Renal

Question 1

What are the main tracers used for Renal evaluation?

Answer 1

DMSA (Cortical function/scarring eval) and MAG3 for Tubular Excretion evaluation (BOTH ARE T99M labeled)

Question 2

What is the KeV of Mag 3?

Answer 2

140 KeV

Question 3

What are the 3 phases of a renogram?

Answer 3

1- Vascular Transit phase (30-60 sec)
2- Cortical/Tubular Concentration phase (1-5 min)
3- Excretion phase

Question 4

What is the normal half time of T1/2 of excretion in a normal kidney?

Answer 4

8-12 min is the normal Half time of excretion

Question 5

What is the biological and physical half life of MAG 3?

Answer 5

Physical is 6 hours (it is T99m labeled) and Biological is 4 hours.

Question 6

What type of renal scan would be performed for cortical issues?

Answer 6

DMSA (or less commonly glucoheptonate) as well as using a pinhole camera or high-resolution collimator

Question 7

How does septa length (on a collimator) affect imaging?

Answer 7

In general, the longer the septa, the better the resolution but the lower the count rate (sensitivity) for a given amount of radionuclide.

Question 8

The emission of a positron or an electron is referred to as ____ decay.

Answer 8

beta

Question 9

In beta decay, the _______ is accompanied by a neutrino, a massless(?) and chargeless particle.

Answer 9

positron