Ga-67 Citrate Scan

Front 1

What was Ga-67 Citrate first used for?

Back 1

bone imaging

Front 2

What are the characteristics of Ga-67?

Back 2

Energies: 93, 184, 296, 388 KeV
T 1/2 = 78 hours
Decay: EC, Gamma

Front 3

What type of collimator is used for Ga-67?

Back 3

LEHR or Medium

Front 4

What are the indications for Ga-67 Citrate scan?

Back 4

- fever of unknown origin
- Pulmonary disorders
- myocardial or pericardial inflammatory processes
- immuno-compromised pts (AIDs)

Front 5

What are the advantages of using Ga-67?

Back 5

- does not require a blood withdrawl
- easy to prepare
- easy to administer

Front 6

What are the disadvantages of using Ga-67?

Back 6

- GI tract accumulation
- results are delayed for 24-72 hours
- 64% specificity
- long T 1/2 (78 hrs)
- high energy
- upper colon is the critical organ

Front 7

What is the adult dose and ROA for Ga-67 citrate?

Back 7

5-10 mCi

Front 8

How soon can imaging begin after administering Ga-67 Citrate?

Back 8

As early as 6 hours and continued for 24, 48, and 72 post injection

Front 9

What percentage of Ga-67 is excreted by the kidneys?

Back 9

20-25%

Front 10

What percentage of Ga-67 is excreted by the bowels?

Back 10

20-25%

Front 11

Where is Ga-67 activity expected to accumulate?

Back 11

liver, spleen, bone marrow, skeleton, bowel and kidneys

Front 12

At 72 hours post injection, what organs should not be visible?

Back 12

the kidneys

Front 13

What images should be acquired for a Ga-67 Citrate scan?

Back 13

WB Statics: head/neck, chest, pelvis, lower extremeties
-or-
WB sweep (10 cm/min)

Front 14

What is the MOL for Ga-67 Citrate?

Back 14

It is an iron analogue so it binds to iron-binding protiens. It competes for iron sites and is absorbed by lysosomes and ER of WBC