Week 2 Flashcards
(35 cards)
The process whereby a radiographic image is created by variations in absorption and transmission of the exiting x-ray beam is known as ________________.
attenuation
Which of the following processes occur during the x-ray beam interaction with tissue?
- Absorption
- Photon transmission
- Scattering
1, 2, and 3
The ability of an x-ray photon to remove an atom’s electron is a characteristic known as ________________.
ionization
The x-ray interaction responsible for absorption is ________________.
photoelectric
The x-ray interaction responsible for scattering is ________________.
Compton
Remnant radiation is composed of which of the following?
- Transmitted radiation
- Absorbed radiation
- Scattered radiation
1 and 3 only
What interaction causes unwanted exposure to the image, known as fog?
Compton
Which of the following factors would affect beam attenuation?
- Tissue atomic number
- Beam quality
- Fog
1 and 2 only
The high brightness areas on a radiographic image are created by ________________.
transmitted radiation
An anatomic part that transmits the incoming x-ray photon would create an area of ________________ on the radiographic image.
high brightness
The process of creating a radiographic image by differential absorption varies for film-screen and digital imaging.
True
Which attribute(s) of a radiographic image affect(s) the visibility of sharpness?
A. Distortion
B. Contrast
C. Brightness
D. B and C
B and C
A radiographic image with many shades of gray but few differences among them is said to have ________________.
low contrast
Which of the following is defined as the range of exposure intensities that an image receptor can accurately detect?
Dynamic range
Fluoroscopy uses a continuous beam of x-rays to create images of moving internal anatomic structures.
True
What creates a radiographic image?
Differential absorption of primary x-rays interacting with tissues of varying composition.
What is beam attenuation?
Loss of energy from the primary x-ray beam as it interacts with anatomic tissues.
What can x-rays do to atoms?
Eject electrons (ionization) from atoms within anatomic tissue.
What are the three primary processes of x-ray interaction?
Absorption, transmission, and scattering.
What causes total absorption of an x-ray photon?
Photoelectric effect.
What causes scattering of an x-ray photon?
Compton effect.
What does scatter radiation do to the image?
Provides no useful information and creates fog.
Is the process of differential absorption dependent on IR type?
No, it remains the same regardless of the type of IR.
What does a radiographic image structurally represent?
The anatomic area of interest with varying brightness levels.
