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What is the purpose of septa in PET imaging?

To detect true coincidences

To produce positron emitters

To reduce random and scatter events from adjacent rings (correct)

To label deoxyglucose

What is the half-life of the main positron emitter used in PET imaging?

68 minutes

110 minutes (correct)

10 minutes

1 minute

What type of events can occur in PET imaging?

True, random, and scattered events (correct)

Only random coincidences

Only scattered events

Only true coincidences

Why are PET images fused with CT or MRI images?

To locate and visualise functional information within the patient’s anatomy Signup and view all the answers

What is the purpose of detectors in PET imaging?

To detect coincidences Signup and view all the answers

What is the purpose of radionuclide generator in PET imaging?

To produce other useful radionuclides Signup and view all the answers

What type of information do gamma images provide?

Functional and physiological information Signup and view all the answers

Which organs generally receive the highest doses after an intravenous injection?

Organs of interest and excretion Signup and view all the answers

What is the unit of the effective dose?

Sievert (Sv) Signup and view all the answers

What is the purpose of the tissue-weighting factor (WT)?

To weight each organ absorbed dose to produce an equivalent dose Signup and view all the answers

What is the typical effective dose of most nuclear medicine investigations?

Less than 5mSv Signup and view all the answers

Which type of imaging delivers doses in the region of 5mSv?

Bone and static brain imaging Signup and view all the answers

What is the effective dose (E) calculated from?

The differing sensitivities of the various organs and tissues to irradiation Signup and view all the answers

Why is the effective dose (E) calculated?

To give a measure of risk Signup and view all the answers

What is the purpose of imaging with 67Ga?

Tumour or abscess imaging Signup and view all the answers

What is the typical activity of Technetium-99m diphosphonates for bone imaging?

600 MBq Signup and view all the answers

What is the effective dose of Lung ventilation imaging with Technetium-99m DTPA aerosol?

0.1 mSv Signup and view all the answers

What is used to check the accuracy of the dose calibrator?

A reasonably long-lived source, such as 57Co Signup and view all the answers

What is the purpose of placing the vial in the 'well' of a large re-entrant ionisation chamber?

To check and record the activity before administration Signup and view all the answers

What is the effective dose of Heart imaging with Technetium-99m MIBI?

18 mSv Signup and view all the answers

What is the typical activity of Gallium-67 citrate for infection imaging?

150 MBq Signup and view all the answers

What should patients do to minimize their dose?

Drink a good deal of water and empty the bladder frequently Signup and view all the answers

Why should female patients avoid conception for a certain period after administration of long-lived diagnostic radionuclides?

To minimize the dose to the fetus Signup and view all the answers

What advice should be given to male patients?

No particular advice is needed Signup and view all the answers

Why should certain examinations be avoided if a female patient is or may be pregnant?

To minimize the dose to the fetus Signup and view all the answers

What should a breast-feeding mother do when undergoing a diagnostic examination?

Interrupt breast-feeding for a certain period Signup and view all the answers

Why is it important to handle radionuclides carefully?

To avoid internal radiation due to accidental ingestion or inhalation of the radionuclide Signup and view all the answers

What should be controlled when handling radionuclides?

The spread of radioactive materials to the environment, workplace, and persons Signup and view all the answers

What is the purpose of using long-handled forceps in handling radionuclides?

To reduce radiation doses to the fingers Signup and view all the answers

What is the purpose of a lead barrier in handling radionuclides?

To reduce radiation doses to the body and face Signup and view all the answers

What is the purpose of tungsten or lead glass sleeves on syringes?

To reduce radiation doses to the fingers Signup and view all the answers

Why are syringes vented into swabs or closed containers?

To reduce radiation doses to the atmosphere Signup and view all the answers

Why are waterproof surgical gloves worn when handling radionuclides?

To reduce radiation doses to the skin Signup and view all the answers

Why is it important to cover cuts and abrasions when handling radionuclides?