Cone beam CT multisource configurations: evaluating image quality, scatter, and dose using phantom imaging and Monte...

Area of Science:

• Medical Imaging
• Radiological Physics
• Cone Beam CT Technology

Background:

• Cone beam CT (CBCT) is widely used in medical imaging, but image quality can be affected by scatter and dose.
• Multisource configurations offer potential improvements over traditional single-source CBCT.
• Optimizing multisource configurations is crucial for enhancing CBCT performance.

Purpose of the Study:

• To compare image quality, scatter, and dose across various multisource CBCT configurations.
• To evaluate overlapping versus collimated multisource x-ray tube designs.
• To assess performance using phantom imaging and Monte Carlo simulations.

Main Methods:

• Evaluated four x-ray tube configurations: single source, three-source overlapping, six-source overlapping, and six-source collimated.
• Assessed image quality using five phantoms on a prototype breast CT system.
• Quantified scatter contamination and radiation dose via Monte Carlo simulations.

Main Results:

• The six-source collimated configuration yielded 2.7X greater modulation than the six-source overlapping configuration.
• Collimated configurations recovered data lost due to cone beam artifacts, unlike overlapping configurations.
• Collimated configurations showed significantly lower scatter-to-primary ratios (0.26 vs. 0.81) and 4X less dose.

Conclusions:

• Collimated multisource CBCT configurations offer substantial improvements in image quality, scatter reduction, and dose efficiency.
• These findings highlight the advantages of collimated multisource designs over traditional single-source and overlapping multisource CBCT.
• The study demonstrates the potential of optimized multisource CBCT for enhanced diagnostic imaging.