X-ray imaging of various biological samples using a phase-contrast hard X-ray microscope

Area of Science:

• Biophysics
• Microscopy
• Materials Science

Background:

• Advanced microscopy techniques are crucial for understanding cellular and tissue structures.
• Existing high-resolution imaging methods face limitations with thick, non-transparent biological samples.

Purpose of the Study:

• To determine optimal conditions for imaging bio-samples using a 7 keV hard X-ray microscope.
• To evaluate the capability of hard X-ray microscopy for visualizing unstained biological tissues at high resolution.

Main Methods:

• Utilized a 7 keV hard X-ray microscope at the Pohang Light Source.
• Imaged dehydrated human cells and mouse tumor tissues.
• Optimized sample conditions for the hard X-ray microscope.

Main Results:

• Achieved spatial resolution better than 100 nm for intercellular and intracellular structures.
• Successfully visualized unstained dehydrated human cells and mouse tumor tissues.
• Demonstrated suitability of hard X-ray microscopy for thick (tens of micrometers) metastasized lung tissue.

Conclusions:

• Hard X-ray microscopy provides high-resolution imaging of biological samples without staining.
• This technique overcomes limitations of other microscopes for thick, non-transparent tissues.
• The 7 keV hard X-ray microscope is a powerful tool for bio-imaging research.