Single-shot quantitative x-ray imaging using a primary modulator and dual-layer detector

Area of Science:

• Medical Imaging
• Radiological Physics
• Quantitative Imaging

Background:

• Conventional X-ray imaging faces quantitation challenges like scatter, beam hardening, and tissue overlap.
• Dual-energy (DE) imaging offers material quantitation but requires precise alignment and scatter correction.

Purpose of the Study:

• Propose single-shot quantitative imaging (SSQI) using a primary modulator (PM) and dual-layer (DL) detector.
• Enable motion-free DE imaging with simultaneous scatter and beam hardening correction in one exposure.

Main Methods:

• SSQI algorithm simultaneously recovers material and scatter images using four sub-measurements from PM encoding.
• Validated using simulations, phantom studies (acrylic, copper, anthropomorphic chest), and a dynamic flow phantom with iodine contrast.

Main Results:

• SSQI achieved accurate scatter correction and material decomposition (MD) in simulations.
• Phantom studies showed low RMSE for material estimation (0.13 cm acrylic, 0.04 mm copper).
• SSQI improved MD accuracy in anthropomorphic phantoms (38%-92% RMSE reduction) and enabled dynamic quantitative imaging.

Conclusions:

• SSQI demonstrates potential for robust quantitative X-ray imaging.
• Straightforward integration with PM and DL detector facilitates adoption in radiography and dynamic imaging applications.