Cassette-Less Equipment And Image Acquisition

Front 1

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

Back 1

Thin-flim

Front 2

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 ____ trasnsistor

Back 2

Field-effect

Front 3

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

Back 3

Line scanning sequence

Front 4

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

Back 4

X-rays to visible light

Front 5

Indirect conversion in flat-panel detectors is a ____ -step process

Back 5

Two

Front 6

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

Back 6

Amorphous silicon detector

Front 7

Cesium iodide detectors use _____.

Back 7

rare-earth scintillators

Front 8

In cesium iodide detectors, _____.
-There is a great deal of light spread
-Crystalline needles block light from the detector
-Light hitting the photodiode reduces the charge
-light spread causes resolution to decrease

Back 8

Light hitting the photodiode reduces the charge

Front 9

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

Back 9

Charged couple device

Front 10

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

Back 10

Charge-coupled device

Front 11

When specialized pixels in a complementary metal oxide silicon system are struck with x-ray photons, _____.
-The x-ray photons are converted into light
-light photons are stored in capacitors
-light photons are converted into electrical charges
-all of the above

Back 11

all of the above

Front 12

Detective quantum efficiency is a measurement of the ____.

Back 12

Percentage of x-rays absorbed

Front 13

Digital imaging systems have _____ DQE latitude than screen/film systems

Back 13

Wider

Front 14

Which of the following have the greatest DQE?
-Film/screen systems
-cassette-based radiography
-cassette-less radiography
-all have the same DQE

Back 14

cassette-less radiography

Front 15

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

Back 15

Fill

Front 16

Detectors must be _____.
-Smaller than the area to be imaged
-As large as possible
-Large enough to cover the area to be imaged
-the same size for every part to be imaged

Back 16

Large enough to cover the area to be imaged

Front 17

Which of the following has the greatest spatial resolution?
-Film/screen
-indirect digital detectors
-direct digital detectors
-spatial resolution is the same for all systems

Back 17

Film/screen

Front 18

Excessive digital processing can lead to _____.

Back 18

High noise

Front 19

Pixel pitch refers to the _____

Back 19

Space between pixels

Front 20

The larger the matrix, the _____
-larger the image
-more storage space needed
-both A and B
-neither A or B

Back 20

both A and B

Front 21

True or False: More pixels always mean better resolution

Back 21

False

Front 22

Which of the following will increase resolution?
-small matrix, large pixels
-small matrix, small pixels
-large matrix, large pixels
-large matrix, small pixels

Back 22

large matrix, small pixels

Front 23

The main factor that limits quality in cassette-less image acquisition is _____.

Back 23

Noise

Front 24

True or False: Electronic memory artifact occurs when exposures are taken in too rapid a sequence.

Back 24

True