Spatial dependency of multiplanar reconstruction in digital breast tomosynthesis

Area of Science:

• Medical Imaging
• Radiology
• Digital Breast Tomosynthesis

Background:

• Tomosynthesis exhibits anisotropic sampling in the Fourier domain, leading to spatially dependent image quality.
• The sampled Fourier space varies with object location, impacting reconstruction accuracy.

Purpose of the Study:

• To investigate the spatial dependency of image quality in tomosynthesis.
• To compare conventional tomosynthesis with a next-generation tomosynthesis (NGT) system regarding multiplanar reconstruction (MPR).

Main Methods:

• Utilized high-frequency star patterns and low-frequency octagon phantoms at various positions and obliquities.
• Analyzed reconstructions quantitatively (Fourier Sine Distortion - FSD) and qualitatively.
• Simulated low-contrast objects using water and acrylic beads to mimic breast tissue.

Main Results:

• Spatial dependency of MPR is influenced by tilt angle, orientation, and input frequency.
• NGT system demonstrated reduced out-of-plane artifacts compared to conventional tomosynthesis.
• Improved visualization of objects was observed with the NGT geometry.

Conclusions:

• The NGT system enhances spatial isotropy, leading to more consistent image quality across the field of view.
• NGT shows significant potential for reducing artifacts and improving diagnostic accuracy in tomosynthesis imaging.