Deck 6: Cassetteless Equipment and Image Acquisition

Question 1

Which of the following have the greatest DQE?

A)Film/screen systems
B)Cassette-based radiography
C)Cassetteless radiography
D)All have the same DQE.

Answer 1

Cassetteless radiography

Question 2

The smaller the area of the TFT photodiodes, the less radiation can be detected.

Answer 2

False

Question 3

A device that includes a photosensitive array and small pixels that convert light into electrical charges is known as a ______ transistor.

A)Thin-field
B)Field-effect
C)Thin-film
D)Field-energy

Answer 3

Thin-film

Question 4

A highly efficient indirect conversion system that takes up less fill space than CCDs is known as a ______.

A)Charge-coupled device
B)Field-effect transistor
C)CMOS
D)Thin-field transistor

Question 5

The number and size of pixels available are determined by matrix size. This is known as the ______ factor.

A)Fill
B)Size
C)TFT
D)DQE

Question 6

Detective quantum efficiency is a measurement of the ______.

A)Total number of x-rays that is absorbed
B)Percentage of light that is absorbed
C)Percentage of x-rays absorbed
D)Total amount of light that is absorbed

Question 7

A device that acts like a camera in an indirect conversion detector is known as a ______.

A)Charge-coupled device
B)Field-effect transistor
C)CMOS
D)Thin-field transistor

Question 8

The type of flat-panel detector that uses thin films of silicon integrated with arrays of photodiodes is known as a ______.

A)CsI detector
B)Charge-coupled device
C)CMOS
D)Amorphous silicon detector

Question 9

Digital imaging systems have ______.

A)Narrower DQE latitude than screen/film systems
B)Wider DQE latitude than screen/film systems
C)The same DQE latitude as screen/film systems
D)No DQE latitude

Question 10

In cesium iodide detectors, ______.

A)There is a great deal of light spread
B)Crystalline needles block light from the detector
C)Light hitting the photodiode reduces the charge
D)Light spread causes resolution to decrease

Question 11

Flat-panel detectors that use indirect conversion technology convert ______.

A)Electrical signals to light
B)Light to x-rays
C)X-rays to electrical signals
D)X-rays to visible light

Question 12

The indirect conversion detector system that requires optical coupling and image size reduction is known as a ______.

A)Charge-coupled device
B)Field-effect transistor
C)CMOS
D)Thin-field transistor

Question 13

Which of the following flat-panel detector technologies was developed by NASA?

A)Charge-coupled device
B)Field-effect transistor
C)CMOS
D)Thin-field transistor

Question 14

In a flat-panel detector, specialized silicon integrated circuits control ______.

A)Line scanning sequence
B)Readout
C)Amplification
D)Analog-to-digital conversion

Question 15

A device that acts like a switch to send electrical charges to the image processor in a direct conversion flat-panel detector is known as a ______ transistor.

A)Thin-field
B)Field-effect
C)Thin-film
D)Field-energy

Question 16

Indirect conversion in flat-panel detectors is a ______-step process.

A)One
B)Two
C)Three
D)Four

Question 17

When specialized pixels in a complementary metal oxide silicon system are struck with x-ray photons, ______.

A)The x-ray photons are converted into light
B)Light photons are stored in capacitors
C)Light photons are converted into electrical charges
D)All of the above

Question 18

A detector in which each pixel has its own amplifier is known as a ______.

A)Charge-coupled device
B)Field-effect transistor
C)CMOS
D)Thin-field transistor

Question 19

The DQE of detectors changes with changes in ______.

A)Milliampere-seconds
B)Kilovoltage peak
C)Distance
D)Temperature

Question 20

Cesium iodide detectors use ______.

A)Rare-earth scintillators
B)Thin crystalline needles
C)Miniature cameras
D)Specialized pixel sensors

Question 21

Excessive digital processing can lead to ______.

A)High resolution
B)Low noise
C)High noise
D)Low dose

Question 22

Incomplete charge transfer with cassetteless systems results in ______.

A)Inaccuracies in pixel values in subsequent exposures
B)Electronic memory artifact
C)Both A and B
D)Neither A nor B

Question 23

Which of the following will increase resolution?

A)Small matrix, large pixels
B)Small matrix, small pixels
C)Large matrix, large pixels
D)Large matrix, small pixels

Question 24

The larger the matrix, the ______.

A)Larger the image
B)More storage space needed
C)Both A and B
D)Neither A nor B

Question 25

The main factor that limits image quality in cassetteless image acquisition is ______.

A)Time
B)Heat
C)Noise
D)DQE

Question 26

Pixel pitch refers to the ______.

A)Angle of the pixel
B)Size of the pixel
C)Space between pixels
D)Tone value of pixels

Question 27

Detectors must be ______.

A)Smaller than the area to be imaged
B)As large as possible
C)Large enough to cover the area to be imaged
D)The same size for every part to be imaged

Question 28

More pixels always mean better resolution.

Question 29

Electronic memory artifact occurs when exposures are taken in too rapid a sequence.

Question 30

Which of the following has the greatest spatial resolution?

A)Film/screen radiography
B)Indirect digital detectors
C)Direct digital detectors
D)Spatial resolution is the same for all systems.