Low-dose computed tomographic urography using adaptive iterative dose reduction 3-dimensional: comparison with...

Area of Science:

• Radiology
• Medical Imaging

Background:

• Computed tomographic (CT) urography is essential for evaluating the urinary system.
• Reducing radiation dose in CT scans is a priority to minimize patient risk.
• Adaptive iterative dose reduction 3D (AIDR 3D) is a reconstruction technique aimed at lowering radiation exposure.

Purpose of the Study:

• To compare the image quality of low-dose CT urography using AIDR 3D with routine-dose CT urography using filtered back projection (FBP).
• To assess the diagnostic acceptability and radiation dose reduction achieved with AIDR 3D.

Main Methods:

• Thirty patients underwent both low-dose CT with AIDR 3D and routine-dose CT with FBP for urography.
• Quantitative analysis measured image noise in various anatomical regions.
• Qualitative analysis assessed diagnostic acceptability of the urinary system, considering patient BMI.

Main Results:

• Low-dose CT with AIDR 3D demonstrated lower image noise compared to routine-dose CT with FBP.
• No significant differences in diagnostic acceptability were found between the two techniques across all urinary systems.
• Routine-dose CT yielded an average CTDIvol of 14.5 mGy (nephrographic) and 9.2 mGy (excretory), while low-dose CT yielded 4.2 mGy and 2.7 mGy, respectively.

Conclusions:

• Low-dose CT urography utilizing AIDR 3D achieves diagnostic image quality comparable to routine-dose CT.
• This approach offers a substantial radiation dose reduction of approximately 70%.