Chapter 6 Test Flashcards
In digital imaging, mAs selection has an effect on:
1.) receptor exposure
2.) patient dose
3.) brightness
a.) 1, 2 and 3
b.) 2 and 3 only
c.) 1 only
d.) 1 and 2 only
d.) 1 and 2 only
All of the following are related to spatial resolution except:
a.) millamperage
b.) SID
c.) OID
d.) focal spot size
a.) milliamperage
Dropped pixels are caused by:
a.) nonfunctioning detector elements
b.) electronic interference
c.) double exposure
d.) histogram errors
a.) nonfunctioning detector elements
What does an S number significantly below 200 indicate of an exposure indicator?
a.) insufficient contrast
b.) excessive contrast
c.) excessive receptor exposure
d.) inadequate receptor exposure
c.) excessive receptor exposure
The greatest contributing factor in the production of scatter radiation is:
a.) patient thickness
b.) kvp
c.) patient position
d.) mas
a.) patient thickness
An image demonstrating many brightness levels, or shades of gray, with only slight differences between the levels/shades is said to possess:
1.) long scale contrast
2.) low contrast
3.) short scale contrast
a.) 1 only
b.) 1 and 2 only
c.) 2 only
d.) 2 and 3 only
1 and 2 only
The corduroy effect is caused by:
a.) increased sensitivity to radiation
b.) background radiation
c.) printer malfunction
d.) double exposing the IR
c.) printer malfunction
Dirt/debris would be a ____________ artifact.
a.) image receptor
b.) plate reader
c.) mishandling
d.) operator error
a.) image receptor
As collimation increases, the quantity of scatter radiation decreases.
a.) true
b.) false
a.) true
Foreshortening can be caused by:
a.) adding a CR angle to the part
b.) excessive distance between the object and the IR
c.) insufficient distance between the focus and the IR
d.) the radiographic object being placed at an angle to the IR
d.) the radiographic object being placed at an angle to the IR
Calculate the causal repeat rate for positioning: 1200 total images were taken, 75 repeats, 30 repeats for positioning.
40%
The window width setting in a digital imaging system is used to manipulate which of the following values?
a.) image brightness
b.) image contrast
c.) temporal resolution
d.) spatial resolution
b.) image contrast
A radiograph that has densities that are very different from each other
a.) has high contrast
b.) has long scale contrast
c.) has many shades of gray
d.) has low contrast
a.) has high contrast
When critiquing an image, it is determined that there is a photographic property error. What would be the next step in evaluating the image?
a.) determining if the error is kvp or mas
b.) determining if the error is distortion or magnification
c.) determining if it is an equipment malfunction
d.) determining if it is a patient error
a.) determining if the error is kvp or mas
The appearance of quantam mottle on a radiographic image is caused by:
a.) inadequate receptor exposure
b.) small matrix size
c.) incorrect post processing
d.) excessive receptor exposure
a.) inadequate receptor exposure
If a processor error misrepresents the areas on an image (light is dark/dark is lighter) this is called:
a.) excessive equalization
b.) quantam mottle
c.) electronic noise
d.) laser printer error
a.) excessive equalization
A tech is using a variable mas technique chart for a certain mobile exam. The chart calls for 12 mas by the tech uses 1.5 mas. The resulting image will likely demonstrate:
a.) saturation artifacts
b.) no visible errors
c.) quantam mottle artifact
d.) loss of contrast
c.) quantam mottle artifact
The appearance of saturation on a radiographic image is caused by:
a.) inadequte receptor exposure
b.) small matrix size
c.) incorrect post processing
d.) excessive receptor exposure
d.) excessive receptor exposure
A tech is using a variable kvp technique chart for a certain table top exam. The chart calls for 80 kvp but the tech uses 83 kvp. The resulting image will likely demonstrate:
a.) no visible errors
b.) saturation artifacts
c.) loss of contrast
d.) quantam mottle artifact
a.) no visible errors
To prevent background radiation artifact, which of the following should be done?
a.) erase the IR plates daily
b.) do not expose the IR to heat
c.) handle the IR with care
d.) charge the IR daily
a.) erase the IR plates daily
Phantom artifacts can occur due to:
a.) heat
b.) not erasing the IR
c.) radiation fog
d.) backscatter
b.) not erasing the IR
Increasing atomic number ____________ beam attenuation and _____________ transmission.
a.) decrease, decrease
b.) increase, decrease
c.) increase, increase
d.) decrease, increase
b.) increase, decrease
Low kvp produces ____________ contrast images while high kvp produces _____________ contrast images.
a.) high; low
b.) low; low
c.) high; high
d.) low; high
a.) high; low
How is the primary beam affected when increasing the tube filtration?
a.) increase in the proportion of lower energy x rays
b.) increase in the speed of the xray photons
c.) increase in the number of xray photons
d.) increase in the proportion of higher energy x rays
d.) increase in the proportion of higher energy x rays
Which of the following groups properly identifies the relationship between kvp, scattered radiation and contrast?
a.) low kvp, long scale contrast, increased scatter
b.) high kvp, long scale contrast, decreased scatter
c.) low kvp, short scale contrast, decreased scatter
d.) high kvp, short scale contrast, increased scatter
c.) low kvp, short scale contrast, decreased scatter
Calculate the total image rate: 1500 total images, 220 repeats, 50 repeats were for positioning, 20 were for technical factors.
14.6%
A tech is using a variable kvp technique chart for a certain table top exam. The chart calls for 80 kvp but the tech uses 125 kvp. The resulting image will likely demonstrate:
a.) quantam mottle artifact
b.) loss of contrast
c.) no visible errors
d.) saturation artifact
d.) saturation artifact
What type of relationship does mAs have with exposure reaching the IR?
a.) direct proportional
b.) direct
c.) inverse
d.) inverse proportional
a.) direct proportional
A tech is using a variable mAs technique chart for a certain mobile exam. The chart calls for 1.5 mAs but the tech uses 2 mAs. The resulting image will likely demonstrate:
a.) saturation artifact
b.) loss of contrast
c.) no visible errors
d.) quantam mottle artifact
c.) no visible errors
Increasing collimation results in:
a.) increased scatter production and high contrast
b.) increased scatter production and lower contrast
c.) decreased scatter production and lower contrast
d.) decreased scatter production and higher contrast
d.) decreased scatter production and higher contrast
Decreasing tissue thickness will result in _____________ photon transmission and ____________ photon attenutation.
a.) increased, increased
b.) increased, decreased
c.) decreased, increased
d.) decreased, decreased
b.) increases, decreased
A large matrix will offer what type of spatial resolution?
a.) less
b.) greater
c.) matrices have no affect on spatial resolution
b.) greater
Which of the following changes will increase the amount of distortion appearing on a radiographic image?
1.) use of large focal spot
2.) tube angulations other than perpendicular to the part aligned paralle to the film
3.) increased OID
a.) 1, 2 and 3
b.) 2 and 3
c.) 3 only
d.) 1 and 2
b.) 2 and 3
Elongation of part in relationship to the resulting radiographic image occurs when:
a.) the central ray is perpendicular to the image receptor but the part does not parallel the IR
b.) the central ray is not perpendicular to the image receptor but the part parallels the IR
c.) the central ray is perpendicular to the image receptor and part parallels the IR
d.) none of these
b.) the central ray is not perpendicular to the image receptor bu the part parallels the IR
What term is used when referring to noise on an image?
a.) quantam mottle
b.) acoustic noise
c.) visible noise
d.) fog
a.) quantam mottle
Factors that can impact spatial resolution include:
1.) patient factors
2.) focal spot size
3.) SID
a.) 2 and 3 only
b.) 1, 2 and 3
c.) 1 only
d.) 1 and 2 only
b.) 1, 2 and 3
If a radiograph demonstrates an S number of 80 with no visible exposure errors, the tech should consider which of the following options:
a.) repeat the radiograph using a lower technique
b.) submit the radiograph as is
c.) repeat the radiograph using a higher technique
d.) repeat the radiograph using a grid
b.) submit the radiograph as is
Saturation indicates:
a.) fog
b.) overexposure of the IR
c.) quantam mottle
d.) underexposure of the IR
b.) overexposure of the IR
Which of the following are considered image plate artifacts? (Choose all that apply.)
a.) background radiation
b.) phantom image
c.) backscatter
d.) shading
a.) background radiation
b.) phantom image
c.) backscatter
Physical damage to the structure of a CR image receptor is likely to manifest on a radiograph as:
a.) hyperdense artifact
b.) loss of contrast
c.) loss of spatial resolution
d.) geometric distortion
a.) hyperdense artifact
An increase in the image size of an object compared with its true, or actual size is called:
a.) size distortion
b.) shape distortion
c.) minification
d.) sharpness distortion
a.) size distortion
Calculate the total repeat rate: 1600 total images, 120 repeats
7.5%
SID affects both spatial resolution and image distoriton.
a.) true
b.) false
a.) true
Why do double exposure artifacts occur in DR?
a.) the IR was not erased throughly
b.) backscatter
c.) images are taken rapidly too close together
d.) the image reader malfunctioned
c.) images are taken rapidly too close together
Any radiographer can perform which of the following tests?
a.) noninvasive, simple
b.) noninvasive, complex
c.) invasive, complex
d.) invasive, simple
a.) noninvasive, simple
The primary exposure factor that is used for the penetration during a radiographic exposure is:
a.) SID
b.) KVP
c.) focal spot size
d.) mas
b.) kvp
Limiting scatter radiation does not improve image contrast.
a.) true
b.) false
b.) false
