CT Technology

Inspection Mode

1)Cone-beam CT

The Cone-beam CT system operates by capturing projection images as the object rotates a full 360°between an X-ray source and detector.This technique produces high-definition 3D volumetric images within the field of view(FOV)in a single rotation.This methodology is particularly valuable in medical imaging where rapid,low-radiation scans are essential,as well as in industrial applications.

However,unlike Fan-beam CT,Cone-beam CT lacks theoretical precision in its algorithmic approach.The error margin increases with larger cone angles(greater vertical distance from the rotation center axis),resulting in what's known as Cone-beam Artifacts.

Through extensive research into various artifact elimination methods,we've developed an advanced algorithm that significantly reduces Cone-beam Artifacts.Our testing with a ball phantom at a 30°cone angle demonstrates substantial artifact reduction compared to standard reconstruction methods.

2)Fan-beam CT

Similar to Cone-beam CT,this technique reconstructs images from 360°projection data,but with a key difference：it produces single-slice tomographic images rather than complete 3D volumes in one rotation.While this method offers superior theoretical accuracy and produces precise images without scanning-related errors,especially when using appropriate collimation to minimize scatter effects,it requires multiple rotations for full 3D reconstruction.This results in longer scanning times compared to Cone-beam CT,though Helical Scan implementation can help reduce this duration.

3)Laminography(Tomosynthesis)

Tomosynthesis represents a unique approach to 3D imaging,utilizing limited-angle projections rather than complete CT rotation.While its origins date to the 1930s,it saw renewed interest with the advent of Fast Digital FPD and enhanced computing capabilities.The technique offers six distinct scanning geometries.

This method excels in rapid scanning and is particularly effective for thin,expansive objects that prove challenging for conventional CT.However,due to its limited-angle nature,achieving CT-equivalent 3D quality remains challenging.Optimal reconstruction quality is achieved only within specific zones of the scanning field.

4)Helical(Spiral)CT

Helical CT,which gained prominence in the early 1990s,evolved from single-slice CT to Multi-Detector CT(MDCT),incorporating multiple detector lines(2 to 320)per rotation.This advancement offers rapid scanning speeds while maintaining reconstruction accuracy,making it especially valuable for examining objects exceeding standard FOV dimensions.

5)Offset Scan

This innovative technique enables examination of objects larger than the standard FOV by minimizing data overlap during 360°rotation.While theoretical FOV expansion of 200%isn't achievable due to algorithmic constraints,practical implementations achieve 180-190%expansion through specialized processing algorithms.

6)Half Scan

Half Scan optimizes the scanning process by utilizing 180°plus a small additional angle,rather than a complete 360°rotation.This technique requires sophisticated algorithms to normalize the varying ray usage across the reconstruction volume.

Artifact Reduction

1)Beam Hardening

Beam hardening artifacts arise from the multi-energy nature of X-ray photons,contrasting with the single-energy assumption in CT reconstruction models.Higher-energy photons demonstrate greater material penetration,leading to increased effective X-ray energy during material traversal.

2)Metal Artifacts Reduction

Metal artifacts,particularly problematic in industrial CT,result from beam hardening and scatter effects in high-density materials.Our research implements various advanced techniques,including Statistical Iterative Reconstruction and 2-Pass repetitive reconstruction algorithms,to effectively minimize these artifacts.