Radiography- Intro to radiology + imagining

Question 1

name 5 imaging methods used?

Answer 1

1. light- photographs
2. X-rays-
   
   1. Computed Tomography / CBCT
3. Magnetic resonance
4. Ultrasound
5. Nuclear Isotopes

Question 2

what are the main reseasons we use imaging?

Answer 2

1. visualise tissue and pathlolgies which are hidden
2. aid in amking diagnosis
3. treatment planning
4. guide treament
5. monitor outcomes

Question 3

what are X-rays

Answer 3

1. they are EM radiation
2. Packets of energy- photons

Question 4

on the EM spectrum what happens when wavelenght increase ?

Answer 4

frequencey decreases and so the waves become less ionising

Question 5

describe the significance of wavelenght and frequency for UV-rays/X-ray/Gamma- rays

Answer 5

shorter wavelenght and high frequence. therefore they are more ionising

Question 6

describe how X-rays are produced using the follwoing:

cathode/anode/ tungsten/ vacuum.

Answer 6

hot cathode fires electrons at high speed towards the anode when the electrons hit tungsten X-rays are produced. This is done in a vacuum.

Question 7

what is the significance of x-rays having short wavlenght and longer wavelenght.

Answer 7

short wavelenght allows for higher energy and greater penetration- Highly Ionising

longer wavelenght (soft wavelenght) allows for lower enegry an less penetration.

Question 8

x-ray film speed plays a role in the imagie quality mention three aspects of it.

Answer 8

1. allows for high sensitivity
2. lower does required
   
   1. poorer quality image

Question 9

what must be done before taking x-rays regarding safety?

Answer 9

must justify the need and the benefit.

Question 10

what are the 4 things that happen when x-rays interact with matter

Answer 10

1. Scattering- change in the photon direction
2. absorption- removal of energy from the beam
3. Attenuation- reduction of intensity due to scattering and absorption
4. Transmitted unchanged

Question 11

what does the colour : black, grey and white tell us about the x-ray.

Answer 11

Black all photons hit the film- Air

Grey some photons hit the film- Bone

White no photons hit the film- Metal

Question 12

what is meant by periapcial regarding teeth ?

Answer 12

It is towards the tooth root ie its apex.

Question 13

what is sialography/ sialogram

Answer 13

it is test used to diagnose salivary gland or ducts in the mouth