Photon-counting detectors in computed tomography: from quantum physics to clinical practice

Area of Science:

• Medical Imaging
• Radiology
• Detector Technology

Background:

• Conventional energy-integrating detectors are standard in computed tomography (CT).
• A new generation of photon-counting detectors (PCDs) has emerged, offering superior performance in preclinical evaluations.
• PCDs are poised to transition into clinical practice.

Purpose of the Study:

• To introduce the technical principles of photon-counting CT detectors.
• To compare PCDs with conventional energy-integrating detectors.
• To showcase the potential of whole-body photon-counting CT in clinical settings.

Main Methods:

• Demonstration of the technical principles behind photon-counting detector technology.
• Acquisition of phantom and patient images using a whole-body photon-counting CT scanner.
• Comparative analysis referencing conventional energy-integrating detectors.

Main Results:

• Photon-counting detectors can discriminate single photons and quantify their energy.
• Potential benefits include improved radiation dose efficiency, enhanced contrast-to-noise ratio, and reduced metal artifacts.
• Advanced capabilities such as simultaneous multi-energy acquisitions and multi-phase imaging with multiple contrast agents are possible.

Conclusions:

• Photon-counting CT represents a significant advancement in medical imaging technology.
• The technology offers substantial improvements over conventional CT detectors.
• Photon-counting CT holds considerable promise for the future of clinical radiology and patient care.