Chapter 9 Book Questions

D. all of the above

A quality radiograph must include: A. accuracy of structural lines displayed B. minimal unsharpness C. visibility of anatomic structures D. all of the above

D. improved sharpness

An imaging system that can resolve 10 Lp/mm instead of 6 Lp.mm is said to have: A. less distortion B. more unsharpness C. more distortion D. improved sharpness

A. is more efficient in converting x-ray exposure to a quality image

An imaging system with a higher detective quantum efficiency (DQE): A. is more efficient tin converting x-ray exposure to a quality image B. produces images with decreased spatial resolution C. can display anatomic structures with less distortion D. produces images with decreased contrast resolution

C. low subject contrast

Anatomic tissues that attenuate the x-ray beam equally are said to have: A. quantum noise B. high contrast C. low subject contrast D. less unsharpness

D. image artifact

Double exposing an image receptor will likely result in: A. pixel pitch B. foreshortening C. increased quantum noise D. image artifact

D. window width

During digital image display, the contrast can be lowered (decreased) by increasing ______________________. A. pixel density B. grayscale C. window level D. window width

B. large, more

For a given field of view (FOV), a __________ matrix size will result in ______________ pixels. A. large, fewer B. large, more C. small, more D. none of the above

C. pixel bit depth

In digital imaging, which of the following determines the range of grayscale available for display? A. pixel density B. matrix size C. pixel bit depth D. exposure indicator

B. increased pixel size

Increasing the displayed field of view (FOV) for a fixed matrix size will result in: A. decreased pixel pitch B. increased pixel size C. decreased pixel size D. increased pixel bit depth

D. contrast resolution

The ability of the imaging system to distinguish between small objects that attenuate the x-ray beam similarly defines: A. dynamic range B. grayscale C. insufficient detective quantum efficiency D. contrast resolution

D. a and c only

The visibility of anatomic structures is increased with: A. increased contrast-to-noise ration (CNR) B. increased quantum noise C. increased signal-to-noise ration (SNR) D. a and c only

C. fog

Unwanted scatter exposure to the image receptor will likely increase: A. unsharpness B. brightness C. fog. D. saturation

D. a and c

Visibility factors of a quality radiograph include: A. brightness B. spatial resolution C. contrast D. a and c

A. exposure indicator

What feature provides a numeric value indicating the level of radiation exposure to the digital image receptor? A. exposure indicator B. saturation C. pixel density D. grayscale

D. dynamic range

What is defined as "The range of exposure intensities an image receptor can accurately detect'? A. resolution B. contrast C. window level D. dynamic range

B. saturation

Which of the following results in a poor-quality digital image because of improper processing due to extreme over exposure to the image receptor. A. distortion B. saturation C. quantum noise D. modulation transfer function