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17

NCCN Guidelines for Patients

®

Hodgkin Lymphoma, Version 1.2015

2

Treatment planning

Imaging tests

Imaging tests

Imaging tests make pictures (images) of the insides

of your body. They can show where cancer is.

Depending on the test, you may need to stop taking

some medicines, stop eating and drinking for a few

hours, and remove metal objects from your body. If

you are nervous, you may be given a drug, called a

sedative, to help you relax.

Imaging machines are large. You will likely be lying

down during testing. At least part of your body will

be in the machine.

Figure 2.1

shows a CT machine,

which is described next.

After the test, you will likely be able to resume your

activities right away. If you took a sedative, you will

have a waiting period. You may not learn of the

results for a few days since a radiologist needs to see

the pictures. A radiologist is a doctor who’s an expert

in reading the images.

Diagnostic CT

Diagnostic CT (

c

omputed

t

omography) may be

needed before treatment. It isn’t needed if you

receive an integrated PET/CT. Integrated PET/CT is

described next.

CT takes many pictures of a body part from different

angles using x-rays. A computer combines the x-rays

to make detailed pictures. A contrast dye is used for

diagnostic CT. It makes the pictures clearer. The dye

will be injected into your vein and mixed with a liquid

you drink. The dye may cause you to feel flushed or

get hives. Rarely, serious allergic reactions occur. Tell

your doctor and the technicians if you have had bad

reactions in the past.

What part of your body will be imaged depends on

where the cancer might be. Often, CT of the neck,

chest, belly area, and between the hip bones is

done. CT of your neck is needed if your neck may

be treated with radiation. Also, the areas that look

abnormal on PET/CT should be imaged.

PET/CT

PET/CT (

p

ositron

e

mission

t

omography/

c

omputed

t

omography) is the use of two tests. These tests are

PET and CT. Some cancer centers have one machine

that does both tests at the same time. This is called

an integrated PET/CT. At other centers, the scans are

done with two machines. If you’re able, you should

lie on a flat table with your hands above your head

during the test.

Figure 2.1 Computed tomography (CT)

machine

A CT machine is large and has a tunnel in

the middle. During the test, you will lie on a

table that moves slowly through the tunnel.