Intro to CT scan machine

1. Syed Mustafa Jamal

2. • CT stands for Computed Tomography.
• The word computed suggests that it is
being assembled.
• The Greek word tomos means "slice", and the Greek
word graphein means "write".
• Together, the word Computed Tomography is used for
images taken as slices, which are then assembled
together.
• The 3D image is made after many 2-dimensional (2D) X-
ray images are taken around a single axis of rotation - in
other words, many pictures of the same area are taken
from many angles and then placed together to produce a
3D image.

3. • A CT scanner emits a series of narrow beams
through the human body as it moves through an
arc, unlike an X-ray machine which sends just one
radiation beam. The final picture is far more
detailed than an X-ray image.
• Inside the CT scanner there is an X-ray detector
which can see hundreds of different levels of
density. It can see tissues inside a solid organ.
This data is transmitted to a computer, which
builds up a 3D cross-sectional picture of the part
of the body and displays it on the screen.

4. • CT scans work similarly to X-rays. Except they do not use
the conventional imaging techniques. A detector is used
instead that helps convert the rays into a 3D digital
image.

5. • Video

6. • A conventional X-ray image is basically a shadow: You
shine a "light" on one side of the body, and a piece of film
on the other side registers the silhouette of the bones.
• In a CT scan machine, the X-ray beam moves all around
the patient, scanning from hundreds of different angles.
The computer takes all this information and puts together
a 3-D image of the body.

7. Although CT scans are a source of ionizing radiation and
can cause cancer. Yet they have a lot of advantages.
• A CT scanner emits a series of narrow beams through
the human body, producing more detail than standard
single beam X-rays.
• CT scanners are able to distinguish tissues inside a solid
organ. Contrast dyes are sometimes used to improve the
clarity of the image.
• CT scanning is particularly useful for getting detailed 3D
images of certain parts of the body, such as soft tissues,
blood vessels, and the brain.
• A CT scan is able to illustrate organ tear and organ injury
quickly and so is often used for accident victims.