Medical physics slide show

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

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