Multilayer and crushed stent visualization using photon- counting detector computed tomography - a proof of concept.

Area of Science:

• Medical Imaging
• Radiology
• Cardiovascular Technology

Background:

• Coronary stenting is crucial for treating coronary artery disease.
• Standard-resolution CT (SR-CT) has limitations in visualizing complex stent configurations.
• Photon-counting detector CT (PCD-CT) offers ultra-high resolution (UHR) for potential imaging improvements.

Purpose of the Study:

• To compare the performance of UHR PCD-CT versus SR-CT in visualizing coronary stents.
• To evaluate the impact of different stenting techniques (single-layer, crushed, multi-layer) on image quality.
• To assess objective and subjective image quality metrics.

Main Methods:

• An ex-vivo phantom heart model simulating physiological attenuation was used.
• Common coronary bifurcation stenting techniques were replicated, including single-layer, crushed, and multi-layer stents.
• UHR and SR PCD-CT were compared using Bv72 and Bv56 kernels, analyzing in-stent lumen visibility, SNR, and stent attenuation.
• Subjective image quality was rated using a 5-point Likert scale.

Main Results:

• UHR PCD-CT with Bv72 significantly improved in-stent lumen visibility in pooled crush cohorts compared to SR PCD-CT (p < 0.01).
• This improvement was more pronounced in smaller stents.
• UHR imaging demonstrated better sharpness and reduced blooming artifacts compared to SR imaging, particularly with the Bv72 kernel (p ≤ 0.01).

Conclusions:

• UHR PCD-CT, especially with the Bv72 kernel, shows potential for assessing complex coronary stents in phantom models.
• The enhanced visualization capabilities may lead to improved diagnostic accuracy in cardiovascular imaging.
• Further clinical studies are warranted to validate these findings in patient populations.