Average radiation doses in a standard head examination for 250 CT systems

Area of Science:

• Medical Imaging
• Radiology
• Radiation Dosimetry

Background:

• Computed Tomography (CT) is a vital diagnostic tool.
• Accurate radiation dose assessment is crucial for patient safety and effective utilization of CT technology.
• Understanding dose variations in adult head CT procedures is essential for optimizing imaging protocols.

Purpose of the Study:

• To determine the average radiation dose for typical adult head CT procedures nationwide.
• To identify the range of Multiple Scan Average Dose (MSAD) in current clinical practice.
• To explore factors contributing to dose variability and potential for dose reduction.

Main Methods:

• A nationwide survey of approximately 250 computed tomography (CT) systems.
• Measurement and analysis of Multiple Scan Average Dose (MSAD) for adult head CT examinations.
• Comparison of dose levels across different manufacturers and scanner models.

Main Results:

• The MSAD for typical adult head CT procedures ranged from 2.2 to 6.8 rads (22-68 mGy).
• Dose variations exceeding a factor of two were observed even within the same manufacturer and model.
• Variability is attributed to user-selected techniques and inherent scanner performance differences.

Conclusions:

• Significant potential exists for radiation dose reduction in adult head CT by optimizing imaging techniques.
• Facilities should balance image quality with radiation dose when selecting CT protocols.
• Standardization of techniques and scanner performance evaluation can help minimize unnecessary radiation exposure.