Deck 15: Computed Radiography

Question 1

Computed radiography imaging produces _____________ gray levels.

A) 30
B) 100
C) 10,000
D) 1,000,000

Answer 1

10,000

Question 2

The laser is one of the ____________ features of the computed radiography reader.

A) computer
B) chemical
C) mechanical
D) optical

Answer 2

optical

Question 3

The computed radiography image has _____________________.

A) narrow exposure latitude
B) wide exposure latitude
C) improved contrast resolution
D) Both B and C

Answer 3

Both B and C

Question 4

The computed radiography reader is made up of ______, _____, and _____ modules. I. mechanical
II) chemical
III) optical
IV) computer

A) I, II, III
B) II, III, IV
C) I, III, IV
D) I, II, IV

Question 5

Europium is the ______________ of the photostimulable phosphor.

A) image buffer
B) scintillator
C) phosphor
D) activator

Question 6

The digital imaging plate can sit for some time after the erase cycle.

Question 7

The laser beam must be less than 100 µm in diameter in order to maintain ________.

A) consistent beam shape
B) smooth image edges
C) high spatial resolution
D) high speed

Question 8

The principal source of noise in computed radiography is ____________________.

A) scatter radiation
B) background radiation
C) computer noise
D) phosphor scatter

Question 9

With computed radiography the contrast is _______________________________.

A) controlled by kVp
B) controlled by mAs
C) constant regardless of radiation exposure
D) impossible to change

Question 10

A photostimulable phosphor in a metastable state will emit light ________________. I. immediately
II) when stimulated by light
III) over time

A) I
B) II
C) II and III
D) I, II, and III

Question 11

_____________ is prevented by flooding the erased imaging plate with bright light.

A) Image fog
B) Noise
C) Overexposure
D) Ghosting

Question 12

The photostimulable phosphor screen is handled in a ______________.

A) reader
B) darkroom
C) film processor
D) film changer

Question 13

The output signal from the photostimulable phosphor plate is converted from analog to digital by the ________________.

A) optical system
B) computer controls
C) photodetector
D) drive mechanism

Question 14

Digital radiography was first introduced by ______________.

A) GE in 1998
B) Fuji in 1981
C) Kodak in 1975
D) DuPont in 1965

Question 15

The computed radiography cassette is called a(n) ______________ plate.

A) optical
B) imaging
C) laser
D) thermoluminescent

Question 16

Optical filters are used to filter out the _______ light and allow the _______ light to reach the photodetector.

A) stimulating, emitted
B) emitted, stimulated
C) emitted, monochromatic
D) stimulating, monochromatic

Question 17

Computed radiography screens respond to radiation with ______________________.

A) fluorescence
B) electron emission
C) photostimulable luminescence
D) biological phosphorescence

Question 18

The four steps of creating an image with computed radiography are ______________.

A) metastable state, stimulate, read, and erase
B) erase, stimulate, metastable state, and read
C) read, erase, stimulate, and metastable state
D) metastable state, read, erase, and stimulate

Question 19

Following the laser stimulation of the photostimulable phosphor, the excited electrons are _________________.

A) completely stabilized
B) mostly stabilized
C) still excited
D) completely removed