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. Author manuscript; available in PMC: 2021 Jul 1.
Published in final edited form as: Annu Rev Biomed Data Sci. 2020 Apr 13;3:61–87. doi: 10.1146/annurev-biodatasci-011420-031537

Figure 2.

Figure 2

An imaging mass spectrometry (MS) dataset represents a collection of spectra acquired from a raster of pixels representing the surface of a tissue section. Peaks are often reduced to centroids, especially for Fourier transform ion cyclotron resonance and Orbitrap high-resolving power analyzers. An ion image represents relative intensities of the ion across all pixels. An imaging MS dataset can represent spatial localization of up to 103 molecules at a false discovery rate (FDR) of 10%.