A virtual colonoscopy is an imaging procedure which uses CT
scans and computer software to produce a three-dimensional
image of the colon and rectum.
Although most people think that virtual colonoscopy is new, it
was first considered 15 years ago. Improvements in technology
and software allowed it to become a reality in the early
2000’s.
Where is a virtual colonoscopy performed?
A virtual colonoscopy is performed in the hospital or clinic
Imaging/ Radiology Department.
What is the preparation required for a virtual colonoscopy?
Some preparations vary but you will be asked to take a
laxative or other medication at home the day before to clear
the stool from the colon. This is the same preparation you
would follow for a standard colonoscopy.
How is the procedure performed?
You will be asked to lie down on your side with your knees
toward your chest. A small flexible tube will be inserted into
your rectum. Air is pumped into the tube to make the colon
bigger and easier to see. After this, you will be asked to lie
on your back. The bed slides through an open ring where x-rays create images of your colon.
These pictures are viewed on a
video monitor. The exam takes about 20 minutes.
Differences between virtual and standard colonoscopy
include:
Both
procedures can spot large polyps. Virtual colonoscopy is not
as detailed as standard colonoscopy and may miss small polyps
or flat lesions.
No sedation
is necessary for a virtual colonoscopy and you are usually
able to resume normal activities after the test. Standard
colonoscopy requires IV sedation and is usually performed in
an outpatient surgery facility.
There is
minimal risk of puncturing the colon using virtual
colonoscopy.
Virtual
colonoscopy requires radiation exposure. Although relatively
small, it could add up with repeated testing.
If polyps
are found during a virtual colonoscopy they cannot be removed
or a biopsy performed at the time of the exam. You would have
to have a standard colonoscopy for those procedures. Standard
colonoscopy is considered the “gold standard” by many
professionals because it provides the opportunity to identify
precancerous polyps and cancer and do the biopsy or removal of
these lesions as soon as possible.
Virtual
colonoscopy is not yet covered by Medicare.
There is a
lack of standardization for virtual colonoscopy. It is an
option but limitations and unanswered question still remain.
It is
important for you to discuss colon cancer screening options
with your physician.
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Austin, TX 78758 | 512.901.1111
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