Low-dose ultra-high-resolution temporal bone imaging using Sn100 kVp photon-counting CT: A comparative study with...

Area of Science:

• Medical Imaging
• Radiology
• Computed Tomography

Background:

• Conventional energy-integrating detector CT (EID-CT) is standard for temporal bone imaging.
• Optimizing radiation dose while maintaining or improving image quality remains a key challenge.

Purpose of the Study:

• To evaluate the clinical impact of low-dose photon-counting detector CT (PCD-CT) using 100 kVp tin filtration (Sn100 kVp).
• To compare radiation dose and image quality of PCD-CT against conventional EID-CT for temporal bone imaging.

Main Methods:

• Prospective enrollment of patients with suspected temporal bone lesions.
• Comparison of PCD-CT scans (Sn100 kVp, 0.2 mm and 0.6 mm reconstructions) with retrospective EID-CT scans (120 kVp, 0.6 mm reconstruction).
• Quantitative (attenuation, noise, SNR, CNR) and qualitative assessments of image quality and radiation dose.

Main Results:

• PCD-CT achieved a 53% reduction in effective radiation dose compared to EID-CT (0.35 vs. 0.75 mSv).
• PCD-CT demonstrated significantly lower image noise and higher contrast-to-noise ratio (CNR) for key structures.
• Both PCD reconstructions were qualitatively preferred over EID-CT for anatomical visualization and overall image quality.

Conclusions:

• Low-dose Sn100 kVp PCD-CT offers a significant dose reduction (53%) and improved image quality over conventional EID-CT.
• Ultra-thin 0.2 mm reconstructions with PCD-CT leverage high spatial resolution for superior depiction of fine temporal bone details.