
A computerized tomography apparatus for reconstructing a cross-sectional image of an object characterized in that source means (31) for directing a fan-beam of radiation passing through the object; detector means (32) having a plurality of elements for detecting the radiation through the object along a plurality of paths and for providing corresponding output signals representative of radiation intensity integrated along each of said paths; scanning means (33) for effecting relative rotation of said source means and said detector means and for obtaining projection data from said output signals at different viewpoints with respect to said object; transfer means (34) for transferring said projection data as a train of said projection data according to said relative rotation of said source means and said detector means, said train including a sub-train of two successive identical projection data in it; generating means (35) for adding the projection data in said train and later transferred projection data in said train and for generating the estimated projection data including an interpolated one between said views; and image reconstruction means (36) for forming a reconstructed image of the object from said estimated projection data.
Claim 2
Dependent Claim
188 words
A computerized tomography apparatus for reconstructing a cross-sectional image of an object characterized in that source means (31) for directing a fan-beam of radiation passing through the object; detector means (32) having a plurality of elements for detecting the radiation through the object along a plurality of paths and for providing corresponding output signals representative of radiation intensity integrated along each of said paths; scanning means (33) for effecting relative rotation of said source means and said detector means and for obtaining projection data from said output signals at different viewpoints with respect to said object; transfer means (34) for transferring said projection data as a train of said projection data according to said relative rotation of said source means and said detector means, said train including a sub-train of two successive identical projection data in it; generating means (35) for adding the projection data in said train and later transferred projection data in said train and for generating the estimated projection data including an interpolated one between said views; and image reconstruction means (36) for forming a reconstructed image of the object from said estimated projection data.
Claim 3
Dependent Claim
27 words
A computerized tomography apparatus according to claim 1, characterized in that said projection data are obtained without reordering said fan-beam paths into a different set of paths.
Claim 4
Dependent Claim
14 words
A computerized tomography apparatus according to claim 1, characterized in that said detector means
Claim 5
Dependent Claim
27 words
(32) is stationary and said projection data are obtained with reordering said fan-beam paths into detector fan-beam path spaced angularly for one element of the detector means.
Claim 6
Dependent Claim
27 words
(32) is stationary and said projection data are obtained with reordering said fan-beam paths into detector fan-beam path spaced angularly for one element of the detector means.
Claim 7
Dependent Claim
198 words
An apparatus according to claim 1, characterized in that said transfer means (34) transfers an "i"th projection data twice and (i + l)th and (i + 2)th projection data one (where i is any natural number), and thereafter repeatedly transfers a projection data group having three consecutive projection data; and said generating means (36) adds a multiplied result obtained by multiplying the "i"th projection data in a first transfer by 1/2 and a multiplied result obtained by multiplying the "i"th projection data in a second transfer by 1/2, a multiplied result obtained by multiplying the "i"th projection data in the second transfer by 1/4 and a multiplied result obtained by multiplying the (i + l)th projection data in a third transfer by 3/4, a multiplied result obtained by multiplying the (i + l)th projection data in the third transfer by 2/4 and a multiplied result obtained by multiplying the (i + 2)th projection data in a fourth transfer by 2/4, and a multiplied result obtained by multiplying the (i + 2)th projection data in the fourth transfer by 3/4 and a multiplied result obtained by multiplying an (i + 3)th projection data in a fifth transfer by 1/4.
Claim 8
Dependent Claim
109 words
An apparatus according to claim 2, characterized in that said generating means (36) comprises: an input memory for storing each of the projection data transferred from said transfer means; a buffer memory for reading out and storing each of the projection data stored in said input memory at high speed; a multiplier for multiplying each of the projection data stored in said buffer memory by 1/2; an interpolating memory for storing a multiplied result; and an adder for adding the multiplied result stored in said interpolating memory and corresponding to each of the projection data and a multiplied result corresponding to the next projection data obtained by said multiplier.
Claim 9
Dependent Claim
142 words
An apparatus according to claim 4, characterized in that said generating means (36) comprises: an input memory for storing each of the projection data transferred from said transfer means; a first buffer memory for reading out and storing each of the projection data stored in said input memory; a first multiplier for reading out each of the projection data stored in said first buffer memory and multiplying each of the projection data by a predetermined multiplicator; a second buffer memory for reading out and storing the next projection data transferred next to the projection data stored in said first buffer memory; a second multiplier for reading out the projection data stored in said second buffer memory and for multiplying the projection data read out thereby a predetermined multiplicator; and an adder for adding multiplied results obtained by said first and second multipliers.
Claim 10
Independent Claim
136 words
A method of reconstructing a cross-sectional image of an object characterized by comprising the steps of; directing a fan-beam of radiation through said object; measuring the radiation through said object by means of a plurality of detectors lying within a plane of said fan-beam and situated opposite to said radiation source; causing relative motion between said source and said object within said plane in such a way that said detectors always remain opposite said source; obtaining projection data from said detectors at different viewpoints with respect to said object; partially transferring said projection data twice in accordance with said relative motion; adding said projection data and the next transferred one for producing the estimated projection data including the interpolated one between said views; and reconstructing said estimated projection data into a cross-sectional image of said object.
Claim 11
Independent Claim
136 words
A method of reconstructing a cross-sectional image of an object characterized by comprising the steps of; directing a fan-beam of radiation through said object; measuring the radiation through said object by means of a plurality of detectors lying within a plane of said fan-beam and situated opposite to said radiation source; causing relative motion between said source and said object within said plane in such a way that said detectors always remain opposite said source; obtaining projection data from said detectors at different viewpoints with respect to said object; partially transferring said projection data twice in accordance with said relative motion; adding said projection data and the next transferred one for producing the estimated projection data including the interpolated one between said views; and reconstructing said estimated projection data into a cross-sectional image of said object.