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Simultaneous scatter rejection and correction method using 2D antiscatter grids for CBCT.

Zhelin Yu1, Yeonok Park2, Cem Altunbas2

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|April 22, 2020
PubMed
Summary
This summary is machine-generated.

A novel grid-based scatter sampling (GSS) method uses the 2D antiscatter grid to measure and correct residual scatter in Cone Beam Computed Tomography (CBCT). This technique reduces ring artifacts and improves CT number accuracy without extra hardware.

Keywords:
CBCTantiscatter gridflat panel detectorsscatter correction

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Area of Science:

  • Medical Imaging
  • Radiological Physics
  • Image Processing

Background:

  • Two-dimensional antiscatter grids (2D grids) in Cone Beam Computed Tomography (CBCT) reduce scatter but allow residual scatter transmission.
  • Residual scatter degrades CT number accuracy and causes artifacts, particularly ring artifacts from grid septal shadows.
  • Existing methods for scatter correction may require additional hardware or are insufficient for residual scatter.

Purpose of the Study:

  • To introduce and validate a novel grid-based scatter sampling (GSS) method for correcting residual scatter in CBCT.
  • To leverage the 2D antiscatter grid itself as a device for measuring residual scatter.
  • To assess the impact of GSS on artifact reduction and CT number accuracy in CBCT images.

Main Methods:

  • The GSS method exploits the spatial modulation of primary x-ray fluence by the 2D grid's septal shadows to measure residual scatter.
  • The variation in the signal modulation pattern directly correlates with residual scatter intensity.
  • Residual scatter is quantified for each detector pixel and subtracted from the projection data.

Main Results:

  • CBCT imaging experiments demonstrated successful reduction of ring artifacts caused by the 2D grid's footprint.
  • Image noise was reduced by 23% due to artifact suppression.
  • Hounsfield Unit (HU) nonuniformity in water-equivalent sections decreased from 20 HU to 10 HU, and streak artifacts were reduced.
  • Phantom size-dependent variations in HU were mitigated, with average HU reduction decreasing from 9% to 5% when increasing phantom size from head to pelvis.

Conclusions:

  • The GSS method effectively corrects residual scatter transmitted through 2D antiscatter grids in CBCT.
  • This technique enhances the scatter suppression capabilities of 2D grids without requiring additional measurement hardware.
  • GSS significantly improves CT number accuracy and reduces artifacts, complementing existing scatter correction strategies.