QC of heavy ion therapy using intensifying screen-CCD camera system

The Frequency-Distance Relation (FDR) method is a well-known powerful method that can improve the spatial resolution of a reconstructed image in single photon emission computed tomography (SPECT). This method is based on the Fourier correction of spatially variant collimator blurring. It may be applicable to the correction for spatially variant multiple Coulomb scattering blurring in heavy ion CT. In this paper, we report on the preliminary results of an application of FDR to a sinogram, which was measured by a heavy ion CT system based on the measurement of residual range distribution. Furthermore, photoluminescence spectra of an intensifying screen for the heavy ion beam and X-ray beam were measured to investigate the improvement of sensitivity of screen-charge coupled device (CCD) camera. (author)