Patent US207349A successfully refreshed from Google Patents.
Patent EP0113879A2 successfully refreshed from Google Patents.
EP0113879A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Computerized tomographic apparatus utilizing a radiation source
Assignee: Toshiba Corp
•
Filing: 1983-12-13
•
Granted: —
•
Expires: 2003-12-13
Abstract
Abstract In a computerized tomographic apparatus (100), X-rays penetrated from an imaginary slice of an object (M) are computer-processed so as to reconstruct a tomographic image of the slice of the object. The CT apparatus (100) is comprised of a table couch (12) for supporting the object (M) to be examined, a table couch drive control circuit (18) for controlling a continuous transportation of the table couch (12) along a longitudinal axis of the object (M), an X-ray source (13) for irradiating fan-shaped X-rays toward the slice of the object (M), a detector array (14) for detecting the fan-shaped X-rays which have penetrated through the slice of the object (M), a gantry (10) for mounting the X-ray source (13) and the detector array (14) in such a manner that the X-ray source (13) is positioned opposite from the detector array (14) with respect to the slice of the obejct (M) and for performing a relative movement between the X-ray source (13) and the detector array (14) in a plane which is perpendicular to the longitudinal axis of the object (M), whereby a helical scanning is effected by the continuous transportation of the table couch (12) and the relative movement between them, and a reconstruction control circuit (21) for processing helically-scanned projection signals derived from the detector array (14) so as to reconstruct a tomographic image of the slice of the object (M).
Inventors
- 👤 Issei Mori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 10:24
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032; A61B6/027; A61B6/04; A61B6/0487; Y; Y10; Y10S; Y10S378/00; Y10S378/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
231 words
A computerized tomographic apparatus (100) in which radiation rays penetrated from an imaginary slice of an object (M) are computer-processed so as to reconstruct a tomographic image of the slice of the object (M), characterized by comprising: table couch means (12) for supporting the object (M) to be examined; a table couch drive control circuit (18) for controlling a continuous transportation of the table couch means (12) along a longitudinal axis of the object (M); a radiation source (13) for irradiating fan-shaped radiation rays toward the slice of the object (M); means (14) for detecting the fan-shaped radiation rays which have penetrated through the slice of the object (M); means (10) for mounting the radiation source (13) and the detection means (14) in such a manner that the radiation source (13) is positioned opposite from the detection means (14) with respect to the slice of the object (M) and for performing a relative movement between the radiation source (13) and the detection means (14) in a plane which is perpendicular to the longitudinal axis of the object (M), whereby a helical scanning is effected by the continuous transportation of the table couch means (12) and the relative movement between them; and a reconstruction control circuit (21) for processing helically-scanned projection signals derived from the detection means (14) so as to reconstruct a tomographic image of the slice of the object (M).
Claim 2
Dependent Claim
231 words
A computerized tomographic apparatus (100) in which radiation rays penetrated from an imaginary slice of an object (M) are computer-processed so as to reconstruct a tomographic image of the slice of the object (M), characterized by comprising: table couch means (12) for supporting the object (M) to be examined; a table couch drive control circuit (18) for controlling a continuous transportation of the table couch means (12) along a longitudinal axis of the object (M); a radiation source (13) for irradiating fan-shaped radiation rays toward the slice of the object (M); means (14) for detecting the fan-shaped radiation rays which have penetrated through the slice of the object (M); means (10) for mounting the radiation source (13) and the detection means (14) in such a manner that the radiation source (13) is positioned opposite from the detection means (14) with respect to the slice of the object (M) and for performing a relative movement between the radiation source (13) and the detection means (14) in a plane which is perpendicular to the longitudinal axis of the object (M), whereby a helical scanning is effected by the continuous transportation of the table couch means (12) and the relative movement between them; and a reconstruction control circuit (21) for processing helically-scanned projection signals derived from the detection means (14) so as to reconstruct a tomographic image of the slice of the object (M).
Claim 3
Dependent Claim
50 words
An apparatus (100) as claimed in Claim 1, characterized in that the reconstruction control circuit (21) performs in such a manner that at least two helically-scanned projection signals which are succeedingly detected during the examination are averaged so as to obtain one tomographic image of the slice of the object.
Claim 4
Dependent Claim
58 words
An apparatus (100) as claimed in Claim 1, characterized in that the reconstruction control circuit (21) performs in such a manner that at least two helically-scanned projection signals which are succeedingly detected during the examination are processed to reconstruct two tomographic images and thereafter averaged so as to obtain one tomographic image of the slice of the object.
Claim 5
Dependent Claim
104 words
An apparatus (100) as claimed in Claim 1, characterized in that it further comprises: a system control circuit (23) which is coupled to control the table couch drive control circuit (18) and the radiation source (13) in such a manner that a plurality of the helically-scanned projection signals is detected in the detection means (14) by controlling the continuous transportation of the object (M) with respect to the relative movement between the radiation source (13) and the detector means (14) so as to scan the object (M) at a predetermined smaller scanning pitch than an effective width of the slice of the object (M).
Claim 6
Dependent Claim
103 words
An apparatus as claimed in Claim 1, characterized in that it further comprises: a data correction circuit (20) which is interposed between the detection means (14) and the reconstruction control circuit (21) so as to correct the helically-scanned projection signals derived from the detection means (14) in such a manner that at least one helically-scanned projection signal is obtained for one slice of the object (M) and the adjoining slice thereof respectively, and a signal portion of the helically-scanned projection signal of one slice at a predetermined projection angle is corrected based upon that of the adjoining slice at the same projection angle.
Claim 7
Dependent Claim
234 words
A computerized tomographic apparatus (100): in which a plurality of X-rays penetrated from an imaginary slice of an object (M) are computer-processed so as to reconstruct a tomographic image of the slice of the object (M), characterized by comprising: table couch means (12) for supporting the object (M) to be examined; a table couch drive control circuit (18) for controlling a continuous transportation of the table couch means (12) along a longitudinal axis of the object (M); a plurality of X-ray sources for irradiating fan-shaped radiation rays toward the slice of the object (M); means (14) for detecting said plurality of the fan-shaped radiation rays which have penetrated through the slice of the object (M); means (10) for mounting the X-ray sources and the detection means (14) in such a manner that the X-ray sources are positioned opposite from the detection means (14) with respect to the slice of the object (M) and for performing a relative movement between the X-ray sources and the detection means (14) in a plane which is perpendicular to the longitudinal axis of the object (M), whereby a helical scanning is effected by the continuous transportation of the table couch means (12) and the relative movement between them; and a reconstruction control circuit (21) for processing helically-scanned projection signals derived from the detection means (14) so as to reconstruct a tomographic image of the slice of the object (M).
Claim 8
Dependent Claim
234 words
A computerized tomographic apparatus (100): in which a plurality of X-rays penetrated from an imaginary slice of an object (M) are computer-processed so as to reconstruct a tomographic image of the slice of the object (M), characterized by comprising: table couch means (12) for supporting the object (M) to be examined; a table couch drive control circuit (18) for controlling a continuous transportation of the table couch means (12) along a longitudinal axis of the object (M); a plurality of X-ray sources for irradiating fan-shaped radiation rays toward the slice of the object (M); means (14) for detecting said plurality of the fan-shaped radiation rays which have penetrated through the slice of the object (M); means (10) for mounting the X-ray sources and the detection means (14) in such a manner that the X-ray sources are positioned opposite from the detection means (14) with respect to the slice of the object (M) and for performing a relative movement between the X-ray sources and the detection means (14) in a plane which is perpendicular to the longitudinal axis of the object (M), whereby a helical scanning is effected by the continuous transportation of the table couch means (12) and the relative movement between them; and a reconstruction control circuit (21) for processing helically-scanned projection signals derived from the detection means (14) so as to reconstruct a tomographic image of the slice of the object (M).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.