Radiology

Fields of Radiology

• Nuclear Medicine Imaging
• Positron Emission Tomography

Both fields involve tracers. A tracer is a radioactive isotope that can be viewed by an x-ray.

Both fields we will be talking about involve tracers.

Most common Tracers

• Iodine - 123
• Iodine - 131
• Thallium - 201
• Gallium - 67 
• Indium - 111

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USes for tracers

• Kidney Function
• Cancer diagnosis
• Thyroid issues
• Heart Function

Half life Of tracers

• Iodine - 123 -13 hours
• Iodine - 131- 8 days
• Thallium - 201- 3 days
• Gallium - 67- 3 days
• Indium - 111- 2.8 days

Iodine - 123

• First administered as 50 mCi. 
• After 13 hours it reduces to 25 mCi.
• After 26 hours we are left with 12.5 mCi.
• Finally at 39 hours we have the minimal amount of 6.25 mCi.

Thank you