Micro focus CT machineIt is a high-resolution non-destructive testing device based on a micro focus X-ray source, which achieves precise imaging of the internal structure of the sample through cone beam scanning and 3D reconstruction algorithms. Its core advantages lie in micrometer level resolution (up to 0.5 μ m) and non-destructive detection, which can clearly present the internal three-dimensional structure of bones, teeth, materials, and industrial devices, filling the gap of traditional scanning electron microscopy that can only characterize the surface two-dimensional structure.
Micro focus CT uses extremely small X-ray focal points (usually 3-50 μ m), combined with cone beam scanning technology, to collect data from multiple angles by rotating the sample or radiation source, and reconstruct a three-dimensional model through computer.
slightFocus CT machineOperation process:
1、 Preparation before the experiment
security check
Ensure that the laboratory environment meets equipment requirements (temperature, humidity, shock resistance, electromagnetic interference, etc.).
Check if the equipment is properly grounded and if the power supply is stable.
Confirm that radiation protection measures are in place (such as closed lead doors and normal warning lights).
Sample preparation
Proper processing (such as fixation, dehydration, staining to enhance contrast, etc.) should be carried out according to the type of sample (biological tissue, material, electronic components, etc.).
Fix the sample on a dedicated sample stage to ensure that it does not move or deform during the scanning process.
Please note that the sample size should comply with the scanning chamber limitations of the equipment.
Software startup and system initialization
Turn on the computer and Micro CT host power.
Start control software (such as GE MicroView, Bruker CTVox, Nikon CT Pro, etc.).
Perform system self-test and X-ray source preheating (usually takes 10-30 minutes) to stabilize tube pressure and flow.
2、 Parameter setting and scanning
Place the sample
Open the protective hatch and place the sample stage in the center of rotation position.
Close the cabin door and activate the vacuum or inert gas environment (if necessary).
Positioning and Focusing
Use low-dose X-rays for a pre scan (scout view) to determine the position of the sample in the field of view.
Adjust the position of the sample to align its rotation center with the X-ray focus.
Set the focal size of the microfocus X-ray source (usually 1-10 μ m) to balance resolution and penetration capability.
Scan parameter settings
Voltage (kV) and current (μ A): Select the appropriate X-ray energy based on the sample density and thickness.
Resolution: Set the pixel size (such as 1 μ m, 5 μ m, etc.), determined by the distance between the source sample detector.
Projection count: Typically, 500-2000 projection images from different angles are collected, with angle steps evenly distributed at 180 ° or 360 °.
Exposure time: Adjust the exposure time for each frame according to the signal-to-noise ratio requirements.
Filter: Use aluminum, copper, and other filters to remove low-energy X-rays and reduce artifacts.
Start scanning
After confirming that all parameters are correct, start the automatic scanning program.
Monitor the scanning process and pay attention to the system status (temperature, radiation dose, image quality, etc.).
3、 Image reconstruction
data transmission
After scanning is completed, the raw projection data is transmitted to the workstation.
image reconstruction
Use algorithms such as Filter Back Projection (FBP) and Iterative Reconstruction (SIRT) for 3D reconstruction.
The software automatically generates a series of cross-sectional slice images (in TIFF or DICOM format).
post-processing
Perform noise reduction, ring artifact removal, contrast enhancement, and other processing.
Generate 3D visualization models (surface rendering or volume rendering).
4、 Data analysis and storage
3D visualization
Use professional software such as Amira, Mimics, Dragonfly for structural observation, segmentation, and measurement.
quantitative analysis
Calculate parameters such as porosity, particle size distribution, connectivity, and wall thickness.
data saving
Save raw data, reconstruct images, analyze results, and record experimental parameters.
5、 Post experiment operation
Shut down the system
Turn off the X-ray source and turn off the host power after cooling down.
Take out the sample and clean the sample table.
Maintenance Record
Record usage time, sample information, and equipment status.
Regularly perform equipment maintenance (such as replacing X-ray tube oil, calibrating detectors).