Question 1

Which of the following uses photostimulable phosphors?

Accepted Answer

CR systems utilize photostimulable phosphors.

Question 2

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

Accepted Answer

The greater the number of pixels there are in an image, the greater the spatial resolution will be.

Question 3

The limiting spatial resolution is also known as the

Accepted Answer

The limiting spatial resolution, also known as the Nyquist frequency, is given by the reciprocal of twice the sampling pitch or 1/(2 F1F1F1S1F1F1F10 sampling pitch).

Question 4

Film utilized in dry laser printers uses silver _____ emulsions.

Accepted Answer

These devices were introduced in 1996 and require specialized film (photothermographic) that uses silver behenate rather than silver halide to produce the image and that is processed thermally rather than with liquid developer and fixer.

Question 5

Photoconductors convert x-ray energy into

Accepted Answer

Photoconductors convert x-ray or light energy into an electric current.

Question 6

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

Accepted Answer

The computer matrix size (i.e., the number of pixels in the matrix) is the most important component affecting spatial resolution.

Question 7

Benefits of digital PACS images do not generally include

Accepted Answer

PACS systems do not increase spatial resolution; they only archive what the original image system captured.

Question 8

The DICOM standard does not specify an image's

Accepted Answer

The DICOM standard is the protocol that allows medical imaging devices to communicate with each other electronically and has nothing to do with examination time.

Question 9

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

Accepted Answer

Primary display monitors (those used by physicians to diagnose images) should have a luminance greater than 170 nit (50 foot-lamberts), while secondary display monitors (those used by technologists) should have a luminance greater than 100 nit (30 foot-lamberts).

Question 10

The contrast ratio of a viewing monitor should be higher than

Accepted Answer

The contrast ratio is the ratio of the maximum white level (L_max) to the minimum black level (L_min), OR L_max/L_min, and should be greater than 250 (most will be at least 600 or greater).

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