Deck 9: Health Informatics in Imaging

Question 1

Interpolation results in a loss of image data.

Answer 1

False

Question 2

Software magnification

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

Answer 2

only increases image size.

Question 3

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.

Answer 3

deteriorates as the acquisition matrix size decreases.

Question 4

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 5

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 6

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

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

Question 7

Hardware magnification or zoom

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

Question 8

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 9

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 10

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.

Question 11

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.

Question 12

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

Question 13

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 14

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 15

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

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