Exam 9: Image Quality

To sharpen the image, a convolution process (a ramp filter) is applied to modify the frequency contents of the projection before back-projection.

To sharpen the image, a(n) ___________ process is applied to modify the frequency contents of the projection before back-projection.

Which of the following is not a source of image noise?

What is the most straightforward way to reduce or eliminate the motion of an object?

Both voluntary and involuntary motion appears as ____________ that are usually tangential to the high-contrast edges of the moving part.

Which of the following is defined as the smallest object that can be visualized at a given contrast level and dose?

What is a common disadvantage for prospective gating?

Total data acquisition time is determined by all of the following except:

In general, a high-resolution reconstruction kernel produces a(n) ______________ noise level.

All of the following are major categories of artifacts except:

Although factors affecting resolution are largely determined by CT manufacturers, operators do have a great deal of control.

The fact that noise in the reconstructed images is no longer white describes which spectrum?

What is an indication of a CT system's ability to freeze motions of the scanned object?

The averaging of all tissues in a voxel is:

One of the disadvantages of CT over conventional radiography is its ability to observe low-contrast objects whose density is slightly different from the background.

Pixel size is determined by:

Which of the following describes an object whose thickness is significantly smaller than the slice thickness of the system?

Low-contrast resolution can be measured with phantoms that contain low-contrast objects of different sizes.

All of the following factors affect in-plane spatial resolution except:

Which of the following can be used to compare the performance of different CT systems?