Radiation dose reduction in CT: application to tissue area and volume determination

Area of Science:

• Radiology and Medical Imaging
• Biomedical Engineering
• Quantitative Imaging

Background:

• Computed tomography (CT) is crucial for determining adipose and muscle tissue area and volume.
• Current CT protocols may involve higher radiation doses than necessary for specific applications like tissue quantification.
• Lower spatial resolution or higher image noise can be acceptable in certain CT applications, suggesting potential for dose reduction.

Purpose of the Study:

• To investigate the feasibility of reducing radiation dose during CT scans used for adipose and muscle tissue area and volume determination.
• To assess the impact of dose reduction on measurement accuracy and uncertainty in tissue quantification.
• To explore the potential for optimizing CT protocols for specific applications requiring less stringent image quality parameters.

Main Methods:

• In vivo measurements were conducted on a healthy male subject and in phantom studies using two standard clinical CT scanners.
• Tissue areas were quantified, and measurement uncertainties were systematically analyzed.
• Data were compared with simulated and theoretical datasets to validate findings.

Main Results:

• A 25-fold reduction in radiation dose was successfully achieved, resulting in an effective dose of 13 microSv per section.
• Measurement accuracy for tissue area remained high, exceeding 5% accuracy.
• The achieved dose savings closely aligned with theoretically possible reductions.

Conclusions:

• Significant radiation dose reduction is achievable for CT-based tissue area and volume determinations.
• Further dose reduction to approximately 1 microSv per section may be possible for this application.
• Modern CT technology offers substantial potential for dose reduction in specific clinical and research applications, facilitating large-scale studies.