Image quality and dose reduction with photon counting detector CT: Comparison between ultra-high resolution mode and...

Area of Science:

• Medical Imaging
• Radiology
• Computed Tomography

Background:

• Photon-counting detector computed tomography (PCCT) offers advanced imaging capabilities.
• Assessing novel modes like ultra-high resolution (UHR) is crucial for optimizing clinical utility.

Purpose of the Study:

• To evaluate image quality and dose reduction potential of UHR mode versus standard mode on a commercial PCCT scanner.

Main Methods:

• Phantom scans were performed using UHR and standard modes at varying dose levels (3/6/12 mGy).
• Noise power spectrum (NPS), task-based transfer function (TTF), and detectability indexes (d') were analyzed.
• Reconstruction kernels (Br36, Br68) and slice thickness (0.4 mm) were utilized.

Main Results:

• UHR mode demonstrated lower noise magnitude and texture across all dose levels compared to standard mode.
• Spatial resolution (f50) was comparable for soft tissue and improved for bone/iodine with UHR.
• UHR mode significantly increased lesion detectability (d') with potential dose reductions of up to 68.7% for bone lesions.

Conclusions:

• UHR mode on PCCT provides superior image quality with reduced noise and enhanced lesion detection.
• The findings support UHR mode's potential for significant radiation dose reduction in clinical PCCT applications.