Abstract: A series of data access is performed wherein a representative pixel of each divided region obtained by dividing an original image frame into a plurality of regions is sequentially accessed while increasing the number of divisions. The series of data access is repeated for each bit string so that data of each bit string obtained by dividing gradation data of each pixel into a plurality of bit strings are sequentially read out from the upper string to the lower bit string, and the resultant data are sequentially stored in a storage medium. In this manner, image data of a plurality of frames are stored in the storage medium. The image data of a plurality of frames stored in the storage medium are read out in units of predetermined number of data for each image data, and data of pixels which have not yet been read out in each image frame are interpolated and displayed.

Abstract: An optical image processing method and system in a radiographic system, wherein an image of an object is produced by an image intensifier and converted to video signal by a television (TV) camera system. A liquid crystal display (LCD) is placed bewteen the image intensifier and the T.V. camera system at a location shifted from a focal plane of the T.V. camera system. The liquid crystal display defines plural pixels which are controllable so that light produced by the image intensifier and impinging on the plural LCD pixels can be selectively attenuated by application of selected control signals to the LCD. Control signals are generated selectively based on predetermined parameters of the radiographic system and the image. These control signals are applied to the LCD to perform selective attenuation and corresponding dynamic range compression of light passing through respective LCD pixels, thereby to perform unsharp masking of the image produced by the image intensifier using the LCD.

Abstract: The radiation image in a radiation imaging system is improved by extracting a scatter distribution and subtracting the scatter distribution from the radiation image. The scatter distribution is extracted from the radiation image by an adaptive filter using a scatter-glare point spread function. The scatter-glare point spread function is obtained by measurements of the radiation system.

Abstract: In an X-ray diagnostic apparatus, it is very desirable to mitigate the adverse effect of the scattered X-ray components. When the X-ray shield member is positioned in the X-ray projection area during the first X-ray projection period, the first X-ray transmission image data is obtained. From this X-ray transmission image data, the scattered X-ray component data is calculated in the interpolation method of a SINC function. When the X-ray shield member is removed from the X-ray projection area during the second X-ray projection period, the second X-ray transmission image data is obtained that includes not only the primary X-ray components but also the scattered X-ray components. The desirable X-ray transmission image data is obtained by subtracting the first image data from the second image data.

Abstract: An X-ray diagnostic apparatus comprises, an X-ray radiation source for generating an X-ray and projecting the same toward an object, an X-ray detector for detecting the X-ray which has transmitted through the object to derive a total X-ray intensity signal of the object including a primary X-ray signal component and a scattered X-ray signal component, a signal processor which processes the X-ray intensity signal detected from the X-ray detector in such a manner that a scattered X-ray intensity distribution which is pre-calculated based upon the X-ray intensity signal is eliminated from an X-ray intensity distribution obtained from the X-ray intensity signal so as to derive a distribution function of the primary X-ray signal component without adverse influences on the scattered X-ray signal component, and a monitor for displaying a distribution from based upon the distribution function of the primary X-ray signal component.

Abstract: In a digital intravenous subtraction fluorographic system, X-ray subtraction images obtained by performing a subtraction between the precontrast images and the post-contrast images are processed by comparing, for each pixel, the value of the pixel image data in the difference image with a predetermined threshold intensity value, and recognizing the time until the value of the pixel image data reaches the threshold intensity value. The resulting time data so determined in the processor is used for displaying the distribution of contrast medium in the vessel in relation to the time periods it takes for each pixel to attain the predetermined threshold intensity. In effect, the time data for each pixel is itself converted to an intensity signal dependent on the amount of time it takes for each pixel to cross the predetermined threshold intensity, and it is the time period derived intensity signal which is displayed.

Abstract: A diagnostic X-ray apparatus emitting pulsed X-ray radiation includes a processor for performing digital X-ray subtraction of a previous mask image from current images. The apparatus includes circuitry for digitization of the video signals from an image intensifier-TV chain, digital subtraction to obtain digital difference signals, and subsequent reconversion of the resultant digital difference video signals to analog signals. Pulsed X-ray exposures are performed during the blanking periods of the TV camera following which the television fields immediately following the pulsed X-ray exposure are scanned and read out, and are supplied to the processor for performing the digital X-ray subtraction.

Abstract: An X-ray image data of a patient into which an X-ray contrast medium is being administered is processed in an X-ray image data processing apparatus so as to obtain the X-ray image data having an improved S/N ratio. The processing apparatus mainly comprises a linear differential filter that is composed of a plurality of multipliers and an adder. The X-ray image data is multiplied by a plurality of differential coefficients, and thereafter the results of these multiplications are summed.

Abstract: In an X-ray television diagnostic apparatus, the blanking operation of the grid control circuit for the image intensifier and also the scanning operation of the television camera are interrupted during the projection of pulsatory X-rays from the X-ray tube, and at least the blanking operation for the image intensifier commences immediately after the projection of the pulsatory X-rays is accomplished.

Abstract: An X-ray diagnostic apparatus comprises an X-ray radiation source for generating an X-ray and projecting the same toward an object, an X-ray detector for detecting the X-ray which has transmitted through the object to derive a total X-ray intensity distribution signal of the object including a primary X-ray signal component and a scattered X-ray signal component caused by scattered X-rays and system structural factors, a signal processor which processes the X-ray intensity distribution signal detected from the X-ray detector in such a manner that a scattered X-ray intensity distribution which is pre-calculated based upon the X-ray intensity distribution signal is eliminated from an X-ray intensity distribution obtained from the X-ray intensity distribution signal so as to derive a distribution function of the primary X-ray signal component without adverse influences on the scattered X-ray signal component, and a monitor for displaying a distribution form based upon the distribution function of the primary X-r

Abstract: A diagnostic X-ray apparatus emitting X-ray radiation with a digital X-ray subtraction imaging technique which comprises digitization of video signals from an image intensifier-T.V. chain, digital subtraction and reconversion of the resulting digital difference video signals to analog signals under control of a master timing control unit. The master timing control unit comprises a clock for generating basic clock pulses supplied to a synchronizing delay circuit for generating a plurality of delayed clock pulses which are selected by a predetermined formula, and the resulting pulses are used to maintain the entire system in a proper phase relationship.

Abstract: An X-ray image pick-up device includes an X-ray source for radiating X-rays onto an object including a region of interest, an image intensifier for converting to an optical image an X-ray image obtained when the X-rays radiated from the X-ray source are transmitted through the object, an image pick-up camera for converting to an image pick-up signal the optical image which is generated from the image intensifier, and an optical diaphragm arranged between the image intensifier and the image pick-up camera for adjusting an amount of optical image light incident on the image pick-up camera.