Exam 10: Quality Control for Digital Radiography

____ includes all those activities undertaken to get an indication of how well the imaging operation is working.

Since a key aspect of QA is a visual inspection of the DR image, it is important to consider the capabilities of the QC workstation where we are making decisions.

As fewer x-rays are used to produce a DR image, the image appears less and less noisy.

The one test that can and should be done for every DR image is a(n)____________________ assessment of image quality before release.

What can build up over time on DR receptors from environmental sources of radiation?

Each QC system has some sort of registration device that allows direct manual input of demographic and exam information.

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

Technologist supervisors learn quickly to count how many films are in the box at the start-of shift, count again at the end-of-shift, and compare against the number of views produced by all exams during the shift.

In a PACS, a mismatch between the image header and image database information from RIS generates what are known as "exceptions, " "broken studies, " or "orphans."

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 ____.

Automatic rescaling contributes to a common misconception that in DR exposure ____________________ selection is irrelevant to the appearance of the image.

____ 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.

If erasure is inadequate, the previous exposure is superimposed as ____.

Technologists are quick to learn that physicians are less likely to reject overexposed DR images than underexposed DR images.

With integrated systems, the receptor needs to be re-exposed to a uniform field to detect the presence of debris.

____ 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.

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

In the United States, the specifics of QC for digital ____________________ are mandated by the federal government under the Mammography Quality and Standards Act.

The value of the DR exposure indicator is usually visible at the QC ____________________.

Because DR receptors are reused, ____________________ arising from receptor defects, dust and debris that interfere with the collection of light for CR and indirect DR systems, and contaminants such as barium contrast will show up on all subsequent images from that receptor until the problem is corrected.