Wednesday, 23 June 2010

DIRECT CONVERSION OF X-RAY

1) Most of the digital radiography systems which are based on charge-coupled device (CCD) and amorphous silicon (a-Si) are indirect conversion type that uses scintillator to convert incident X-ray into visible light.
2) That is, they need two-step process to get electronic signal for digital image and the image quality is significantly affected by scintillator.
3) MIC detector is direct conversion type. The X-ray irradiation which passed through the patient penetrates into the space between the electrodes and the gas filled in the chamber is ionized to generate charges on the corresponding electrodes.
4) The induced charges are read directly by electronics.

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