Method of producing an X-ray exposure by means of a photoconductor and arrangement for carrying out the method

Apparatus for producing an X-ray exposure by means of a photoconductor layer which tends to self-discharge with a characteristic function and which converts X-radiation into a charge pattern, is evenly charged locally before the X-ray exposure, is discharged by the exposure as a function of the intensity of the X-radiation and the surface of which is scanned after the exposure for detecting the charge density, an image value being formed for each image point corresponding to the discharge at that image point, said image tending to include artifacts caused by said self-discharge, said apparatus comprising:

• a photoconductor layer on a conducting carrier;
• an electrometer for detecting the charge density at individual points of the photoconductor layer;
• memory means for storing the image values proportional to the charge density, said memory means including first means for storing the image values of successive X-ray exposures and second means for storing values representing the characteristic discharge function;
• first processing means responsive to said stored image values and stored discharge values for determining the self-discharge of the photoconductor layer taking place after the end of exposure at various image points from the values contained in the first and second means;
• and
• second processing means responsive to the determined self-discharge for correcting the image values of said image for the effects of said self-discharge to substantially alleviate said artifacts.