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Related Experiment Video

Updated: Feb 14, 2026

The Use of Ex Vivo Whole-organ Imaging and Quantitative Tissue Histology to Determine the Bio-distribution of Fluorescently Labeled Molecules
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Quantitative ptychographic bio-imaging in the water window.

Max Rose, Tobias Senkbeil, Andreas R von Gundlach

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    Coherent X-ray ptychography enables high-resolution, dose-efficient nano-imaging of biological cells. This method achieved high contrast and quantitative imaging of a fibroblast cell, paving the way for advanced biological sample analysis.

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    Area of Science:

    • X-ray imaging
    • Biophysics
    • Materials Science

    Background:

    • Coherent X-ray ptychography (CXP) is a lensless imaging technique.
    • It offers high dose efficiency for biological sample imaging.
    • Previous limitations included dynamic range and resolution.

    Purpose of the Study:

    • To demonstrate quantitative nano-imaging of a biological cell using CXP.
    • To improve the dynamic range of CXP measurements.
    • To assess the feasibility of imaging unstained, hydrated biological samples.

    Main Methods:

    • Utilized partially coherent soft X-ray synchrotron radiation.
    • Employed CXP with and without a beam stop for enhanced dynamic range.
    • Performed quantitative analysis of diffraction data.

    Main Results:

    • Obtained a quantitative image of a dried, unstained fibroblast cell.
    • Achieved a high dynamic range of 1.7·10^6.
    • Measured refractive index values and achieved 53% contrast at 71 nm resolution.
    • Applied a dose of 9.5·10^4 Gy, below the radiation damage threshold.

    Conclusions:

    • The developed CXP method allows for high-resolution, quantitative nano-imaging of biological samples.
    • The beam stop technique significantly improves detector dynamic range.
    • This approach is suitable for imaging various biological samples, including hydrated and cryo-preserved cells.