Question 1

At extremely high contrast, any DR image will appear ____________________.

Accepted Answer

The answer of At extremely high contrast, any DR image...

Question 2

____ is used by imaging scientists and engineers to mean the ratio between the highest detectable radiation level and the lowest detectable radiation level for an image receptor.

Accepted Answer

Latitude refers to the difference between the highest and lowest detectable radiation levels in an image receptor. It is used by imaging scientists and engineers to describe the dynamic range of the imaging system. It is also known as exposure latitude. Range-of-adjustment and exposure factor creep are not commonly used terms in imaging science.

Question 3

When an exam is scheduled for a particular imaging resource, the RIS makes a list of patients available to the DR ____________________ station.

Accepted Answer

The answer of When an exam is scheduled for a...

Question 4

Bad electronic images can disappear without a trace; bad films can also disappear, but leave which of the following?

Accepted Answer

The answer of Bad electronic images can disappear without a...

Question 5

____ manufacturers have developed a variety of phantoms and automated tests to assist us in assessing performance on a periodic basis.

Accepted Answer

The answer of ____ manufacturers have developed a variety of...

Question 6

Because verifying every performance parameter before each exam would interfere with clinical operations, periodic measurements assure that the system is properly configured and calibrated and that performance has not ____________________.

Accepted Answer

The answer of Because verifying every performance parameter before each...

Question 7

The Digital Imaging and Communications in Medicine (DICOM)standard specifies the format and content of the ____________________ file.

Accepted Answer

The answer of The Digital Imaging and Communications in Medicine...

Question 8

The specific QC tests that are required for digital mammography are those specified by the imaging equipment manufacturer, with the exception of the limitation on maximum radiation dose, which is not more than that allowed for a ____.

Accepted Answer

The limitation on maximum radiation dose for digital mammography is not more than that allowed for screen-film mammography, which means that the specific QC tests required will be similar to those used in screen-film mammography. Task allocation matrix and GSDF are not relevant to the QC tests for digital mammography. DR (digital radiography) is a type of digital imaging but is not specific to mammography and therefore not the best choice for this question.

Question 9

Some errors are the result of improper practice by the technologist, such as incorrect technique factor selection and artifacts from patient clothing or jewelry that interfere with the projected ____________________.

Accepted Answer

The answer of Some errors are the result of improper...

Question 10

____ is reduced by the range of radiation levels that are produced by the range of tissue densities and thicknesses of the anatomy included in the radiographic projection.

Accepted Answer

Exposure latitude is reduced by the range of radiation levels that are produced by the range of tissue densities and thicknesses of the anatomy included in the radiographic projection. The other options are not the best choices because "latitude" is already included in option D, "range-of-adjustment" is not directly related to the question, and "exposure factor creep" is not a commonly used term in radiography.

Question 11

The tendency to increase exposure by using higher technique factors than indicated on the technique guide for manual exams and by using plus density settings on AEC exams is an example of ____.

Accepted Answer

Exposure factor creep refers to the gradual increase in radiation exposure beyond what is necessary to produce a diagnostic image, often due to the operator's desire for a more easily visible image. This can lead to unnecessary patient exposure and increase the risk of radiation-induced harm.

Question 12

A simple ____________________ error in selecting the wrong patient or wrong examination from the worklist creates a condition that may be more difficult to detect than a typographical error.

Accepted Answer

The answer of A simple ____________________ error in selecting the...

Question 13

Having considered specific QC activities that can help monitor and improve image quality, it is useful to construct a table that identifies each QC task and the party responsible for performing the task.What is this table called?

Accepted Answer

The table that identifies each QC task and the party responsible for performing the task is called a task allocation matrix.

Question 14

For cassette-based systems, the duration of erasure could be too short or the intensity of the erasure could be too low, perhaps from burned out erasure ____________________.

Accepted Answer

The answer of For cassette-based systems, the duration of erasure...

Question 15

When ____________________ in performance is observed, and corrective action is taken, it is important to verify that performance has returned to normal levels.

Accepted Answer

The answer of When ____________________ in performance is observed, and...

Question 16

Sometimes improper operation of the ____ system is the underlying cause of a failure to detect the radiation field.

Accepted Answer

DR (digital radiography) is the imaging system that captures images using digital sensors. Improper operation of the DR system can cause a failure to detect the radiation field, leading to suboptimal image quality or incorrect diagnosis. Examples of improper operation include incorrect calibration of the detector, incorrect exposure settings, or malfunctioning of the system components. CR (computed radiography) is also a digital imaging system but uses a cassette-based detector instead of a digital sensor. VOI (volume of interest) and QC (quality control) are not imaging systems and do not directly affect the detection of radiation fields.

Question 17

The period of ____________________ is important in deciding upon which indicators of changes in performance we are going to monitor routinely.

Accepted Answer

The answer of The period of ____________________ is important in...

Question 18

____ analysis is a time-honored method for assessing and improving quality of imaging operations.

Accepted Answer

Reject analysis, also known as reject rate analysis, is a method used to measure the number of image retakes or rejections within a specific time period. By analyzing the root causes of these rejections, imaging operations can identify areas for improvement and implement corrective action plans to decrease reject rates over time. This helps to ensure higher quality images and enhances patient safety. Residual analysis, signature analysis, and DR (digital radiography) are not commonly used methods for assessing and improving quality of imaging operations.

Question 19

If the operator interface to the machine is extremely complex, ____________________ errors will increase exponentially.

Accepted Answer

The answer of If the operator interface to the machine...

Question 20

Acquiring a ____ image according to the specific conditions of the manufacturer makes it possible to verify uniformity, absence of receptor defects, gain, and the value of the DR exposure indicator.

Accepted Answer

Acquiring a flat-field image is essential in verifying uniformity, absence of receptor defects, gain, and the value of the DR exposure indicator. A ghost image refers to a faint image left on a detector after previous exposure and is not relevant to the specific conditions of the manufacturer. A process map is a tool for identifying and monitoring process performance, and not relevant in this context. While digital is a broad term, it could be considered a possible answer, but it is not as specific as flat-field.

Quiz 10: Quality Control for Digital Radiography