TomoShop®, X-ray CT reconstruction software with artifact reduction tools (ring artifact, metal artifact, cupping artifact, etc) 2D/3D viewer, measurement functions & functions for connecting from CT to 3D printing, rapid prototyping etc.

Problem cases with X-ray CT scan

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Problem cases with the reconstruction images of X-ray CT scan and the solution

Case 1: The problem that sample does not fit into the camera (Cupping Artifact)

cuppingEffet1

In this issue, it is a possibility that the periphery of the horizontal cross section of the reconstructed image becomes brighter. (Cupping effect)

Then,

Troubles occur in 3D display as well as conducting measurement and analysis. The solution for this problem is using the algorithm of the CT reconstruction software to reduce or delete cupping artifact.

As you can see the images of the left, TomoShop® can solve cupping effect.

See ☞ Cupping artifact reduction page.

See ☞ CT reconstruction software: TomoShop® page.

 

Case 2: Variability problem of camera element sensitivity (Ring Artifact, Vertical Artifact)

When there are problems that variations of camera element sensitivity, then ring artifacts will occur. Troubles occur in 3D display as well as conducting measurement and analysis.

The recommended solutions for this problem are:

  • Conduct CT scan with stronger tube voltage.
  • Examine whether there is a problem with the input element of the camera.
  • Use special tools of the CT reconstruction software to reduce the ring/vertical artifacts. etc

As you can see the below, TomoShop® can reduce ring artifacts and output clean and better reconstruction image.

ring_b4aftercollection_ballpen

Before correction

After correction

Vertical artifacts also occur with the problem that variations of camera element sensitivity. Troubles occur in 3D display as well as conducting measurement and analysis.
As you can see the below, TomoShop® can reduce vertical artifacts and output clean and better reconstruction image.

ring_orignal_yz

ring_vert_yz

Before correction

After correction

See ☞ Ring artifact reduction page.

See ☞ CT reconstruction software: TomoShop® page.

 

Case 3: Incomplete problem of circular orbit (Axial Intensity Drop)

Incomplete problem of circular orbit will cause Axial Intensity Drop. TomoShop® has three ways to solve it.

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Case 4: Polychromatic problem of X-ray (Cupping Artifact)

Beam hardening is caused by a polychromatic problem of X-ray. Troubles occur in 3D display as well as conducting measurement and analysis. The recommended solution is using the special tools of the CT reconstruction software to reduce cupping artifact.

TomoShop® will solve this problem. (Cupping effect/Cupping artifact)

BH_no

Ordinal Method with no correction

cuppingeffect_no_russiandoll_graph


BH_yes

TomoShop®’s Method with correction

cuppingeffect_yes_russiandoll_graph

Consideration on a method of CT scanning for beam-hardening (cupping effect) reduction:

The one of the common method for beam-hardening reduction is using metal filters with adjustment of X-ray current. In this case, metals with low permeability such as copper, lead, etc. are commonly used. In this case, it uses only X-rays with strong energy and block X-rays with low energy, and it seems that there is some effect to reduce the beam-hardening (cupping effect) of metal parts.

However, this method also has problems. It is effective for metal parts susceptible to beam-hardening because it removes X-ray with weak energy of continuous X-rays and uses only high-energy X-rays. but the shape of soft parts other than metals can not be reproduce beautifully.

As a countermeasure, it is conceivable to change the type of metal filter to a metal with a relatively high transmittance of relatively weak X-rays such as aluminum. Ideally, CT scanning may be performed X-rays include with X-rays with low energy and beam-hardening problem should be manage to solve by using CT software’s function.

TomoShop has functions for doing beam-hardening reduction, so it is possible to provide an ideal solution for the beam-hardening (cupping effect) reduction.

See ☞ Cupping artifact reduction page.

See ☞ CT reconstruction software: TomoShop® page.

 

Case 5: The problem that X-ray is not transmitted (Metal Artifact)

Metal artifacts will occur by the X-ray can not be transmitted.

The recommendation solutions are:

  • CT scan with stronger tube voltage.
  • Use the artifact reduction tools of CT reconstruction software to reduce metal artifact. etc

TomoShop® has the metal reduction tools that will strongly reduce the metal artifacts.

BH修正‗無しf

BH修正‗有りf

Before Correction

After Correction

Metal artifacts_before1

Metal artifacts_after1

See ☞ Metal artifact reduction page.

See ☞ CT reconstruction software: TomoShop® page.

 

Case 6: Rotation axis and camera center, displacement of the problem of orientation

Blur image problems will occur in the 3D image reconstructed by the rotation axis and the camera center and the direction of displacement of the problem. This can be corrected by automatic and semi-automatic by TomoShop®.

focusing_no

focusing_yes

Before Correction

After Correction

See ☞ Focusing Technology page.

See ☞ CT reconstruction software: TomoShop® page.

 

Case 7: Focus movement problem of stage rotation error and the rotation pass is not circle

Reconstruction in the conventional method is impossible because of the focus shift problem with shooting trajectory of stage rotation error and the rotation pass is not circle. TomoShop® can solve this problem.

focusing_comparison

See ☞ Focusing Technology page.

See ☞ CT reconstruction software: TomoShop® page.

 

Please feel free to inquire.

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