Raw data-based iterative reconstruction in body CTA: evaluation of radiation dose saving potential

Area of Science:

• Radiology
• Medical Imaging
• CT Technology

Background:

• Filtered back projection (FBP) is a standard method for CT image reconstruction.
• Iterative reconstruction (IR) techniques offer potential for dose reduction and image quality improvement.
• Evaluating dose-saving potential of raw data-based IR in body CTA is crucial for patient safety.

Purpose of the Study:

• To prospectively assess the radiation dose reduction capabilities of raw data-based iterative reconstruction (SAFIRE) compared to FBP in body CT angiography (CTA).
• To evaluate the impact of SAFIRE on image quality, including noise and vessel sharpness, at reduced radiation doses.

Main Methods:

• Twenty-five patients undergoing thoraco-abdominal CTA were included.
• Images were reconstructed using full-dose FBP, half-dose FBP, and half-dose SAFIRE.
• Image quality, aortic contour sharpness, vessel attenuation, noise levels, and contrast-to-noise ratio were quantitatively and qualitatively assessed.

Main Results:

• Half-dose SAFIRE significantly reduced image noise (30.8% lower than half-dose FBP) and improved aortic contour sharpness compared to half-dose FBP.
• Image noise in half-dose SAFIRE was even lower (9.4%) than in full-dose FBP.
• Contrast-to-noise ratio was superior with SAFIRE compared to FBP at both full and half doses.

Conclusions:

• Raw data-based iterative reconstruction (SAFIRE) enables substantial radiation dose reduction (>50%) in body CTA while preserving or enhancing image quality.
• SAFIRE demonstrates superior noise reduction and improved vessel sharpness over FBP, even at reduced radiation levels.
• This technology holds significant promise for safer and more effective body CTA examinations.