CT pulmonary angiogram with 60% dose reduction: Influence of iterative reconstructions on image quality

Area of Science:

• Radiology
• Medical Imaging

Background:

• Filtered back projection (FBP) is a standard reconstruction algorithm for CT.
• Iterative reconstruction techniques aim to improve image quality and reduce radiation dose.
• Sinogram affirmed iterative reconstruction (SAFIRE) is an advanced iterative reconstruction method.

Purpose of the Study:

• To compare the image quality of low-dose CT with SAFIRE to full-dose CT with FBP.
• To evaluate the impact of SAFIRE on noise reduction and lesion detection.
• To assess subjective image quality and noise perception.

Main Methods:

• Fifty pulmonary CT scans were acquired using a dual-source technique.
• Scans were reconstructed using both full-dose FBP (group 1) and low-dose SAFIRE (group 2).
• Objective noise measurements and subjective image quality assessments were performed.

Main Results:

• Low-dose SAFIRE images showed a significant objective reduction in noise.
• Subjective perception of noise and overall image quality were similar between groups.
• Image quality was rated excellent in 66% of SAFIRE cases.
• Detection of pulmonary lesions was not influenced by the dose reduction.

Conclusions:

• SAFIRE allows for a 60% reduction in radiation dose while maintaining excellent image quality.
• Iterative reconstruction with SAFIRE provides objectively superior image quality compared to FBP.
• Low-dose CT with SAFIRE is a viable alternative for pulmonary imaging.