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Carter: Digital Radiography and PACS

Chapter 06: Cassetteless Equipment and Image Acquisition

Test Bank

MULTIPLE CHOICE

1.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

ANS:C

OBJ:Describe the construction of direct and indirect cassetteless systems.

TOP:TFT - Thin-film transistor

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 ______ transistor.

a.

Thin-field

b.

Field-effect

c.

Thin-film

d.

Field-energy

ANS:B

OBJ:Describe the construction of direct and indirect cassetteless systems.

TOP:FET - Field-effect transistor

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

a.

Line scanning sequence

b.

Readout

c.

Amplification

d.

Analog-to-digital conversion

ANS:A

OBJ:Describe the construction of direct and indirect cassetteless systems.

TOP:Silicon integrated circuits

4.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

ANS:D

OBJ:Describe the construction of direct and indirect cassetteless systems.

TOP:Indirect conversion

Copyright © 2008 by Mosby, Inc. an affiliate of Elsevier Inc.

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