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Abstract

A method of decomposition into one component {f.sub.1 }, called the total absorption component, and one component {f.sub.k } called the diffused component of energy spectra {t.sub.i } for N image elements i of a scintigraphic image. The method of decomposition includes the steps of: a) sampling the energy in the form of P samples j; b) recording the values t.sub.i (j) of each spectrum {t.sub.i }; c) constructing the table Y of the t.sub.i' (j) values; d) determining the base of specific vectors {v.sub.q } (q=0, 1, 2, . . . , P-1) that are specific orthogonal vectors of the matrix Y, classified by order of decreasing values; e) determining the K fundamental spectra {f.sub.k } in the space generated by the Q (Q.ltoreq.P) first specific vectors {v.sub.q } by applying appropriate constraints to the coefficients b.sub.kq defined by: ##EQU1## f) projecting the image element spectra {t.sub.i } onto the base of the fundamental spectra {f.sub.k } to obtain the decomposition sought.

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