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Photon-Counting Detector CT for Lenticulostriate Arteries: Comparison with Energy-Integrating Detector CT and
Wentian Tang1, Wenjing Li1, Yane Zhao1
1From the Department of Radiology (W.T., W.L., Y.Z., D.J., S.L., G.L.), Geriatric Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China.
Background And Purpose:
Lenticulostriate arteries (LSAs) are micro but clinically critical perforating vessels that remain difficult to visualize using conventional techniques. This study aimed to conduct a preliminary comparison of the visualization of LSAs in head and neck CTA with photon-counting detector CT (PCD-CT) with 4 reconstruction modes.
Materials And Methods:
This retrospective study included patients who underwent head and neck CTA with PCD-CT between January 2024 and May 2024 and those who underwent CTA with energy-integrating detector CT (EID-CT) between September 2023 and May 2024. The images were reconstructed in 4 modes for the PCD-CT group and 1 mode for the EID-CT group. The image quality was evaluated, and the LSAs were visualized by using subjective evaluations and quantitative assessments. The Friedman test was used to compare the characteristics of the 4 reconstruction modes.
Results:
The PCD-CT group comprised 56 patients (average age 65 ± 14 years; 28 men), and the EID-CT group comprised 28 patients (average age, 64 ± 12 years; 14 men). In the PCD-CT group, the 0.2-mm slice-thickness threshold 3D mode displayed the highest counts of LSAs (right side: 4.00 [range, 3.00-4.00]; left side: 4.00 [range, 3.00-4.00]) and the longest LSAs (right side: 23.33 ± 4.86 mm; left side: 24.18 ± 4.51 mm). The 0.4-mm slice-thickness vascular spectral postprocessing mode obtained higher subjective evaluation scores. Furthermore, the PCD-CT group exhibited a higher count of LSAs, longer LSA lengths, and superior image quality than the EID-CT group.
Conclusions:
PCD-CT achieves better visualization of LSAs and image quality than EID-CT and therefore constitutes an important method for observing LSAs in the future.
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