Radiation Dose Reduction in Head and Neck Computed Tomography Angiography

Area of Science:

• Radiology
• Medical Imaging
• Radiation Oncology

Background:

• Head and neck computed tomography angiography (CTA) involves radiation exposure.
• Optimizing radiation dose while maintaining diagnostic image quality is crucial.

Purpose of the Study:

• To evaluate the feasibility of further reducing radiation dose in head and neck CTA.
• To assess the impact of high iodine delivery rate and automatic current modulation on radiation dose and image quality.

Main Methods:

• A randomized study involving 64 patients undergoing head and neck CTA.
• Patients were divided into a low-dose group and an ultra-low-dose group.
• Image quality and radiation dose parameters (CTDIvol, DLP, effective dose) were analyzed using adaptive statistical iterative reconstruction.

Main Results:

• The ultra-low-dose group showed a significant reduction in radiation dose parameters (CTDIvol, DLP, effective dose) compared to the low-dose group (P<0.001).
• Quantitative and qualitative image quality assessments were similar between the groups.
• Higher mean vascular CT values were observed in the ultra-low-dose group.

Conclusions:

• Combining a high iodine delivery rate with automatic current modulation (high noise index) in low tube voltage protocols can further decrease radiation dose in head and neck CTA.
• This method allows for reduced contrast agent volume while preserving diagnostic image quality.
• This approach is recommended as a conventional scanning method for head and neck CTA.