Experimental evaluation of dual Multiple Aperture Devices for Fluence Field Modulated X-Ray Computed Tomography

Area of Science:

• Medical Imaging
• Physics

Background:

• Current CT scanners use static bowtie filters and tube-current modulation, limiting adaptive capabilities for patient morphology.
• Hardware-based fluence-field modulation offers potential for lower radiation exposure in CT imaging.

Purpose of the Study:

• To present the first experimental evaluation of a novel fluence-field modulation strategy using a dual-Multiple Aperture Devices (MADs) system.
• To demonstrate the efficacy of dual-MAD systems for generating diverse fluence patterns and improving CT imaging.

Main Methods:

• Utilized two MAD devices, which are fine-scale binary filters, in series to create numerous fluence patterns through small relative motions.
• Experimental evaluation involved characterizing achievable fluence patterns and investigating projection data acquired with the dual-MAD system.

Main Results:

• The dual-MAD system demonstrated the capability to generate a large number of distinct fluence patterns.
• Experimental data confirmed the potential of this technique for CT imaging applications.

Conclusions:

• The novel dual-MAD system represents a significant advancement in hardware-based fluence-field modulation for CT.
• This technique shows promise for enabling lower radiation dose CT imaging and new imaging applications.