A new correction method for gamma camera non-uniformity due to energy response variability.
We present a new uniformity correction (Fourier energy correction) which is designed to correct for gamma camera non-uniformity caused by variations of the energy response function within a wide spectral range. A convolution model is used to describe the spatial distortions of the energy response function. The model is solved in Fourier space. A preliminary flood acquisition is required to obtain energy-dependent Fourier weights which are used to correct subsequent acquisitions. The influence of the parameters involved in the correction procedure is studied and the Fourier energy correction is compared to a conventional multiplicative energy correction for different acquisition geometries. The Fourier energy correction appears especially useful when the energy information associated with each detected photon is analysed using a fine sampling, or when windows different from the photopeak window are used.
D055592:Biophysical Phenomena; D001703:Biophysics; D005583:Fourier Analysis; D015902:Gamma Cameras / Q000706:statistics & numerical data; D006801:Humans; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D011877:Radionuclide Imaging / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D012542:Scattering, Radiation