Exam 21: Digital Radiographic Artifacts

Lossless compression reduces data files _____.

What size is the average CR or DR image file?

Object artifacts in digital imaging can occur from errors in _____. I. x-ray beam collimation II. histogram selection III. patient positioning

Which is/are done to the image during preprocessing? I. Lossless compression II. Partitioning III. Flatfielding

Lossy compression can be used for _____.

It is a safe practice to keep CR cassettes in a "radiation safe" area of an x-ray suite during exams.

Artifacts are an acceptable part of digital imaging.

Each anatomical part has an image histogram with a(n)_____ shape.

The largest standard size for a digital imaging plate is _____.

Computer aided diagnoses (CAD)requires the use of _____.

The size and number of digital images has to be compressed to permit _____.

Lossy compression reduces data files _____.

Histogram selection is done _____.

The software correction that equalizes the response of each pixel to a uniform exposure of x-rays is called _____.

_____ is done during preprocessing to correct for an irregular pattern over the image.

Radiation fatigue occurs in _____.

Cassettes used in computed radiography are more highly sensitive to background and scatter radiation than film/screen cassettes are.

A ghost image can occur in digital imaging because of _____.

Computed radiography cassettes can sit for _____ between exposures.

Which modality produces the largest image files?