Tl201

Question 1

What do thallium heart studies show?

Answer 1

Viability of myocardium

Extent of CAD

Question 2

How does thallium work in heart

Answer 2

Tl201 is an analog of potassium K

K is used during muscle contractions and is constantly being pumped in and out of the heart - how much is used is based on blood flow

Question 3

What to look out for with thallium

Answer 3

Redistribution into the myocardium do to the sodium potassium pump

Question 4

What can redistribution cause

Answer 4

False negatives

Question 5

Pt must be imaged within ______ minutes after cessation of stress and why

Answer 5

5-10 minutes

Because redistribution occurs rapidly and will fill in defects

Question 6

SPECT or planar is preferred with Tl201

Answer 6

Spect

Question 7

When should planar images be taken after injection

Answer 7

10 minutes after injection

Question 8

Tl201 dose

Answer 8

2-4 mCi

Question 9

What collimator

Answer 9

LEAP

Question 10

Why would planar images be required

Answer 10

To calculate heart to lung ratio
To assist in the ID of artifacts in spect

Question 11

When to image

Answer 11

Stress first, image 5-10 minutes after

Image delays (rest) 3-4 hours after

Question 12

Tl201 rest dose and image time

Answer 12

2.5-3 mCi

image 10-15 mins after injection and delays at 3-4 hours (up to 24)

Question 13

Tl201 redistribution dose and image time

Answer 13

AFTER the 3-4 he delays

1.5 mCi
Imaged at 10-15 post injection

Question 14

What is the purpose of tl201 redistribution procedure

Answer 14

Increases sensitivity or stress/redistribution