Abstract: A plurality of regions of interest can be set to be monitored. From a keyboard (17) or a mouse (19), ROI position information and CT value conditions for the ROI's are set to a ROI position information memory (39) and a ROI condition memory (21), respectively. An image reconstruction system (9) reconstructs data of a first scan stored in a projection data memory, displays as a reconstruct image (59) on a display device (13) via an image memory (11), and calculates individual representative CT values of the ROI's set as the ROI position information, storing in the image memory (11). A condition decision section (43) of a CPU (15) makes decisions of whether the representative CT values of the ROI's meet the conditions in the ROI condition memory (21), executes an operation between respective results of the decisions to decide whether the first scan is to be continued or shifted to a second scan.

Abstract: Projection data is repeatedly acquired by a helical scan operation. Tomographic image data is repeatedly reconstructed on the basis of projection data. Generally, in a helical scan operation, in order to reduce the artifact, interpolation processing of projection data is indispensable. Tomographic image is reconstructed on the basis of acquired original projection data without performing this interpolation processing so as to meet the condition that the time required to reconstruct tomographic image data on the basis of one set of projection data required for the reconstruction of tomographic image data be shorter than that required to acquire one set of projection data. The real-time mode can therefore be introduced into a helical scan operation.

Abstract: There is provided a radiotherapy system comprising: a radiotherapy planning CT system integratedly having an X-ray scanner member for acquiring image data of a diagnostic portion of a subject by irradiating X-rays to the subject, said diagnostic portion including a lesion, a radiotherapy planner member for displaying the image data and producing radiotherapy plan data including a position data of an isocenter and a contour data of a radiation field limiting radiations from a virtual radiation source irradiated into the diagnostic portion, and a positioning member for automatically pointing a marking position on the subject based on the position data of the isocenter; and a radiotherapy apparatus for carrying out radiotherapy on the basis of the therapy plan data.

Abstract: In an X-ray CT (computerized tomographic) apparatus, a simple programmable anatomical selecting operation is realized. The X-ray CT apparatus comprises: selecting means for selecting at least one of imaging sorts and imaging portions with respect to a biological body under medical examination; means for programming a medical examination scheme based upon the one of imaging sorts and imaging portions of the biological body; first storage means for storing therein the programmed examination scheme; and, means for reading out the programmed examination scheme from the first storage means so as to sequentially execute functions of the programmed examination scheme.