Deck 9: Health Informatics in Imaging

Question 1

Dynamic data acquisition during a multiple gated acquisition is linked to the

A)P wave.
B)R wave.
C)SA node.
D)Q wave.

Answer 1

R wave.

Question 2

When using nine-point image smoothing, all of the following is true EXCEPT

A)there is a slight increase in image resolution.
B)there is a slight decrease in image resolution.
C)there is a blending of pixel values.
D)it creates a more aesthetic image.

Answer 2

there is a slight increase in image resolution.

Question 3

If a pixel can contain only 1 byte of information, and if the counts per pixel reaches 256 counts, pixel rollover may occur and would result in the

A)averaging of all of the subsequent counts before storage.
B)addition of the subsequent counts to the pixel counts.
C)pixel value going back to 0.
D)spillage of counts into the adjoining pixel.

Answer 3

pixel value going back to 0.

Question 4

In an 8-bit color image, the range of displayed color intensities would be

A)0 to 64.
B)0 to 100.
C)0 to 128.
D)0 to 255.

Question 5

In an imaging computer system, the analog-to-digital converter (ADC) allows for the

A)localization of the appropriate pixel into which the gamma event is recorded.
B)averaging of the x, y, and z pulses.
C)processing of the energy pulse by the pulse-height analyzer.
D)conversion of x and y information into analog format.

Question 6

The image density for each pixel is determined by

A)the gamma-ray counts stored within a pixel.
B)the ratio of the z pulse to the x and y pulse.
C)the counts detected minus the rollover counts.
D)size of the matrices in which the pixels configured.

Question 7

Hardware magnification or zoom

A)decreases resolution.
B)increases noise.
C)only increases image size.
D)increases sensitivity.

Question 8

Interpolation results in a loss of image data.

Question 9

Digital Imaging and Communications in Medicine (DICOM) is the standard for

A)analog to digital conversion.
B)filtering software.
C)the system in each hospital for archiving EHRs.
D)data set-up to allow for image transfer among systems.

Question 10

The quality of the cardiac data during a MUGA can be compromised by

A)breathing.
B)bradycardia.
C)tachycardia.
D)PVCs.

Question 11

When using list mode to acquire a gated cardiac study, all of the following are true EXCEPT

A)a significant amount of disk space is required to store the data.
B)physiological markers are placed in the list of data.
C)calculations can be made from selected data.
D)timing marks are not needed for data collection.

Question 12

On a computer, image resolution

A)deteriorates as the acquisition matrix size increases.
B)deteriorates as the acquisition matrix size decreases.
C)remains consistent across matrix size for a given camera.
D)remains consistent across matrices if pixel rollover is controlled.

Question 13

When using temporal smoothing

A)noise is removed without loss of spatial resolution.
B)noise is removed with a slight loss of spatial resolution.
C)noise is not removed, but there is a slight increase in spatial resolution.
D)results are the same as nine-point image smoothing except it is applied to dynamic studies.

Question 14

A 256 * 256 matrix has a smaller pixel size than does a 64 * 64 matrix.

Question 15

Software magnification

A)increases resolution.
B)decreases noise.
C)only increases image size.
D)increases sensitivity.