1. A process for processing a plurality of spectral data sets (J1-Jn) intended to be exploited by a molecular imaging process, each spectral data set (J1-Jn) being defined by a set of spatial positions (Xi, Yj) with each of which is associated a molecular spectrum of at least two dimensions containing a set of molecular information (S(Xi, Yj)), the process comprising the following steps: for each data set (J1-Jn) cutting the molecular spectrum associated with each position (Xi, Yj) into several sections of spectrum (T1-Tm) each containing some of the molecular information of said spectrum, inserting the sections (T1-Tm) obtained for each position (Xi, Yj) of each data set (J1-Jn) into a database (BDD), such that a set of indexed sections of spectrum (T1-Tm) is associated with each position (Xi, Yj) of each data set (J1-Jn), selecting in the database (BDD) following a request relative to molecular information of interest, the section(s) (T1-Tm) containing the molecular information of interest, and selecting within each section (T1-Tm) said molecular information of interest.