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REAL LIFE PHYSICS IN MEDICINE
is
X-rays, CT scans, MRI scansAnd new scanning
technologies PET scans and MEG
are essential in the development of many scanning
technologies like:
Learning objectivesAt the end of the activities you
can:1. Explain the work of the tolls2. Distinguish the advantages and
disadvantages of x-rays, CT scans, MRI scans, PET scans and MEG scans
3. shows the results of a every scanners X-rays, CT scans, MRI scans
And new scanning technologies PET scans and MEG
Use the electromagnetic wave
work
X-rays X-rays is very little
ordinary light can pass through skin. It’s either absorbed at the surface or reflected back.
X-rays to “see” inside we need a kind of “light” with more energy.
Skin
Ordinary Light
X rays
The tolls of x-rays
Taking “X rays”
The patient is placed in front of a source of X
RAYS
A photo graphic plate is placed on the other side of the patient
Most of the X rays pass
through the patient’s body
Real Taking “X rays”
X-rays are absorbed by bone but can pass through skin and
soft tissue
bone
Soft tissue
Photographic
plate
X rays that are absorbed in the photographic plate cause chemical changes. These show as darkened areas when the plate is developed.
X-rays are also partly absorbed by some tissues in the body this creates a
more subtle picture.
bone
Soft tissue
Photographic
plate
The result of the x rays scanner
What part of the body do these X Rays show?
Answer:
A knee
Advantages of Basic
X ray Imaging X rays are easy to produce X ray machines are relatively
cheap In controlled doses X ray
images are safe to the patient
Disadvantages of X ray Imaging
In large doses X rays can be harmful to health
Images are only “shadow prints” in one “plane”…..no 3D information
Imaging of soft tissues and organs is not always very detailed
Check Understanding Answer True or False 1. X rays are made of the same
“stuff” as visible light. They are both forms of “electromagnetic radiation”.
2. X rays were discovered completely by accident during a physics experiment carried out in 1965.
3. X rays can damage healthy tissues.
MRI What do the letters stand for?
M……….. Magnetic
R………… Resonance
I…………. Imaging
MRI scanners do not use X rays.
CONCLUTION PHYSICS is very important to
MEDICINE because use
video