🔄 Centering your sample

For Samples smaller than the FOV:

GTS Rotation 0°
Draw annotation circle same size as sample/feature of interest.
Configure to be at Y 1280 and X 1080.
Move sample/feature using X step to recover it in the centre of circle.
GTS Rotation 90
Move sample/feature using Z step to recover it in the centre of the circle.
Check positions at 180 and 270 and with full rotation (0-360) to ensure feature remains centered.

GTS Rotation 0°
Draw annotation circle same size as sample/feature of interest.
Configure to be at Y 1280 and X 1080.
Move sample/feature using X step to recover it in the centre of circle.
GTS Rotation 90
Move sample/feature using Z step to recover it in the centre of the circle.
Check positions at 180 and 270 and with full rotation (0-360) to ensure feature remains centred.

For Samples larger than the FOV:

Mount sample on GTS
Set GTS Rotation to 0 degrees
Use GTS X to move the specimen until one side aligns with the edge of the FOV.
Record the GTS X position
Use GTS X to move the sample in the opposite direction until the other edge aligns with the FOV.
Record the 2nd GTS X Position.
Calculate the centre of these two points and enter the value into GTS X.
Set GTS Rotation to 90 degrees.
Repeat steps 3 to 7 using GTS Z motion.
Once sample is centred along X and Z axis the sample will be on the COR.

Optimising your imaging quality

No of projections is Pixel dimensions x π/2
Flat field ideally should be 35K count, contrast between brightest and darkest feature in sample should be around 20%
For stitching multiple tomography scans leave at least 10-20% overlap.

Image Guided Diffraction

Using reconstructed images to guide diffraction

Diffraction tomography