Ultra-High-Resolution Photon-Counting CT Angiography for Noninvasive Detection of Neurovascular In-Stent Restenosis

Area of Science:

• Medical Imaging
• Radiology
• Cardiovascular Technology

Background:

• Noninvasive detection of neurovascular in-stent restenosis (ISR) is challenging due to artifacts and limited resolution in conventional computed tomography angiography (CTA).
• Ultra-high-resolution (UHR) photon-counting detector CTA (PCD-CTA) presents a potential solution to overcome these limitations.

Purpose of the Study:

• To evaluate the diagnostic performance of UHR PCD-CTA for detecting neurovascular ISR.
• To compare UHR PCD-CTA with simulated conventional CTA in terms of image quality and artifact reduction.

Main Methods:

• A prospective study enrolled patients with neurovascular stents, performing UHR PCD-CTA.
• Simulated energy-integrating detector CTA data were reconstructed for comparison.
• Two radiologists assessed image quality, diagnostic confidence, and visualization of intimal hyperplasia and plaque.

Main Results:

• UHR PCD-CTA showed significantly higher image quality and diagnostic confidence for ISR detection compared to simulated CTA.
• Marked reduction in blooming artifacts was observed with UHR PCD-CTA.
• Excellent diagnostic performance for ISR detection was achieved: 100.0% sensitivity, 97.3% specificity, and 98.0% accuracy.

Conclusions:

• UHR PCD-CTA demonstrates high diagnostic performance for noninvasive detection of neurovascular ISR.
• This advanced imaging technique shows promise as a tool for post-stent surveillance.