Deck 8: Digital Radiographic and Fluoroscopic Systems and Advanced Imaging Equipment

Question 1

Which of the following uses photostimulable phosphors?

A) Indirect conversion DR system
B) Direct conversion DR system
C) CR systems
D) Flat panel fluoroscopic systems

Answer 1

C
CR systems utilize photostimulable phosphors.

Question 2

Going from a 256 * 256 to a 512 * 512 matrix doubles an image's

A) spatial resolution.
B) pixels.
C) gray levels.
D) contrast resolution.

Answer 2

spatial resolution.

Question 3

The limiting spatial resolution is also known as the

A) modulation transfer function.
B) Nyquist frequency.
C) fill factor.
D) detective quantum efficiency.

Answer 3

B
The limiting spatial resolution, also known as the Nyquist frequency, is given by the reciprocal of twice the sampling pitch or 1/(2  sampling pitch).

Question 4

Film utilized in dry laser printers uses silver _____ emulsions.

A) bromide
B) iodide
C) behenate
D) sulfide

Question 5

Photoconductors convert x-ray energy into

A) light energy.
B) heat energy.
C) radiofrequencies.
D) electric current.

Question 6

The most important component affecting the spatial resolution in digital subtraction angiography is the

A) focal spot size.
B) image intensifier.
C) television camera.
D) computer matrix size.

Question 7

Benefits of digital PACS images do not generally include

A) convenient storage.
B) image transmission.
C) computer-aided diagnosis.
D) improved spatial resolution.

Question 8

The DICOM standard does not specify an image's

A) matrix depth.
B) bit depth.
C) display settings.
D) examination time.

Question 9

CRT monitors for viewing digital images by the technologist should have a luminance value higher than ____ nit.

A) 100
B) 170
C) 1500
D) 3500

Question 10

The contrast ratio of a viewing monitor should be higher than

A)100.
B)170.
C)250.
D) 500.