The quadrupole acts as a mass filter, selecting specific parent ions by m/z to enter the collision cell for fragmentation or to pass directly through; the subsequent TOF analyzer separates ions by flight time in a pulsed electric field, providing high-resolution full spectra. The two-stage tandem gives Q-TOF both parent-ion screening and high-resolution detection capabilities.
Because TOF can acquire the complete m/z range in each pulse, Q-TOF has high speed in imaging point-by-point acquisition, suitable for mass spectrometry imaging requiring large fields of view and many pixels.
Q-TOF is often paired with imaging sources such as MALDI, DESI, LDPI, and DPI as the high-resolution detection end. Its high resolution aids molecular assignment, and its MS/MS capability can perform structural confirmation on pixels of interest, fitting the workflow of soft-ionization imaging + on-demand fragment verification.
Compared with Orbitrap, Q-TOF usually has an advantage in acquisition speed; compared with single TOF, Q-TOF adds parent-ion screening and tandem capability, suitable for complex samples requiring fragment information.
The high-resolution spectra produced by Q-TOF imaging are often exchanged in formats such as imzML and visualized in SCiLS Lab and MetaboScape. For ambient matrix-free imaging, Neo-Source LDPI/DPI can be externally added to a Q-TOF with an ambient interface, forming a fast high-resolution imaging solution.
In drug-distribution, lipid, and metabolite spatial-map research, the high speed and high resolution of Q-TOF are especially practical, able to cover larger tissue regions in reasonable time.
Q-TOF is suitable for imaging projects needing high resolution + fast acquisition + optional MS/MS; if ultimate mass accuracy is prioritized, choose Orbitrap; if ultimate pixel speed/resolution is prioritized, evaluate TOF-SIMS. The final choice depends on analyte, field of view, and throughput.
For building a new matrix-free ambient imaging line, LDPI/DPI + Q-TOF is one of the fast high-resolution routes; it is recommended to confirm host ambient interface and data-format compatibility.
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).