Question 1

During a fluoroscopic examination,a resettable cumulative timing device times the x-ray beam-on time and sounds an audible alarm or temporarily interrupts the exposure after the fluoroscope has been activated for what length of time?

Accepted Answer

According to the NCRP (National Council on Radiation Protection and Measurements) report, the resettable cumulative timing device should interrupt the exposure or sound an audible alarm after the fluoroscope has been activated for 5 minutes.

Question 2

Digital radiography images can be accessed:

Accepted Answer

Digital radiography images can be accessed at several workstations at the same time, making image viewing very convenient for physicians providing patient care. This flexibility allows for easier collaboration among healthcare providers and quicker access to patient information, which can lead to better decision-making and improved patient outcomes.

Question 3

When performing a mobile fluoroscopic procedure,to reduce the radiation exposure to the patient,the radiographer must use a minimal source-skin distance of:

Accepted Answer

B

Question 4

Sharper size restriction of the radiographic beam is achieved when a cone or cylinder is:

Accepted Answer

The answer of Sharper size restriction of the radiographic beam...

Question 5

CR imaging has greater ____________ flexibility than conventional screen-film radiography.

Accepted Answer

CR imaging allows for greater flexibility in kilovoltage settings, which can be adjusted to optimize contrast and image quality for a variety of anatomical regions and patient sizes. Milliamperage is typically set at a constant value for each exposure, and time of exposure is predetermined by the system based on the desired image receptor exposure. X-ray beam collimation is important for minimizing patient radiation dose but does not provide greater flexibility in image acquisition parameters.

Question 6

When the speed of screen-film systems doubles,for example,when changing from a 200-speed to a 400-speed system,patient radiation exposure is ______ by approximately ______.

Accepted Answer

When the speed of screen-film systems doubles, radiation exposure to the patient is reduced by approximately 50%. This is due to the fact that faster screen-film systems require less radiation exposure to produce a diagnostic image.

Question 7

What is the purpose of radiographic beam filtration?

Accepted Answer

The answer of What is the purpose of radiographic beam...

Question 8

Current federal standards limit entrance skin exposure rates of general-purpose intensified fluoroscopic units to a maximum of ______________ measured at tabletop with the image intensifier entrance surface at a prescribed 30 cm above.

Accepted Answer

The answer of Current federal standards limit entrance skin exposure...

Question 9

Which of the following is not an x-ray beam limitation device?

Accepted Answer

The answer of Which of the following is not an...

Question 10

In standard image intensification fluoroscopy,an x-ray beam half-value-layer (HVL) of 3 to 4.5 mm aluminum is considered acceptable when peak kilovoltage ranges from:

Accepted Answer

The answer of In standard image intensification fluoroscopy,an x-ray beam...

Question 11

Computed radiography,because of its higher exposure latitude,makes grid use on the pediatric population:

Accepted Answer

Computed radiography has a higher exposure latitude, which means it can capture more detail in images with a wider range of exposures. This makes grid use less necessary than it was previously believed, especially for pediatric populations who are more sensitive to ionizing radiation. However, it is still necessary to use a grid for certain examinations, such as those involving thicker body parts or higher kilovoltage techniques. Ultimately, the decision to use a grid should be made on a case-by-case basis.

Question 12

Depending on the area of the body being examined with a fluoroscopic image intensification system,for adult patients,a range of ______ kVp is generally used.

Accepted Answer

A range of 75 to 110 kVp is generally used for adult patients depending on the area of the body being examined with a fluoroscopic image intensification system. This range provides sufficient penetration for most structures while limiting patient radiation exposure.

Question 13

When obtaining a dorsoplantar projection of a foot,which of the following types of filters should be used to provide a greater uniform density of the anatomy?

Accepted Answer

A wedge filter is the best choice for obtaining a dorsoplantar projection of the foot. The wedge filter is placed on top of the cassette and gradually increases in thickness from one end to the other to compensate for the divergence of the x-ray beam. This provides a more uniform density of the anatomy on the image. The other types of filters listed (bilateral wedge, trough, and Thoraeus) are not commonly used for obtaining a dorsoplantar projection of the foot.

Question 14

When using digital fluoroscopy systems,making use of the last-image-hold feature can:

Accepted Answer

The last-image-hold feature allows the fluoroscopist to freeze the last image obtained, reducing the need for continuous fluoroscopy and the associated radiation dose to the patient. It does not eliminate the need to collimate the primary beam, nor does it eliminate patient motion (involuntary or voluntary).

Question 15

To visualize smaller and lower contrast objects during interventional procedures,high-level-control fluoroscopy uses exposure rates that are ____________ those normally used in routine fluoroscopy.

Accepted Answer

High-level-control fluoroscopy uses exposure rates that are higher than those normally used in routine fluoroscopy to visualize smaller and lower contrast objects during interventional procedures.

Question 16

Federal government specifications recommend a minimum total filtration of _______________ for stationary (fixed) fluoroscopic x-ray units operating above 70 kVp.

Accepted Answer

The answer of Federal government specifications recommend a minimum total...

Question 17

A radiographer uses a high-speed,rare-earth screen-film system with optimal technical exposure factors to obtain PA and lateral radiographs of a 2-year-old child's chest.To maximize reduction of radiation exposure to the patient following adequate immobilization,the radiographer should:

Accepted Answer

The answer of A radiographer uses a high-speed,rare-earth screen-film system...

Question 18

When a fluoroscopic image is electronically amplified by the use of an image intensification system,which of the following benefits results?
1)Increased image brightness
2)Saving of time for the radiologist
3)Patient dose reduction

Accepted Answer

Image intensification in fluoroscopy increases image brightness, which allows for lower doses of radiation to produce adequate images, thus reducing patient dose. Additionally, the enhanced image quality and brightness save time for the radiologist by making diagnosis more efficient.

Question 19

When an exposed computed radiography imaging plate is ready to be processed,an imaging reading unit is used to scan the photostimulable phosphor imaging plate with a helium-neon laser beam.This process results in the emission of violet light that is changed into an electronic signal by a device called a:

Accepted Answer

A photomultiplier tube amplifies the electronic signal produced by the emitted violet light during the scanning process of a computed radiography imaging plate. The other options - charge-coupled device array, photodiode, and scintillator - are not involved in this specific process of reading and processing computed radiography imaging plates.

Question 20

Compared with the traditional material in the front of a cassette (aluminum or cardboard),the cassette front containing the carbon fiber absorbs approximately ______ as much radiation,resulting in a __________ dose for the patient because ________ radiographic techniques are required to produce the recorded image.

Accepted Answer

The answer of Compared with the traditional material in the...

Quiz 11: Equipment Design for Radiation Protection