Ventilation scan

Question 1

Radiopharmaceuticals used for Ventilation

Answer 1

Xe-133 Gas (half life 5.3 days, 8-keV) = 10-20 mCi gas inhaled

Tc99m-DTPA aerosol (20-40 mCi aerosol, lead-lined nebulizer)

Tc99m-labeled carbon nanoparticles (Technegas)

Question 2

What is a ventilation scan?

Answer 2

Uses a gas or aerosolized Radiopharmaceutical that the patient breathes in.

Question 3

What does Ventilation study demonstrate?

Answer 3

Air distribution throughout the lungs.

Question 4

Positioning for Xe-133 Vent

Answer 4

Patient Position:
Lying supine (perferred) or upright

Camera in posterior or LPO/RPO view

Question 5

Acquisition X-133gas

Answer 5

Dyanmic serial images, 5-15 sec/frame for up to 305 minutes
or
One 15 sec static frame followed by 15-sec/frame dynamic for 2-3 minutes

Single breath/wash-in
Equilibrum
Wash out

Question 6

Position for Tc99m- DTPA

Answer 6

Inhalation of Aerosol: sitting up or lying down
For imaging: Supine

Camera to acquire 8 views: Ant/Post, Rt Lat/Lt Lat, RAO/LAO, RPO/LPO

Question 7

Acquisition for Tc99m-DTPA Aerosol

Answer 7

Static images in all 8 views

Acquired for 2-5 minutes each or for 200k-300k counts each