Question 1

Which of the following changes would produce a digital image with decreased brightness?

Accepted Answer

Because the computer will adjust brightness to an acceptable level,digital image brightness is independent of mAs,kVp,and patient thickness.

Question 2

Using a Carestream digital imaging system, if an image's EI number is 1800 while the optimal range ends at 1200, this means that the IR was ______________ and the exposure to the IR needs to be ___________________.

Accepted Answer

An EI number of 1800 indicates overexposure, which means the exposure to the IR needs to be reduced. The optimal range ends at 1200, which is a difference of 1/4th of the exposure. Therefore, the exposure needs to be reduced by a factor of four.

Question 3

When using a film-screen imaging system, changing from small to large focal spot size would result in _____________ density and ____________ spatial resolution.

Accepted Answer

Changing from a small to a large focal spot size does not affect the density of the image but decreases the spatial resolution due to increased penumbra or blurring.

Question 4

When using a digital imaging system, changing from 8 $\times$ 10 collimation to 14 $\times$ 17 collimation would result in _____________ brightness and ____________ contrast.

Accepted Answer

The answer of When using a digital imaging system, changing...

Question 5

Using an Agfa digital imaging system, if an image's exposure indicator is 2.3 lgM while the optimal range begins at 2.6 lgM, this means that the IR was ______________ and the exposure to the IR needs to be ___________________ .

Accepted Answer

The answer of Using an Agfa digital imaging system, if...

Question 6

When using a digital imaging system, changing from 40" SID to 72" SID would result in _____________ brightness and ____________ contrast.

Accepted Answer

In digital imaging systems, brightness and contrast are primarily controlled by post-processing algorithms, not by changes in SID (Source-to-Image Distance). Therefore, changing the SID from 40" to 72" would not affect the brightness or contrast of the image.

Question 7

When using a film-screen imaging system, changing from a 200 to a 400 speed system would result in _____________ density and ____________ spatial resolution.

Accepted Answer

Changing from a 200 to a 400 speed system would result in increased density and decreased spatial resolution. This is because a higher speed system is more sensitive to radiation, resulting in an increase in overall density. However, the increased sensitivity also leads to a decrease in spatial resolution, as the larger silver halide crystals used in faster film are less able to capture fine detail.

Question 8

When using a film-screen imaging system, increasing the central angle would result in _____________ density and ____________ spatial resolution.

Accepted Answer

The answer of When using a film-screen imaging system, increasing...

Question 9

The visibility of anatomic structures in a radiographic image is determined by:

Accepted Answer

The answer of The visibility of anatomic structures in a...

Question 10

When using a film-screen imaging system, changing from 85 to 70 kVp would result in _____________ density and ____________ contrast.

Accepted Answer

Decreasing the kVp from 85 to 70 reduces the penetrating power of the x-rays, resulting in decreased density (darker image). Lower kVp also increases contrast by producing more differences in the shades of gray.

Question 11

A film-screen image produced using 16 mAs @ 80 kVp has to be repeated because it is too dark.Which of the following exposure factors would be the best choice to correct the problem?

Accepted Answer

The mAs value directly affects the amount of radiation used to create the image, while kVp affects the quality or energy of the radiation used. Since the image is too dark, increasing the mAs will increase the amount of radiation and improve the brightness. However, changing the kVp is not necessary since the problem is not related to the quality of radiation. Option B (8 mAs @ 80 kVp) is the closest option to the original exposure factors and has an increased mAs to provide more radiation for a brighter image.

Question 12

Using a Konica digital imaging system, if an image's S number is 600 while the optimal range ends at 300, this means that the IR was ______________ and the exposure to the IR needs to be ___________________.

Accepted Answer

The S number is inversely proportional to the exposure; a higher S number indicates underexposure. Since the optimal range ends at 300 and the S number is 600, the image is underexposed, and the exposure needs to be doubled.

Question 13

When using a digital imaging system, changing from no grid to an 8:1 ratio grid would result in _____________ brightness and ____________ spatial resolution.

Accepted Answer

Using a grid affects contrast by reducing scatter radiation but does not directly affect brightness or spatial resolution in digital imaging systems.

Question 14

When using a digital imaging system, changing from 70 to 85 kVp would result in _____________ brightness and ____________ spatial resolution.

Accepted Answer

In digital imaging systems, brightness is primarily controlled by post-processing, not kVp. Spatial resolution is determined by factors like pixel size and matrix size, not kVp.

Quiz 9: Image Evaluation

Which of the following changes would produce a digital image with decreased brightness?

Using a Carestream digital imaging system, if an image's EI number is 1800 while the optimal range ends at 1200, this means that the IR was and the exposure to the IR needs to be _____.

When using a film-screen imaging system, changing from small to large focal spot size would result in _ density and spatial resolution.

When using a digital imaging system, changing from 8 $\times$ 10 collimation to 14 $\times$ 17 collimation would result in _ brightness and contrast.

Using an Agfa digital imaging system, if an image's exposure indicator is 2.3 lgM while the optimal range begins at 2.6 lgM, this means that the IR was and the exposure to the IR needs to be _____ .

When using a digital imaging system, changing from 40" SID to 72" SID would result in _ brightness and contrast.

When using a film-screen imaging system, changing from a 200 to a 400 speed system would result in _ density and spatial resolution.

When using a film-screen imaging system, increasing the central angle would result in _ density and spatial resolution.

The visibility of anatomic structures in a radiographic image is determined by:

When using a film-screen imaging system, changing from 85 to 70 kVp would result in _ density and contrast.

A film-screen image produced using 16 mAs @ 80 kVp has to be repeated because it is too dark.Which of the following exposure factors would be the best choice to correct the problem?

Using a Konica digital imaging system, if an image's S number is 600 while the optimal range ends at 300, this means that the IR was and the exposure to the IR needs to be _____.

When using a digital imaging system, changing from no grid to an 8:1 ratio grid would result in _ brightness and spatial resolution.

When using a digital imaging system, changing from 70 to 85 kVp would result in _ brightness and spatial resolution.

Quiz 9: Image Evaluation

Which of the following changes would produce a digital image with decreased brightness?

Using a Carestream digital imaging system, if an image's EI number is 1800 while the optimal range ends at 1200, this means that the IR was ______________ and the exposure to the IR needs to be ___________________.

When using a film-screen imaging system, changing from small to large focal spot size would result in _____________ density and ____________ spatial resolution.

When using a digital imaging system, changing from 8 ×\times× 10 collimation to 14 ×\times× 17 collimation would result in _____________ brightness and ____________ contrast.

Using an Agfa digital imaging system, if an image's exposure indicator is 2.3 lgM while the optimal range begins at 2.6 lgM, this means that the IR was ______________ and the exposure to the IR needs to be ___________________ .

When using a digital imaging system, changing from 40" SID to 72" SID would result in _____________ brightness and ____________ contrast.

When using a film-screen imaging system, changing from a 200 to a 400 speed system would result in _____________ density and ____________ spatial resolution.

When using a film-screen imaging system, increasing the central angle would result in _____________ density and ____________ spatial resolution.

The visibility of anatomic structures in a radiographic image is determined by:

When using a film-screen imaging system, changing from 85 to 70 kVp would result in _____________ density and ____________ contrast.

A film-screen image produced using 16 mAs @ 80 kVp has to be repeated because it is too dark.Which of the following exposure factors would be the best choice to correct the problem?

Using a Konica digital imaging system, if an image's S number is 600 while the optimal range ends at 300, this means that the IR was ______________ and the exposure to the IR needs to be ___________________.

When using a digital imaging system, changing from no grid to an 8:1 ratio grid would result in _____________ brightness and ____________ spatial resolution.

When using a digital imaging system, changing from 70 to 85 kVp would result in _____________ brightness and ____________ spatial resolution.

Using a Carestream digital imaging system, if an image's EI number is 1800 while the optimal range ends at 1200, this means that the IR was and the exposure to the IR needs to be _____.

When using a film-screen imaging system, changing from small to large focal spot size would result in _ density and spatial resolution.

When using a digital imaging system, changing from 8 $\times$ 10 collimation to 14 $\times$ 17 collimation would result in _ brightness and contrast.

Using an Agfa digital imaging system, if an image's exposure indicator is 2.3 lgM while the optimal range begins at 2.6 lgM, this means that the IR was and the exposure to the IR needs to be _____ .

When using a digital imaging system, changing from 40" SID to 72" SID would result in _ brightness and contrast.

When using a film-screen imaging system, changing from a 200 to a 400 speed system would result in _ density and spatial resolution.

When using a film-screen imaging system, increasing the central angle would result in _ density and spatial resolution.

When using a film-screen imaging system, changing from 85 to 70 kVp would result in _ density and contrast.

Using a Konica digital imaging system, if an image's S number is 600 while the optimal range ends at 300, this means that the IR was and the exposure to the IR needs to be _____.

When using a digital imaging system, changing from no grid to an 8:1 ratio grid would result in _ brightness and spatial resolution.

When using a digital imaging system, changing from 70 to 85 kVp would result in _ brightness and spatial resolution.