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Medical Physics

Edexcel Unit P3.6 MedicalPhysics
by

Jim Baker

on 24 June 2013

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Transcript of Medical Physics

Medical Physics
1 Human Energy
2 Human Power
4 Harmful radiation
5 Radiotherapy
6 Reflection and Refraction
7 Endoscopy
8 An Introduction to Pulse Oximetry
10 Heart Electricity
12 PET Scans
13 Bombardment
14 Annihilation
15 Momentum
16 Ethical issues
Work = Force x Distance moved in direction of force
Units: Joules/J or Newton meters/Nm
Power = work done/time taken
Units: Joules/second
work done
power
time
3 Radiating Energy
When we absorb radiation, the amount received is the
absorbed dose
measured in
Joules per kilogram

(J/kg)
.
Ionising radiations differ in the way in which they affect biological materials.The unit which incorporates both the energy and the biological harm is the
sievert (Sv)
, or the
millisievert (1Sv = 1000 mSv)
. It is known as the
equivalent dose
.
Cancer is caused by abnormal cell growth. This can result in a
malignant tumour
.
Benign tumours
are not cancerous.
Radiotherapy can be used to treat or control cancer. When treatments cannot destroy the cancer they may be able to control the symptoms of cancer. This is known as
palliative care
.
Gamma Knife
Radiation Therapy (Part 1)
Radiation Therapy (Part 2)
An insight into Radiotherapy
Radiation Explained
The Inverse Square law
Inverse Square Law (Beginners' Guide)
Radiation Dose (Part 1)
Radiation Dose (Part 2)
Alpha, Beta, Gamma Radiation
What is radioactive Decay?
Fibre Optics
9 Pulse Oximetry and Oxygen
11 Reading ECGs
The momentum of an object is its mass times its velocity so is a vector quantity. It is measured in
kilogram metres per second (kgm/s)
.
momentum
mass
velocity
Introduction to Momentum
New medical techniques bring with them ethical issues such as the money spent on a PET scanner and cyclotron to produce the radioisotopes could provide kidney dialysis for 60 patients for 5 years.
Full transcript