In this paper a powerful image analysis technique based on the multivariate analysis of photon spectra coming from a Compton scattering process is presented to study the electronic density of a phantom model simulating a homoge- neous background material with insertion of different composition. The photon spectra have been measured by the Enhanced Compton Spectrometer (ECoSp) device performing a voxel-by-voxel linear scan of phantom models simu- lating both the homogeneous and inhomogeneous material composition. Some spectral energy windows containing either or both inelastic and elastic scattered photons have been selected and collected in a single multi variate data matrix X. The Multivariate Image Analysis (MIA) ofthe matrix X allows one to indicate the presence ofheterogeneous materials in a given voxel by dissecting its contribution from the overall variability ofthe data matrix. The MIA leads to a series of images that describes the sample elemental composition.
Multivariate image analysis of ECoSp Compton spectra
BONIFAZZI, Claudio;MUZZIOLI, Valerio;
2004
Abstract
In this paper a powerful image analysis technique based on the multivariate analysis of photon spectra coming from a Compton scattering process is presented to study the electronic density of a phantom model simulating a homoge- neous background material with insertion of different composition. The photon spectra have been measured by the Enhanced Compton Spectrometer (ECoSp) device performing a voxel-by-voxel linear scan of phantom models simu- lating both the homogeneous and inhomogeneous material composition. Some spectral energy windows containing either or both inelastic and elastic scattered photons have been selected and collected in a single multi variate data matrix X. The Multivariate Image Analysis (MIA) ofthe matrix X allows one to indicate the presence ofheterogeneous materials in a given voxel by dissecting its contribution from the overall variability ofthe data matrix. The MIA leads to a series of images that describes the sample elemental composition.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
