Method and arrangement for processing measurement data

An arrangement for measuring radiation comprising a charge coupled device with a matrix of charge wells arranged in rows and columns of pixels, wherein at least one of said pixels is defected, the arrangement also comprising

• a serial register for receiving charges from a column of the parallel register pixels,
• output well for receiving charges from the serial register,
• means for measuring the charge from the output well, and
• means for accumulating charges from at least two pixels,
• characterised in that the arrangement further comprises
• means for determining the accumulated pixels on the basis of the position(s) of said at least one defected pixel, and
• means for initiating reading a value of the charge of the output charge well charges when distorted value enter the charge well of the serial register, which is closest to the output charge well.

A method for measuring radiation from an object, with a charge coupled device comprising a matrix of pixels arranged in rows and columns, wherein at least one pixel is defected, in which method

• the radiation creates charges to the charge wells of the pixels,
• charges from a column of the pixels are shifted to a serial register,
• the charges in a serial register are shifted to an output charge well,
• the charge is measured from the output charge well, and
• charges from at least two pixels are accumulated into the output charge well, wherein,
• the pixels whose charges are accumulated are determined on the basis of the position(s) of said at least one defected pixel so that defective pixel values do not propagate beyond the output charge well, and
• a value of the charge of the output charge well is read when charges of distorted value enter the charge well of the serial register, which is closest to the output charge well.