| 摘要 |
An X-ray generator projects X-rays into an object under examination. An X-ray detector detects the X-ray image data transmitted through the object. The transmitted X-ray image data is digitized by an A/D converter and visually displayed by a monitor. For effecting such display, an X-ray shield member having an X-ray shield section configured in a predetermined pattern is set in an X-ray projection area. The transmitted X-ray image data containing the X-ray shield section data obtained under this condition is supplied to a scattered X-ray intensity computing circuit through first and second switching circuits and a memory. The computing circuit computes the scattered X-ray component. Then, the X-ray shield member is retracted from the X-ray projection area. Under this condition, the transmitted X-ray image data is supplied through the first and second switching circuits to a subtracting circuit. The substracting circuit subtracts the scattered X-ray component previously obtained from the transmitted X-ray image data, thereby to send only the primary X-ray component to the monitor.
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