System for quantitative radiographic imaging

摘要

A system for spectroscopic imaging of bodily tissue in which a scintillation screen and a charged coupled device (CCD) are used to accurately image selected tissue. Applications include the imaging of radionuclide distributions within the human body or the use of a dual energy source to provide a dual photon bone densitometry apparatus that uses stationary or scanning acquisition techniques. An x-ray source generates x-rays which pass through a region of a subject's body, forming an x-ray image which reaches the scintillation screen. The scintillation screen reradiates a spatial intensity pattern corresponding to the image, the pattern being detected by a CCD sensor. The image is digitized by the sensor and processed by a controller before being stored as an electronic image. A dual energy x-ray source that delivers two different energy levels provides quantitative information regarding the object being imaged using dual photon absorptiometry techniques. Dual scintillation screens can be used to simultaneously generate images of low-energy and high-energy x-ray patterns. Each image is directed onto an associated respective CCD or amorphous silicon detector to generate individual electronic representations of the separate images.