Intracellular motion (IM) is originated from the motion of molecules and organelles in the cytoplasm of eukaryotic cells. IM is essential for the proper functioning of cells. Instead of tracking specific molecules, coherent gated methods measure the speckle variation induced by IM. Initially, holographic optical coherence imaging was used to image the IM of tumor spheroids and drugs' responses1,2 . Later on, with optical coherence tomography (OCT), IM has been used as an endogenous contrast to reveal the cellular and subcellular structures with freshly excised tissue. The uniqueness of the coherent gated method is that it can detect IM at different depths without requiring fluorescence tagging. Therefore, the imaged objects can stay at a more natural status.
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