TU-E-217BCD-02: An X-Ray Scatter Correction Method for Dedicated Breast Computed Tomography.

Area of Science:

• Medical Imaging
• Radiology
• Image Processing

Background:

• X-ray scatter in breast computed tomography (BCT) degrades image quality, causing artifacts and inaccuracies.
• Scatter reduces contrast and homogeneity, hindering accurate diagnosis.

Purpose of the Study:

• To develop and evaluate an algorithm for reducing X-ray scatter in BCT images.
• To improve image quality and quantitative accuracy in BCT without increasing patient dose.

Main Methods:

• Acquired additional BCT projections using a tungsten plate with perforations to create pencil beams.
• Estimated scatter by comparing plate projections with standard projections, then interpolated for whole-image correction.
• Subtracted estimated scatter from standard projections, reconstructed images, and applied noise filtering.

Main Results:

• Pencil beams provided an excellent estimate of the primary-only signal (max 2.2% scatter).
• Additional projections added only 0.4% to the glandular dose.
• Algorithm improved image homogeneity, tissue contrast, reconstruction accuracy, and contrast-to-noise ratios.

Conclusions:

• The proposed algorithm effectively reduces X-ray scatter in BCT.
• This method significantly enhances BCT image quality with negligible additional radiation exposure.