Abstract: To provide an X-ray CT apparatus and an image reconstruction method that can generate an image in which motion influence of a site to be scanned is reduced, the image processing device 403 of the X-ray CT apparatus 1 calculates a reconstruction data range which is a range of projection data to be used for reconstruction based on a motion direction of the site to be scanned. An image is reconstructed using the projection data in the calculated reconstruction data range. The reconstruction data range is set as the projection data in a projection range of at least 180 degrees or more including a projection direction that approximately corresponding to the motion direction of the site to be scanned.

Abstract: To provide an X-ray CT apparatus and an image reconstruction method that can generate an image in which motion influence of a site to be scanned is reduced, the image processing device 403 of the X-ray CT apparatus 1 calculates a reconstruction data range which is a range of projection data to be used for reconstruction based on a motion direction of the site to be scanned. An image is reconstructed using the projection data in the calculated reconstruction data range. The reconstruction data range is set as the projection data in a projection range of at least 180 degrees or more including a projection direction that approximately corresponding to the motion direction of the site to be scanned.

Abstract: The active vibration-isolating device of the invention is used for preventing vibrations due to ground motions or running of an automobile from being propagated to a platform which is disposed in, for example, a semiconductor device factory or a laser device factory, and on which various kinds of equipment are to be mounted, and also from causing the platform to vibrate. The device has: an air spring which elastically supports a platform; a piston-like member which abuts against and supports the platform; plural piezoelectric actuators which can be externally controlled; a working fluid such as an aqueous solution of ethylene glycol which transmits driving displacements of the piezoelectric actuators to the piston-like member via piston members which are respectively fixed to ends of the piezoelectric actuators in a driving direction x; and a fluid path in which the working fluid is hermetically filled.

Abstract: A fluid-damping vibration-isolating support device comprising a main support body having a rubber base member and a closed enclosure internally thereof; and a partition plate dividing the enclosure into two chambers which intercommunicate through an orifice and are filled with a liquid. The partition plate comprises a separator member and a stopper member. The separator member is formed of an outer peripheral thick wall portion having an orifice and an inner thin flat plate portion having at least one through-hole. The stopper member has two opposed plate sections provided so as to cover the through-hole and is captured to the separator member slightly movably to the degree that the plate sections are in contact with or separate from both faces of the flat plate portion. The stopper member serves to close upon low frequency vibration and open upon high frequency vibration, so that in the high frequency region rise of hydraulic pressure can be suppressed and dynamic spring rate can be lowered.

Abstract: A rubber vibration insulator comprising a boss member as one fitting, a tubular body, an annular elastic member interposed between the boss member and one end of the tubular body, a plate member as the other fitting surrounding fixedly the opposite end of the tubular body, thus forming together with the aforesaid elements a sealed chamber having variable volume, and a capsule housed in the sealed chamber, in which a damping liquid is filled. The capsule comprises an external shell consisting of a rubber plate having an orifice and a plate body joined together and a diaphragm disposed transversely in the shell, thereby dividing its internal chamber into an air sub-chamber on the rubber plate side and a liquid sub-chamber on the plate body side. The rubber plate of the shell may be defined with recesses on both sides in a vertical symmetry and dispersedly to form thin film portions or be in the form of a thin rubber plate which is interposed between two porous plates at a clearance and play between them.

Abstract: A vibration-absorbing engine mounting device with fluid damping which comprises: an upper mounting member, a lower mounting member, a rubber wall body interposed between both the mounting members with its upper and lower portions being air-tightly bonded to the upper and lower mounting members, respectively, a block damper transversely provided in the rubber wall body, and a capsule encased in a space enclosed by the former four members, thus defining a closed chamber enclosed by the former five members. The capsule comprises an exterior rigid case, an interior sealed bag encapsulated in the rigid case, defining a sacciform chamber and an orifice member entering the former two. The closed chamber and the sacciform chamber are filled with fluid, whereby they are put in communication with one another by the passage of fluid via the orifice member.