Thyroid Imaging with 123I

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What is the advantage of using 123I in thyroid imaging?

No advantages over 131I

Particulate radiation and low image resolution

Higher radiation dose to the patient

Well-resolved images and low radiation dose to the patient (correct)

What is the purpose of thyroid imaging using 123I?

To determine the presence of thyroid tissue in the lung

To determine the presence of thyroid tissue in the brain

To determine the relative function of nodules in the thyroid gland (correct)

To determine the presence of thyroid tissue in the liver

What is the recommended time to start scanning after the administration of 123I?

Immediately after administration

1 hour after administration

4 to 24 hours after administration (correct)

20 minutes after administration

What can affect the uptake of 123I in thyroid imaging?

Thyroid medication and certain foods Signup and view all the answers

What is the adult dose of 99m Tc pertechnetate administered intravenously?

5 mCi (185 MBq) Signup and view all the answers

What type of collimator is used in thyroid imaging?

Pinhole collimator Signup and view all the answers

What is the primary purpose of measuring 131I uptake in the thyroid gland?

To estimate the function of the thyroid gland Signup and view all the answers

What is the dose of 131I sodium iodide administered orally for a standard uptake test in adults?

3 to 5 μCi (148 to 222 kBq) of 131I Signup and view all the answers

What is the significance of a higher uptake of 131I in the thyroid gland?

It indicates a more active thyroid gland Signup and view all the answers

What is the purpose of comparing the patient's total count with the standard count in 131I uptake measurement?

To obtain the patient percent uptake Signup and view all the answers

What is the role of 131I uptake measurement in patients with Graves disease?

To determine the appropriateness of a therapeutic dose of 131I Signup and view all the answers

What is the significance of a lower uptake of 131I in the thyroid gland?

It indicates a less functional thyroid gland Signup and view all the answers

What is the advantage of using positron-emitting radionuclides in nuclear medicine studies?

They can directly replace their stable isotopes in substrates, metabolites, drugs, and other biologically active compounds Signup and view all the answers

What is the current emphasis of nuclear medicine studies?

Function and chemistry Signup and view all the answers

What was the significant development in PET imaging beginning in 2000?

The development of combined PET and CT systems Signup and view all the answers

What is the benefit of using CT in combination with PET or SPECT?

Anatomic registration and improved attenuation correction Signup and view all the answers

What is the expected benefit of using combined PET and CT systems for diagnosing metastatic disease?

Precise localization of tumor site and function Signup and view all the answers

What is the relevance of hypothyroidism in the context of nuclear medicine?

It is a condition that can be diagnosed using nuclear medicine Signup and view all the answers