Radiology M3 - R3: Production of X-rays Flashcards Preview

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Flashcards in Radiology M3 - R3: Production of X-rays Deck (18)
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1
Q

the production of X-rays is dependant on three things, 1 of which is the production of electron. describe how these electrons are produced

A

current is passed through a tungsten element.

current caused the element to heat up causing the breaking off of electrons, this is called THERMOIONIC emmision

this process occurs in the cathode

2
Q

the production of X-rays is dependant on three things, 1 of which is the accelaration of electrons, how is this accomplished.

A

once the elctron have been produced through thermoionic emmision, they are negatively charged.

the electrons are then accelarated to the annode, this is done polar charges and the KpV

3
Q

the production of X-rays is dependant on three things, 1 of which is the deacclerating of the electrons, how does this happen

A

the accelrating electrons hit the annode, the sheer force produce here produces X-rays

4
Q

what would happen to the number of electrons and X-rays if the tube current was increased.

A

the increase in tube current would give more rise to electrons due to an increase in thermoionic emission - this then results in more X-rays

5
Q

when the electrons collide with the anode there are two types of X-ray spectrum

A

continous spectrum - this is known as breaking radiation and has a wide range of photon energies

characteristic spectrum - this spectrum is dependant on the material used in anode and dependant on which electron shell

6
Q

in which spectrum would you expect to find small deflections of photon enegy

A

continous spectrum

7
Q

X - ray defintion - random change in direction after hittin something

A

scattering

8
Q

X - ray defintion - deposition of energy in tissues

A

absorption

9
Q

X - ray defintion - number of x-ray photons in a defined area of the beam

A

intensity

10
Q

X - ray defintion - reduction in intensity of beam due to scattering and absorption

A

attenuation

11
Q

X - ray defintion - removal of electrons from natural atom to give - ve & + ve

A

ionisation

12
Q

X - ray defintion - the abilty of photons to pass through or into tissue/materials

A

penetration

13
Q

can X-rays be detected by human senses

A

no

14
Q

x-ray interations - if x-rays are absorbed do they lose or gain energy

A

lose energy

15
Q

x-ray interactions - if x-rays are completley scattered, do they have a loss of energy

A

no

16
Q

low energy photons are often absorbed by what

A

soft tissues

17
Q

what is the definition of : radiation dose

A

is the amount of radiation absorbed by the patient

18
Q
A