1. Computed
tomography
By Ingunn merete børresen

2. sir godfrey hounsfield
• Brain CT 1972-73
• Whole body CT 1975

3. Ct scan: basic
• Also known as CT or CAT scan.
• Uses x-rays to make detailed pictures of
the structure inside the body.
• During the scan you will lie on a table
that is attached to the scanner.
• Large doughnut shaped machine

4. CT scan: Basic
• CT's primary benefit is the ability to
separate anatomical structures at
different depths within the body.
• A form of tomography can be
performed by moving the X-ray source
and detector during an exposure.

5. Ct scan: Basic
• Anatomy at the target level remains
sharp, while structures at different
levels are blurred.
• By varying the extent and path of
motion, a variety of effects can be
obtained, with variable depth of field
and different degrees of blurring of 'out
of plane' structures

6. Computed tomography scan is an useful machine
which can see diagnosis of the disease on the patient
where others examination still did not see clear.
A patient is receiving a CT scan for cancer. Outside
of the scanning room is an imagine computer that
reveals a 3D image of the body’s inner area.
A patient is moving during the scan, so the picture gets blurring.
That is why you may be asked to hold your breath during the
scanning.
Any motion, whether breathing or body movements can lead to
artifacts on the image.

7. Benefits by using ct
scan
• It’s painless, noninvasive and accurate.
• It’s fast and simple; e.g in emergency cases, they can reveal internal
injuries and bleeding quickly enough to help save lives.
• Less sensitive to patient, than MRI
• After CT examination no radiation remains in patient’s body.

8. Risks by using ct scan
• Always a slight chance to get cancer.
• In general, CT scan is not recommended for pregnant women unless
medically necessary because of potential risk to the baby.
• There is a chance of allergic reaction to the dye.

9. Sources
• http://www.webmd.com/a-to-z-guides/computed-tomography-ct-
scan-of-the-body
• http://www.cancer.gov/cancertopics/factsheet/detection/CT
• http://www.radiologyinfo.org/en/info.cfm?pg=bodice
• http://en.wikipedia.org/wiki/X-ray_computed_tomography
• http://www.ndt-ed.org/EducationResources/CommunityCollege/
Radiography/AdvancedTechniques/computedtomography.htm