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CT Scan Computerized Tomography

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Emma Kessler

on 4 September 2014

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Transcript of CT Scan Computerized Tomography

How data is collected....
CT Scans can detect what stage the cancer is at. It can also determine if the treatment is being effective or not.
The results can be used to help guide biopsy procedures.
It can also be used to detect abnormal growths in you abdomen.

Axial CT vs. Helical CT
CT scan produces image

which are pieced together in the computer to form a 3D image

CT scans produce one
3D image (no slices) that can more clearly detect small abnormalities
Contrast Agent
Enhances quality of scan

Thinner tissues
like in the digestive and circulatory system, are less visible in scans


contrast agent
is used to help


the x-rays passing through the body and show the tissues and vessels

Safe for patients to ingest

Ex. Circulatory system: ingest an

iodine agent

to reveal blood vessels on scan
Other Uses For CT Scans
How does it work?
What is a CT scan used for?
CT scans can also be used for abdominal reasons such as, problems with the gallbladder, liver, and pancreas.
The CT scan is also used for problems with the kidneys such as, kidney stones and polycystic kidney problems.
CT scans can help to detect the recurrence of tumors. It can also help guide certain local treatments(implantation of radioactive seeds)
Is the CT scan harmful to you?
Costs vary depending on exactly what is involved in the procedure.
How much does it cost to have a CT Scan?
CT Scan is harmful to your body, It involves the use of X-rays, which form ionizing.
Exposure to ionizing radiation is known to increase the risk of cancer.
Lowest cost of a CT scan is $623 and the highest cost of a CT scan is $4,465.
1. Motorized table moves the patient into a circular opening where the procedure is performed (rotates in an
shape, or even uses
electron beam
CT that does not need moving parts)

2. The circular system rotates around the body and sends x-rays,
1mm to 10 mm
in width, through the patient's body

3. The x-ray tube
rotates 10 to 50 times
throughout the scan

4. X-ray beams
(or circle) the body in either a
fan or cone shape
and send beams through the body that reflect out the other side

on the exit side of the patient absorb the beams and send the recorded data into the computer to piece together
Experts that study about the Ct scan computerized Tomography

The purpose of this website is to inform the audience about CT scan.

The website was last updated July 19, 2013.

The website gets its information colleges that study CT scan and they also get their information from the U.S. food and drug administration.

This website helped us because we got a lot of our information from this site. They go into great details about the CT Scan.

How the image is constructed...
....cross sectional scan of the brain
Abdomen scan
CT Scanner
....axial rotation of x-ray beam around the patient
Doctors are able to tell the shape, size, and location of these tumors. They can also show the blood vessels that lead to the tumor. The unique feature about this is that they don't have to make any incisions!
Here you can see the tumor in the persons lung.
1. CT scans use high energy x-rays with
short wavelength light
that can see through the muscles and tissues of the body

2. X-ray is sent through the body: some parts of the body
more of the light and others absorb less

2. On the camera on the far side is a
showing what parts of your body absorbed the light and which did not

3. A
absorbs the x-ray beams that are scattered when exiting the body

4. The computer measures the
angles and wavelengths
at which the beam is absorbed and turns this data into a
mathematical calculation

5. The mathematical calculation is entered into the computer and used to produce the pieces that form the
image slices

6. The slices are put together to form a
3D image
of the patient's body
How the image is created
Fact Triangulation Example
Image slices are put together to form a 3D image of the patient's body.
Full transcript