Radiation dose to positron emission tomography technologists during quantitative versus qualitative studies

Area of Science:

• Medical Imaging
• Radiation Safety
• Nuclear Medicine Technology

Background:

• Positron emission tomography (PET) is a crucial diagnostic imaging technique.
• Technologists performing PET scans are occupationally exposed to ionizing radiation.
• Understanding radiation dose is essential for ensuring technologist safety.

Purpose of the Study:

• To quantify and compare radiation doses received by PET technologists during qualitative and quantitative imaging studies.
• To identify specific tasks contributing to technologist radiation exposure.
• To inform radiation safety protocols in PET imaging environments.

Main Methods:

• Thermoluminescent dosimeters (TLDs) were used to monitor radiation doses to technologists.
• Dose measurements were taken during both qualitative and quantitative PET studies.
• Radiation doses were recorded for specific tasks including dose drawing, injection, and blood sampling.

Main Results:

• Technologists received significantly higher radiation doses during quantitative studies (0.05 mSv shallow, 0.04 mSv deep) compared to qualitative studies (0.017 mSv shallow, 0.014 mSv deep).
• Blood sampling (0.016 mSv shallow, 0.014 mSv deep) and increased patient proximity during quantitative scans were major contributors to higher doses.
• Dose per study was approximately three times higher in quantitative procedures.

Conclusions:

• Quantitative PET studies pose a greater radiation risk to technologists than qualitative studies.
• Radiation safety measures should be enhanced, particularly focusing on blood sampling and time management during quantitative procedures.
• Regular monitoring and adherence to safety protocols are vital for minimizing occupational radiation exposure in PET technologists.