Iterative reconstruction improves image quality and reduces radiation dose in trauma protocols; A human cadaver study

Area of Science:

• Radiology
• Medical Imaging
• Radiation Oncology

Background:

• Radiation exposure from CT scans is a concern for young trauma patients.
• Iterative reconstruction (IR) and split-bolus techniques are emerging methods to reduce radiation dose.
• Assessing image quality with these new techniques is crucial.

Purpose of the Study:

• To compare the image quality of thoracoabdominal CT scans in human cadavers using IR and standard filtered back-projection (FBP).
• To evaluate image quality at varying radiation dose levels.

Main Methods:

• Ten cadavers underwent CT scans at full dose and two reduced dose levels (5 mGy and 7.5 mGy CTDIvol).
• Images were reconstructed using FBP and Sinogram Affirmed Iterative Reconstruction (SAFIRE) levels 2 and 4.
• Quantitative (CNR, SNR) and qualitative (VGR) image quality assessments were performed.

Main Results:

• Radiologists preferred SAFIRE images over FBP at dose reductions of 40% and 56%.
• SAFIRE reconstruction showed significant improvements in CNR and SNR compared to FBP at both low-dose levels.
• Overall image quality was significantly better with SAFIRE.

Conclusions:

• SAFIRE (levels 2 and 4) provides equal or better image quality than FBP at reduced radiation doses (up to 56% reduction).
• IR, specifically SAFIRE, is a promising tool for radiation dose reduction in young trauma patients undergoing CT.
• This technique can help mitigate radiation-related cancer risks in this population.