Ultra-high Resolution Photon Counting Detector Computed Tomography Imaging for Quantitative Lung Assessment

The UHRQ+ mode is recommended for quantitative lung assessment, leveraging the PCD-CT voxel size potential (1024×1024 in plane matrix with 0.2 mm slice thickness). The choice of reconstruction kernel at ultra-high resolution should be task-specific, with Qr40 being optimal for density assessment due to its accuracy in air measurement across regions and Br64 for airway assessment. The high consistency of measurements across the radiation dose levels for these kernels (<5% measurement change from 9 mGy measurements) suggests that acquisition at 3 mGy is sufficient for quantitative analysis.