Optimizing Reconstruction Parameters for Detecting Peripheral In-Stent Restenosis with Photon-Counting Detector CT: A...

Area of Science:

• Medical Imaging
• Radiology
• Cardiovascular Imaging

Background:

• Accurate visualization of peripheral in-stent restenosis is crucial for patient management.
• Photon-counting detector CT (PCD-CT) technology offers potential improvements over conventional energy-integrated detector CT (EID-CT).

Purpose of the Study:

• To determine optimal reconstruction parameters for peripheral in-stent restenosis imaging using PCD-CT.
• To evaluate the superiority of PCD-CT over EID-CT for visualizing in-stent restenosis.

Main Methods:

• Peripheral stents with varying restenosis degrees were scanned using EID-CT and PCD-CT in a phantom study.
• PCD-CT data were acquired in standard-resolution (SR) and ultra-high-resolution (UHR) modes, reconstructed with various kernels and matrix sizes.
• Quantitative image quality metrics (noise, contrast, CNR) and qualitative reader assessments were performed.

Main Results:

• PCD-CT in SR mode at 40 keV virtual monoenergetic imaging (VMI) yielded the highest contrast and CNR, outperforming EID-CT and PCD-CT UHR.
• The Bv72 kernel with a 1024 matrix in PCD-CT SR mode was ranked highest by readers for detecting all degrees of restenosis.
• PCD-CT demonstrated superior image quality and detectability of restenosis compared to EID-CT.

Conclusions:

• PCD-CT in SR mode, utilizing 40 keV VMI, the Bv72 kernel, and a 1024 matrix, is optimal for peripheral in-stent restenosis visualization.
• PCD-CT offers significant advantages in image quality and restenosis detection compared to EID-CT.