774623
Description
Mind Map by leonie1997, updated more than 1 year ago
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Created by leonie1997
about 11 years ago
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CT scans (CAT scans)
- What is it?
- Computerised Tomography Scan (CT scan)
- Computerised Axial Tomography Scan (CAT scan)
- A CAT scan consists of x-rays and computer
produced 2D images of the inside of the body
from different angles.
- Computerised Tomography Scan (CT scan)
- The process:
- During a CAT scan the patient
would normally lay down on their
back on a flat bed.
- The CT scanner consists of
an x-ray tube that rotates
around your body.
- The scan will normally take
between 5-10 mins depending on
the part of your body being
scanned.
- X-rays will be received by a detector on the
opposite side from where the x-ray is emmited
from and an image of the scan will be produced by
a computer.
- The images produced by a CT scan
are called Tomograms and are more
detailed than x-rays.
- During a CAT scan the patient
would normally lay down on their
back on a flat bed.
- When would a CAT scan be used?
- CT scans can be used to diagnose
and monitor a variety of different
health conditions.
- Including brain tumors, certain bone
conditions and injuries to internal organs
such as the kidneys, liver, heart or spleen.
- Including brain tumors, certain bone
conditions and injuries to internal organs
such as the kidneys, liver, heart or spleen.
- They're often used to look inside the body before another
procedure takes place, such as radiotherapy treatment or a
biopsy (where a small sample of tissue is taken so that it
can be examined under a microscope.
- CT scans can be used to diagnose
and monitor a variety of different
health conditions.
- Strengths:
- A CT scanner costs between
£744-£1981. This is about half the price
of an MRI scanner.
- A CT scan is less susceptible to patient
movement than an MRI scan and
therefore will not alter the results.
- Widely used on emergency room
patients especially for bone injury
detection and lung and chest
imaging.
- A CT scan has the ability to image
bone, soft tissue and blood vessels
all at the same time.
- A CT scanner costs between
£744-£1981. This is about half the price
of an MRI scanner.
- Weaknesses:
- The radiation dose from a CT scan ranges
from 2-10 mSv which is about the same as
the background radiation received from 3-5
years of someones lifetime.
- Should not be used on pregnant
women or children unless
absolutely necessary.
- Should not be used on pregnant
women or children unless
absolutely necessary.
- The image is not available
immediately as the computer has to
process it.
- It can take a few weeks for the
radiologist to write up a report and get
back to you with the findings.
- A person who is very large may not fit
into the opening of a conventional CT
scanner or may be over the weight
limit for the moving table.
- The radiation dose from a CT scan ranges
from 2-10 mSv which is about the same as
the background radiation received from 3-5
years of someones lifetime.
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