Here you can find details on different ways of using SpectralAnalysis and freely available MSI data that can be used for testing.
This mouse brain dataset is available alongside SpectralAnalysis. It was acquired using MALDI MSI with a QSTAR XL mass spectrometer.
This mouse bladded dataset is available from the PRIDE repository. It was acquired using MALDI MSI with a AP-SMALDI imaging source coupled to an Orbitrap mass spectrometer.