Thyroid

Question 1

2 Most common tracers for parathyroid scans?

Answer 1

TECH99-M MIBI or TETRO

Question 2

Primary hyperparathyroidism is caused by what 3 things and what percentage of causes with each?

Answer 2

Parathyroid Adenoma (85-90%), Hyperplasia (10%) and Parathyroid carcinoma (<1%)

Question 3

Dual isotope scanning can be done to differentiate thyroid from parathyroid. Name the 2 tracers….

Answer 3

Tech 99M MIBI and I-123 (thyroid)

Question 4

Most common cause of hyperthyroidism is?

Answer 4

Graves.

Question 5

Differentiating graves from toxic multinodular goiter?

Answer 5

Graves is diffuse tracer uptake , toxic multinodular goiter is heterogenous

Question 6

What is the main differentiating factor between graves and subacute thyroiditis?

Answer 6

Graves has very high RAIU, whereas Subacute Thyroiditis is low RAIU (usually <3%)

Question 7

After tech 99 m is eluted what does compound is in the “kit” that allows it to be reduced so it can therefore bind in the body?

Answer 7

Chloride 10- binds more avidly to the oxygen molecules on the t-99m and allows it to be reduced….where it can then therefor bind in the body.