X-ray television diagnostic apparatus

Claim 2

An X-ray television diagnostic apparatus (100) characterized by comprising: a source (1, 15) for generating a pulsatory X-ray; image intensifying means (3) which receives an X-ray transmission image of an object (2) under investigation that is produced by a penetration of the pulsatory X-ray through the object (2), and which produces an optical image of the object (2); television camera means (5); an optical system (4) optically-coupled between the image intensifying means (3) and the television camera means (5) which transfers the optical image from the image intensifying means (3) to the television camera means (5); light interrupting means (4g; 20) provided in at least one of the image intensifying means and the optical system so as to interrupt the transfer of the optical image to the television camera means; A/D converting means (7) for converting an analogue image signal that is derived from the television camera means (5) into a corresponding digital image signal; storage means which includes at-least first and second frame memories (9; 10), and stores the digital image signal from the A/D converting means (7); algorithmic means (8) which performs given image processing for at least two sets of the digital image signals that are previously stored in the first and second frame memories (9; 10) respectively so as to derive an image-processed digital signal; D/A converting means (11) for converting the image-processed digital signal into a corresponding image-processed analogue signal; monitor means (12) for displaying the image-processed analogue signal from the D/A converting means (11); pulse generating means (17) for generating pulse signals that are adapted to the television camera (5) means as field sync pulse signals; camera control means (6) for controlling at least scanning of the optical image which is incident upon the television camera means (5); optical blanking control means (18) for controlling the blanking timing operation of the light interrupting means (4g); X-ray control means (14) for controlling a projection of the pulsatory X-ray from the pulsatory X-ray generating source (1; 15); and system control means (13) which performs controls of the apparatus (100) in such a manner that the projection of the pulsatory X-ray toward the object (2) commences in synchronized with the field sync pulse signal under the control of the X-ray control means (14), the blanking operation of the light interrupting means (4g) is interrupted and the scanning operation of the television camera means (5) is blanked out under the control of the optical blanking control means (18) and the camera control means (6) respectively while the projection of the pulsatory X-ray is continued, and at least the blanking operation of the light interrupting means (4g) commences immediately after the projection of the pulsatory X-ray is accomplished.

Claim 3

An apparatus (100) as claimed in claim 1, characterized in that the light interrupting means is a grid control circuit (20) connected to the optical blanking control means (18), and the optical blanking control means (18) further controls the image intensifying means (3) in such a manner that immediately after the projection of the pulsatory X-ray is accomplished, the blanking operation of the grid control circuit (18) commences.

Claim 4

An apparatus (100) as claimed in claim 1, characterized by further comprising; injector means (16) for administrating an X-ray contrast medium into the object (2), injection of the X-ray contrast meduim being controlled by the system control means (13) in synchorized with the field sync pulse signals.

Claim 5

An apparatus (100) as claimed in claim 1, characterized in that given image processing of the algorithmic means (8) is a digital time subtraction for at least two sets of the digital image signals.

Claim 6

An apparatus (100) as claimed in claim 1, characterized in that given image processing of the algorithmic means (8) is digital filtering process for at least two sets of the digital image signals.

Claim 7

An X-ray television diagnostic apparatus (200) characterized by comprising; a first source (lL) for generating a first pulsatory X-ray; first image intensifying means (3L) which receives a first X-ray transmission image of an object (2) under investigation that is produced by a penetration of the first pulsatory X-ray through the object (2), and which produces a first optical image of the object (2); first television camera means (5L); a first optical system (4L) optically-coupled between the first image intensifying means (3L) and the first television camera means (5L), which includes at least first light interrupting means (4g-L), and transfers the first optical image from the first image intensifying means (3L) to the first television camera means (5L); a second source (1R) for generating a second pulsatory X-ray; second image intensifying means (3R) which is positioned at a given angle with respect to the first image intensifying means (3L), receives an X-ray transmission image of the object (2) under investigation that is produced by a penetration of the second pulsatory X-ray through the object (2), and produces a second optical image of the object (2); second television camera means (5R); a second optical system (4R) optically-coupled between the second image intensifying means (3R) and the second television camera means (5R), which includes at least second light interrupting means (4g-R), and transfers the second optical image from the second image intensifying means (3R) to the second television camera means (5R); video selecting means (140) for selecting first and second analogue image signals that are alternately derived from the first and second television camera means (5L; 5R), respectively; A/D converting means (7) for converting the first and second analogue image signals into first and second digital image signals, respectively; store means which includes at least first and second frame memories (150; 160), and stores therein the first and second digital image signals from the A/D converting means (7), respectively; alogorithmic means (170) which performs given image processing for at least two sets of each of the first and second digital image signals independently that are previously stored in the first and second frame memories (150; 160) respectively so as to derive first and second image-processed digital signals; D/A converting means (11) for converting the first and second image-processed digital signals into first and second analogue image signals, respectively; monitor means (12) for displaying the first and second image-processed analogue image signals from the D/A converting means (7); pulse generating means (17) for generating pulse signals that are adapted to the first and second television camera means (5L; 5R) as field sync pulse signals; first camera control means (6L) for controlling at least scanning of the first optical image which is incident upon the first television camera means (5L); first optical blanking control means (130L) for controlling the blanking timing operation of the first light interrupting means (4g-L) in the first optical system (4L); second camera control means (6R) for controlling at least scanning of the second optical image which is incident upon the second television camera means (5R); second optical blanking control means (130R) for controlling the blanking timing operation of the second light interrupting means (4g-R) in the second optical system (4R); X-ray control means (110) for controlling projections of the first and second pulsatory X-rays from the first and second pulsatory X-ray generating sources (lL; lR); and system control means (120) which performs controls of the apparatus (200) in such a manner that the projection of the first pulsatory X-rays toward the object (2) commences, prior to that of the second pulsatory X-ray, in synchronized with the field sync pulse signal under the control of the X-ray control means (110), the scanning operations of the first and second television camera means (5L; 5R) are blanked out under the control of the first and second camera control means (6L; 6R), respectively and the blanking operation of the second optical interrupting means (4g-R) is carried out under the control of the second optical blanking control means (130R) while the projection of the first pulsatory X -ray is continued, and at least the blanking operation of the first light interrupting means (4g-L) commences immediately after the projection of the first pulsatory X-rays is accomplished. 7. An apparatus (200) as claimed in claim 6, characterized in that the first and second image intensifying means (3L; 3R) further comprises first and second grid control circuits (20L; 20R) connected to the first and second optical blanking control means (130L; 130R), respectively, and the first and second optical blanking control means (130L; 130R) further control the first and second image intensifying means (3L;3R) in such a manner that immediately after the projections of the pulsatory X-rays are accomplished, the first and second blanking operation of the grid control circuits (20L; 20 R ) commence, respectively.

Claim 8

An apparatus (200) as claimed in claim 6, characterized by further comprising; injector means (16) for administrating an X-ray contrast medium into the object (2), the injection of the X-ray contrast medium being controlled by the system control means (120) in synchronized with the field sync pulse signals.

Claim 9

An'apparatus (200) as claimed in claim 6, characterized in that given image processing of the algorithmic means (170) is a digital time subtraction for at least two sets of the first and second digital image signals respectively.

Claim 10

An apparatus (200) as claimed in claim 6, characterized in that given image processing of the algorithmic means (170) is digital filtering process for at least two sets of the first and second digital image signals, respectively.

Claim 11

An apparatus as claimed in claim 1, characterized in that the light interrupting means is an auto-shutter (4g) of the optical system (4) which is connected to the optical blanking control means (18), and the optical blanking control means (18) controls the optical system (4) in such a manner that immediately after the projection of the pulsatory X-ray is accomplished, the blanking operation of the auto-shutter (4g) commences.