Split energy level radiation detection

Details Split energy level radiation detection Split energy level radiation detection

1986-11-25

1990-10-16

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

25037001, 25037006, 25037009, 25037011, 378156, G01T 116

Patent

active

049637460

ABSTRACT:
An energy discriminating apparatus and method is disclosed for use in connection with digital radiography and fluoroscopy. In use of the detection system and method an X-ray source is actuated to direct X-rays through a patient's body, the X-rays including both higher and lower energy radiation. A first detector element, including a plurality of segments each segment including a phosphor coating layer and a sensor, is positioned opposite the source to receive and respond predominantly to X-rays in a lower energy range, the remaining X-rays, being generally of higher energy, passing through the first detector element. A second detector element, also including a plurality of segments, each segment including a phosphor coating layer and a sensor, is positioned to receive and respond to the higher energy radiation passing through the first element. The sensors are coupled respectively to each detector element segment for substantially simultaneously sensing the response and spatial location, relative to the detector elements, of radiation to which each detector element respectively responds. A filter element is interposed between the first and second detectors to enhance discrimination in the energy response of the respective detector elements. Particular filter materials and detector phosphor materials and coating weights are identified which optimize the detectors performance. The sensors produce separately and simultaneously information representing patterns of relatively lower and higher energy emergent from the patient's body. Digital data processing and conversion equipment responds to the sensors to produce digital information representing each of said images, which can be digitally processed to enhance image characteristics.

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