Question

1. Think of the various forms of electromagnetic radiation spectrum around you daily. List at least three types of EM radiation you interacted with today.
2. At what speed does EM radiation travel at?
3. List the three primary factors that affect a radiographic image?
4. List the five radiographic/optical densities in order of the most radiopaque to the most radiolucent.

Answer 1

1) The three types of EM radiation that are commonly interacted :-

Radio waves

• Lowest frequencies of all type of electro magnetic radiation.
• It is used for long range communication.

Infra red radiation

• This type of radiation are used in TV remote and burglar's alarm

X -rays.

• These Rays are used for checking bone fractures.

2)

• EM radiation travels at 3 108 meter per second.
• EM radiation are a type of energy that is commonly known as light, which travel at a speed of 3 108 meter per second through vaccum.

3)

• Primary factor affect a radiographic image ( x -ray quantity) are :- milliamperage-seconds (mAs), kilovoltage (kVp), source–image receptor distance (SID), and filtration.
• Factors affecting X ray quantity are Kilovoltage and Filtration.

4)

• five radiographic/optical densities in order of the most radiopaque to the most radiolucent are :-

1. Metal - most radiopaque ( white)
2. Bone
3. water ( soft tissue)
4. fat
5. air - most radiolucent ( blackest)