Nuclear Medicine - Thyroid Whole Body

What is a Thyroid Whole Body Scan?

A Thyroid Whole Body Scan is a diagnostic exam for the detection of metastatic thyroid cancer using a small radioactive iodine capsule of I-131 or I-123 or an injection of TI-201.

Indication

  • History of Papillary Thyroid Cancer
  • History of Follicular Thyroid Cancer

Preparation

Preparation depends on if the patient is getting Thyrogen injections.

  • I-131 or I-123 without Thyrogen
    • No thyroid medication for 4-6 weeks 
    • TSH levels must be over 30 
    • Low iodine diet for 2-4 weeks 
    • No seafood (sushi, kelp) or medication with iodine 2 weeks prior to exam 
    • No CT or IVP 4 weeks prior to exam
  • I-131 or I-123 with Thyrogen 
    • 2 Thyrogen injections 1-2 days prior to exam 
    • TSH levels must be over 30 
    • Low iodine diet for 2-4 weeks 
    • No seafood or medication with iodine 2 weeks prior to exam
  • TI-201 injection is used when the I-131 or I-123 exam are negative but the indication of disease is high 
    • None needed

Expectation

  • I-131 with or without Thyrogen
    • You will be in the department for 2-5 minutes to receive a capsule of I-131 
    • You will return 48 hours to 96 hour after dosing for images 
    • Images will take 30 minutes from head to mid thigh
  • I-123 with our without thyrogen 
    • You will be in the department for 2-5 minutes to receive 5-12 capsules of I-123 
    • You will return 24 hours to 48 hours after dosing for images 
    • Images will take 30 minutes from head to mid thigh
  • TI-201 
    • You will be in the department for 2-5 minutes for injection of Thallium 201 
    • You will return 2 to 6 hours after injection for images 
    • Images will take 30 minutes from head to mid thigh 
    • You may need to return 24 hours for delay imaging