Question 1

If a vendor provides a fixed-speed class operation, the system operates as a screen/film system of the selected ____________________.

Accepted Answer

The answer of If a vendor provides a fixed-speed class...

Question 2

In order to visualize the____________________ structures of interest, some initial preprocessing must occur during imaging data extraction.

Accepted Answer

The answer of In order to visualize the____________________ structures of...

Question 3

What limits the irradiated volume and reduces undercutting?

Accepted Answer

Collimation refers to the restriction of the size and shape of the radiation beam to the area of interest. By limiting the irradiated volume, collimation reduces the amount of scatter radiation and minimizes undercutting of the adjacent healthy tissues. Saturation and overexposure refer to the amount of radiation delivered, and scattering refers to the dispersion of the radiation beam, which can contribute to increased doses to healthy tissues.

Question 4

The lack of ____________________ generates more scatter that reduces the contrast.

Accepted Answer

The answer of The lack of ____________________ generates more scatter...

Question 5

Since the image contrast is generally determined more by the processing algorithm, the ____________________ does not have the impact on final image contrast as with screen/film systems.

Accepted Answer

The answer of Since the image contrast is generally determined...

Question 6

Except for special extremity plates from ____, all plates are basically made from the same barium fluorohalides and are coated to the same thickness.

Accepted Answer

Kodak is the only company that makes special extremity plates.

Question 7

Which of the following has more of an effect on image contrast than the kVp?

Accepted Answer

The answer of Which of the following has more of...

Question 8

Because of the increased sensitivity to scattered radiation, the kVp should not exceed ____ for any nongrid radiography, including chest.

Accepted Answer

For nongrid radiography, including chest, the kVp should not exceed 80 to minimize the effects of scattered radiation and maintain image quality.

Question 9

If the exposure is >100% above the optimal signal level, the ALARA principle is violated, and the extra scatter generated will degrade the ____________________.

Accepted Answer

The answer of If the exposure is >100% above the...

Question 10

____ occurs when a large number of the pixels will be at the maximum digital value (black)so that there is no signal difference in the very high exposure areas, resulting in a loss of anatomical structures in that region.

Accepted Answer

Saturation occurs when the digital detector or image receptor cannot record the full range of exposures, resulting in loss of detail and anatomical structures in very high exposure areas. There is no signal difference in these areas, so the pixels will all be at the maximum digital value (black) and no further details can be discerned from the image.

Question 11

Which of the following is expressed as pixels/mm, also referred to as pixel density?

Accepted Answer

The answer of Which of the following is expressed as...

Question 12

Acquiring one image on the smallest plate available avoids which recognition error?

Accepted Answer

Exposure field error occurs when the image receptor is too large for the exposure field.

Question 13

____ are much more susceptible to fogging than are conventional film-screen systems.

Accepted Answer

PSP (phosphor storage plate) plates are more susceptible to fogging than conventional film-screen systems because they are reusable and need to be cleaned and carefully handled after each use to avoid accumulation of debris or moisture, which can cause fogging. In contrast, conventional film-screen systems are disposable and sealed in a cassette, which protects them from outside contamination. Image plates and IP (intensifying screen) plates refer to the same type of radiographic equipment, which uses phosphors to capture X-rays and produce digital images, and thus are no different from PSP plates in terms of susceptibility to fogging. Plate margins are not related to fogging.

Question 14

With CR, grid cutoff does not result in a light image, due to the automatic ____________________ of the image.

Accepted Answer

The answer of With CR, grid cutoff does not result...

Question 15

Because of the wide dynamic range of the PSP plate and automatic rescaling, the relationship between exposure and image brightness is ____________________.

Accepted Answer

The answer of Because of the wide dynamic range of...

Question 16

Currently, each major vendor uses a unique ____________________ indicator whose values indicate the exposure delivered to the plate.

Accepted Answer

The answer of Currently, each major vendor uses a unique...

Question 17

If the exposure field is not recognized, the off-focus radiation and scatter outside the exposure field become part of the ____________________.

Accepted Answer

The answer of If the exposure field is not recognized,...

Question 18

What is the standard expression for the receptor's contribution to recorded detail?

Accepted Answer

The receptor's contribution to recorded detail is best expressed as spatial resolution, which refers to the ability of the imaging system to produce images with fine detail and high contrast. This is influenced by the properties of the image receptor, including the size and spacing of its pixels or detector elements. Other factors such as image acquisition and sampling frequency may also affect recorded detail, but they are not specific to the receptor itself. Saturation refers to the maximum level of signal that can be recorded by the imaging system, and is not directly related to detail resolution.

Question 19

_____________________ means that the photon intensity reaching the receptor is higher than that required to produce an optimal image.

Accepted Answer

The answer of _____________________ means that the photon intensity reaching...

Question 20

What would substantial (>2x)overexposure of a body part generate in proportion to the overexposure?

Accepted Answer

Additional scatter is generated when a body part is substantially overexposed (>2x). This is because the excess radiation causes scatter radiation to be produced, which can degrade image quality. High kVp, fogging effect, and low contrast are not directly related to substantial overexposure.

Quiz 4: Effective Use of Computed Radiography