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A moving blocker system for cone-beam computed tomography scatter correction.

Luo Ouyang¹, Kwang Song, Jing Wang

¹Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas 75235, USA.

Medical Physics

|July 5, 2013

Summary

This study experimentally validates a moving-blocker system for cone-beam computed tomography (CBCT) scatter correction. The novel approach effectively reduces scatter-induced artifacts, improving image quality in a single scan.

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Area of Science:

Medical Imaging
Radiological Physics
Image Reconstruction

Background:

Scatter contamination in cone-beam computed tomography (CBCT) significantly degrades image quality, causing shading artifacts.
Accurate scatter estimation and correction are crucial for reliable CBCT imaging.
Previous simulation studies suggested a moving-blocker approach for simultaneous scatter estimation and reconstruction.

Purpose of the Study:

To experimentally demonstrate the effectiveness of a moving-blocker-based scatter correction technique for kV CBCT systems.
To implement and evaluate a moving blocker system on a LINAC on-board kV CBCT imaging system.
To assess the system's capability for simultaneous scatter estimation and complete volumetric reconstruction within the field of view (FOV).

Main Methods:

A physical attenuator with lead strips was mounted on a linear actuator driven by a step motor.
The blocker moved along the gantry rotation axis during CBCT acquisition to estimate scatter signals in blocked regions.
Scatter signals were interpolated into unblocked regions, and a statistics-based iterative algorithm reconstructed images after scatter subtraction.

Main Results:

The moving blocker system substantially reduced scatter-induced shading artifacts in CBCT images.
CT number errors in phantoms decreased significantly: from 318 to 17 (Catphan) and 239 to 10 (pelvis phantom).
The system successfully acquired complete volumetric information within the FOV in a single scan.

Conclusions:

Experimental validation confirms the moving blocker system's efficacy in scatter signal estimation.
The implemented system successfully corrects scatter artifacts in kV CBCT imaging.
This technique enables complete volumetric reconstruction within the FOV from a single CBCT scan.