Abstract: In an X-ray apparatus in which an FPD-4 moves independently of an X-ray tube, an X-ray irradiation area discriminator discriminates, for separate X-raying actions, X-ray irradiation area images from among X-ray images outputted from the FPD-4. An X-ray tube position sensor acquires position information P on the X-ray tube for the separate X-raying actions. A long image creator creates a long image by shifting the X-ray irradiation area images based on the position information, and splicing the X-ray irradiation area images together. Therefore, even when a relative position between the X-ray tube and FPD-4 is variable instead of being constant, the X-ray irradiation area images can be obtained reliably, and these can be spliced together with high accuracy. There is no need to uniform starting timing and moving speed of the X-ray tube and FPD-4, which simplifies control.

Abstract: In an X-ray apparatus in which an FPD moves independently of an X-ray tube, an X-ray irradiation area discriminator discriminates, for separate X-raying actions, X-ray irradiation area images from among X-ray images outputted from the FPD. An X-ray tube position sensor acquires position information P on the X-ray tube for the separate X-raying actions. A long image creator creates a long image by shifting the X-ray irradiation area images based on the position information, and splicing the X-ray irradiation area images together. Therefore, even when a relative position between the X-ray tube and FPD is variable instead of being constant, the X-ray irradiation area images can be obtained reliably, and these can be spliced together with high accuracy. There is no need to uniform starting timing and moving speed of the X-ray tube and FPD, which simplifies control.

Abstract: A memory includes a collected projection data storage area having, set thereto, a ring buffer area with a storage capacity for storing projection data for angles necessary to reconstruct at least one image, and a normal buffer area with a storage capacity for storing projection data for angles necessary to reconstruct numerous images. When projection data collected by a scanner need not be saved for later use, the projection data is stored and updated in the ring buffer area. Each time projection data for one image has been stored, the image is reconstructed and displayed on an image display. Projection data which should be saved is stored successively, without rewriting, in the normal buffer area. Each time projection data for one image has been stored, the image is reconstructed and displayed on the image display.

Abstract: A radiographic apparatus is disclosed, which allows a biopsy needle or a drug injection needle to be run into a patient accurately and quickly. Once a needle entry point on a body surface of the patient and a target point in the patient are designated and inputted on the screen of a display monitor, the radiographic apparatus in this invention automatically displays, en block on the display monitor, a guideline linking the two points, intersection marks indicative of intersections of the guideline and CT images, and angles and length serving as a reference for determining a direction and depth of running the needle. The operator has only to run the needle to a required depth along the guideline and intersection marks in the direction indicated by the angles displayed. Thus, the biopsy needle or injection needle may be run into the patient accurately and quickly.

Abstract: A memory includes a collected projection data storage area having, set thereto, a ring buffer area with a storage capacity for storing projection data for angles necessary to reconstruct at least one image, and a normal buffer area with a storage capacity for storing projection data for angles necessary to reconstruct numerous images. When projection data collected by a scanner need not be saved for later use, the projection data is stored and updated in the ring buffer area. Each time projection data for one image has been stored, the image is reconstructed and displayed on an image display. Projection data which should be saved is stored successively, without rewriting, in the normal buffer area. Each time projection data for one image has been stored, the image is reconstructed and displayed on the image display.

Abstract: This invention provides an X-ray CT apparatus for performing a pre-CT which is a form of computerized tomography carried out with low doses beforehand in order to determine timing of starting a production CT which is a form of computerized tomography for acquiring images for use in diagnosis. As a radiographic mode of the pre-CT executed for a monitoring purpose, a radiographic mode suited to the purpose is selected from among three radiographic modes, i.e. a continuous radiographic mode, an intermittent radiographic mode and a combined intermittent and continuous radiographic mode. The apparatus may set, as necessary, a delay time lasting from a point of time when a pre-CT starting instruction is given to a point of time for starting the pre-CT. A coloring state of a contrast medium in a region of concern may be determined accurately at all times by executing the pre-CT. The pre-CT is started, and a switch from intermittent radiography to continuous radiography is carried out, always at appropriate times.