High-Resolution Head CTA: A Prospective Patient Study Comparing Image Quality of Photon-Counting Detector CT and...

Area of Science:

• Medical Imaging
• Radiology
• Computed Tomography

Background:

• Photon-counting detector CT (PCD-CT) technology is now clinically available, enabling ultra-high-resolution (UHR) imaging capabilities.
• Traditional energy-integrating detector CT (EID-CT) has limitations in resolution and image quality for specific applications.

Purpose of the Study:

• To prospectively evaluate and compare the image quality of head CT angiography (CTA) acquired using PCD-CT versus EID-CT.
• To assess the impact of PCD-CT on diagnostic confidence for evaluating arterial findings in the head.

Main Methods:

• Adult patients underwent head CTA on both EID-CT and PCD-CT scanners.
• Images were reconstructed at standard resolution (SR) and ultra-high resolution (UHR) with a convolutional neural network (CNN) denoising algorithm for PCD-CT.
• Two blinded readers independently assessed image quality and diagnostic confidence.

Main Results:

• PCD-CT, particularly the PCD-UHR-CNN reconstruction, demonstrated significantly higher overall image quality compared to EID-CT.
• Depiction of arterial segments was superior with PCD-CT reconstructions.
• Diagnostic confidence for identifying arterial findings was substantially higher with PCD-CT (PCD-UHR-CNN: 88.6-93.0) than with EID-CT (70.4-78.2).

Conclusions:

• PCD-CT offers superior image quality for head CTA compared to EID-CT.
• The combination of PCD-UHR reconstruction and CNN denoising provides the most significant image quality enhancement.
• PCD-CT improves diagnostic confidence in the evaluation of cerebrovascular findings.