Deck 16: Digital Radiography

Question 1

Scanned projection radiography was developed as a complement to ______________.

A) plain film radiography
B) computed tomography
C) magnetic resonance imaging
D) nuclear medicine

Answer 1

computed tomography

Question 2

In digital radiography, spatial resolution is improved with increased _____________.

A) field of view
B) Hounsfield units
C) pixel size
D) matrix size

Answer 2

matrix size

Question 3

Computed radiography uses (a) _____________________ for latent image formation.

A) thin film transistors
B) photosensitive silicon chips
C) photostimulable phosphor
D) semiconductor material

Answer 3

photostimulable phosphor

Question 4

Spatial resolution is determined by the ratio of ________________ to ____________.

A) matrix size, field of view
B) field of view, matrix size
C) bit depth, field of view
D) field of view, dynamic range

Question 5

The primary limitation of fanned beam radiography is ______________________.

A) reduced spatial resolution
B) long scanning time
C) low contrast resolution
D) shortened dynamic range

Question 6

What is the most recent development in digital radiography image receptors?

A) Fanned x-ray beams
B) Linear array radiation detectors
C) Photostimulable phosphors
D) Direct capture solid state devices

Question 7

Conventional x-ray tubes and cassettes are used with ________ radiography systems.

A) computed
B) scanned projection
C) direct capture
D) All of the above

Question 8

Computed radiography developed in the 1970s with the use of ___________ as the image receptor.

A) phosphor
B) selenium
C) silicon
D) film

Question 9

Digital radiography first began to be used in clinical settings in the _______.

A) 1960s
B) 1970s
C) 1980s
D) 1990s

Question 10

Digital imaging techniques are always applied to ___________________.

A) computed tomography (CT)
B) ultrasound
C) magnetic resonance imaging
D) All of the above

Question 11

Digital imaging could only be developed after advances were made in _____________.

A) microprocessors
B) semiconductor memory
C) photostimulable phosphors
D) Both A and B

Question 12

Scanned projection radiography differs from conventional radiography in the lack of ____________________________.

A) patient motion
B) spatial resolution
C) contrast resolution
D) scattered x-rays

Question 13

In digital radiography, the latent image is formed on the _______________.

A) radiographic film
B) image matrix
C) radiation detector
D) computer screen

Question 14

The dynamic range determines the degree of __________________ in the image.

A) contrast resolution
B) spatial resolution
C) motion blur
D) All of the above

Question 15

In digital radiography, the brightness of the image is determined by _______________.

A) pixel values
B) Hounsfield units
C) automatic brightness control
D) film contrast