MRI/PET provide anatomical and functional images but barely distinguish molecular species; IHC can precisely localize a single known protein yet only views one or two targets at a time. MSI acquires a mass spectrum at every pixel and can in principle simultaneously present the spatial distribution of hundreds to thousands of metabolites, lipids, drugs and peptides.
This means MSI is 'hypothesis-free': you do not need to guess in advance which molecule matters; instead the data tell you which molecules are enriched in a given region. This is fundamentally different from IHC's 'form a hypothesis first, then look at one target' approach.
MRI/PET cover whole organs at the macroscopic scale; IHC views protein localization at the subcellular scale; MSI sits in between, covering everything from the tissue scale (DESI/DPI tens to hundreds of micrometers) to the single-cell scale (LDPI 2–3 μm).
Neo-Source LDPI advances MSI to the single-cell / subcellular chemical space at 2–3 μm, allowing 'molecular distribution' and 'cell type' to be read on the same scale—something traditional macroscopic imaging cannot do.
The shortcoming of MSI is that it usually does not directly yield protein sequences or gene expression, and it requires tissue sections. Therefore it is often combined with MRI/PET (macroscopic localization), IHC/immunofluorescence (known-target validation): use MSI to discover differential molecules, IHC to validate targets, and MRI to view the overall lesion.
Once the three are registered, they form a three-tier evidence chain of 'macroscopic—molecular—target.' In tumor research this combination has been used to discover new molecular markers and validate their histological localization.
When you need to 'discover' unknown differential molecules (e.g., drug metabolic heterogeneity, tumor metabolic reprogramming), MSI; when you need macroscopic staging / function, MRI/PET; when you need to validate known targets, IHC.
The basis for choice is not 'which is better' but 'at which level the question lies.' MSI's unique value is overlaying omics-level molecular information onto spatial coordinates, which conventional imaging cannot replace.
To obtain detailed specifications, compatible models, or a quotation for the MSI LDPI / DPI full series imaging ion sources, visit the Neo-Source official website, or contact the official team for compatibility advice tailored to your mass spectrometer (Agilent / SCIEX / Thermo and other mainstream MS).