NCCN Guidelines for Patients
Lung Cancer Screening, Version 1.2017
Should you start now?
The LDCT test
The LDCT test
LDCT takes many pictures of the inside of your body
from different angles using x-rays. The amount of
radiation used is much lower than standard doses
of a CT (
omography) scan. Contrast dye
should not be used for screening LDCT.
Before the test
You should remove any metal objects on your body.
These objects can affect the pictures taken of your
lungs. The machine is large and has a tunnel in the
See Figure 5
. During the test, you will lie
on a table that moves through the tunnel. Pillows or
straps may be used to keep you still during the test.
You will be alone in the room, but a CT technologist
will operate the machine in a nearby room. The CT
technologist can see you and the machine through
a window. He or she will be able to hear and speak
with you at all times.
During the test
You will be asked to take a deep breath and hold it in
for a few seconds while the pictures are taken. This
is done to make sure the images are of good quality
and not blurry. As the machine takes pictures, you
may hear buzzing, clicking, or whirring sounds. While
it only takes seconds to take the pictures, the whole
process takes about 20–30 minutes.
A CT machine is large and has a
tunnel in the middle. During the
test, you will need to lie on a table
that moves through the tunnel.