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RADT 2403 Chapter 8

QuestionAnswer
The device that receives the radiation after it exits the patient is the: image receptor
In producing a radiographic image, which of the following occurs last? Radiation interacts with image receptor
If a pixel has a bit depth of 10, this means that: it can produce 2^10 shades of gray
What is a matrix? An array of cells arranged in rows and columns
Why can acceptable image be produced with computed radiography (CR) or flat-panel digital radiography (DR) equipment even when the input exposure was exposure was underexposed or overexposed? wide dynamic range of the digital detector
What occurs if the number of pixels in a matrix increases and the field of view remains the same? spatial resolution increases
What is pixel density? number of pixels in a given area
In digital radiography, spatial resolution is improved with increased: matrix size
The number of visible shades of gray available per pixel in a digital image is determined by: bit depth
In producing a radiographic image, which of the following occurs first? quality and quantity of x-ray beam exiting the x-ray beam
Differential absorption occurs because different tissues have varying amounts of photoelectric interactions
Attenuation of the x-ray beam in the diagnostic range is due to absorption and scattering
With the photoelectric interaction, after the incident photon ejects an inner-shell electron, the energy of the photon is reduced to zero
The secondary photon that results from the photoelectric interaction has low energy
At higher kilovoltages within the diagnostic range the percentage of photoelectric interactions decreases
Transmission refers to x-rays leaving the patient that did not interact with atoms
Tissues with higher atomic numbers appear ___ on a digital image brighter
Matter per unit volume defines: tissue density
In producing a radiographic image, which of the following occurs last? radiation interacts with image receptor
Complete absorption of the diagnostic range x-ray photon is the interaction known as photoelectric interaction
The photoelectric interaction involves removal of an inner-shell electron
The ability to remove electrons form an atom is ionization
The probability of a Compton interaction is ___ in bone than tissue same
Scattering in the diagnostic range is due to the Compton effect
Increasing the thickness of the part being imaged results in increased attenuation
Decreased attenuation results in more x-ray photons reaching the image receptor
For every 4-5 cm of tissue, the x-ray beam quantity is reduced by approximately 50%
Scatter radiation that reaches the image receptor creates unwanted exposure and fog
Imaging which of the following results in least attenuation? air in lungs
A high-energy beam results in decreased attenuation
Another name for remnant radiation is exit radiation
Before processing, the image receptor has a __ image latent
Which of the following describes the process of radiographic image formation? differential absorption
X-rays can eject electrons from atoms. This is knowns as: ionization
The x-ray interaction with anatomic tissue that is responsible for scattering is: Compton
Which of the following will increase beam attenuation? thicker anatomic part
Factors that decrease x-ray absorption include: increased x-ray beam quality
The range of exposure intensities an image receptor can accurately detect defines: dynamic range
Digital image quality is improved with: larger matrix size
Increasing the pixel bit depth will: increase contrast resolution
Dynamic imaging of internal structures can be visualized with a fluoroscopy
Which of these will increase the digital image resolution? decreased pixel size
Which of the following will decrease beam attenuation? higher kilovoltage
Created by: brooklynngee8
 

 



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