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RTBC-Digital Imaging > RTBC-Digital Imaging > Flashcards

RTBC-Digital Imaging Flashcards

1
Q

Which image receptor system does not use light during exposure?

A

Direct-capture Digital Radiography (DR)

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2
Q

Which capture element is used in indirect digital radiography?

A

Cesium iodide

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3
Q

Which collection element is utilized with both direct and indirect digital radiography?

A

Thin-film transistor

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4
Q

How are signals created in computed radiography converted to a viewable image?

A

using and ADC

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5
Q

Which is true regarding marker conventions?

A

the markers should never obscure anatomy

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6
Q

Which component of the radiographic system absorbs x-rays and converts them into light?

A

indirect-capture detector

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7
Q

Which allows digital radiography (DR) to have a higher modulation transfer function (MTF) at low spatial resolution frequencies?

A

higher detective quantum efficiency (DQE)

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8
Q

What is the function of indirect capture digital radiography (DR)?

A

absorbing x-rays and converting them into light

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9
Q

What is true regarding digital radiography (DR) versus screen-film radiology?

A

DR is faster to process and DR is easier to view from multiple locations

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10
Q

Which test pattern should a radiologic technologist use to visually assess the geometric distortion in a digital display device?

A

TG 18-QC, TG 18-LPH, TG 18-LPV

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11
Q

Which test pattern is related to the luminescence response of reflected ambient light (L amb)?

A

TG 18-CT

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12
Q

Which test pattern is used for visually assessing angular dependence on a digital display device?

A

TG 18-CT

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13
Q

Which test pattern should a radiologic technologist use to visually assess nonuniformity in a digital display device?

A

TG 18-UN10

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14
Q

A radiologic technologist is evaluating the comprehensive characteristics of a digital display device using the TG 18-UNL80 test pattern. What is the radiologic technologist evaluating in this device?

A

luminance response

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15
Q

In its standards for teleradiology, the American College of Radiology (ACR) has recommended that which patterns should be used for QC purposes?

A

AAPM TG 18

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16
Q

Although the radiographer associates the patient’s identification and other data with each radiograph via the computer workstation, which image markers should still be physically placed on the image receptor (IR)?

A

right and left side markers

17
Q

Which factors increase spatial resolution in computed radiography?

A

increase in sampling frequency and decrease in phosphor layer thickness

18
Q

Which factors increase the patient radiation dose while performing computed radiography?

A

an increase in beam intensity and an increase in average beam energy

19
Q

Which of these diagnostic procedures contributes to the highest occupational exposure of radiation to personnel?

A

fluoroscopy and mobile radiography

20
Q

Which are most commonly used to diagnose a herniated nucleus pulposus?

A

Computed Tomography, Magnetic Resonance Imaging, and Myelography

21
Q

What term in digital imaging is used to describe the process the computer uses to produce a uniform brightness and contrast regardless of the exposure?

A

Automatic rescaling

22
Q

What is the subtraction technique?

A

it is a technique in which an initial image recorded during continuous fluoroscopy is subtracted from all other images produced

23
Q

After how much time does an imaging plate exposed to radiation start losing its energy when used in computed radiography?

A

10 minutes

24
Q

How is postprocessing controlled?

A

by the radiologic technologist

25
Q

What is the minimal amount of kilovolts peak (kVp) that should be present on a technique chart used for computed radiography (excluding mammography)?

A

50

26
Q

In a digital image receptor (IR), which electronic devices directly account for the plate’s ability to hold onto a charge until it is sent into the computer?

A

capacitors

27
Q

Of the four key elements of the PACS system, which focuses on connecting numerous computers together?

A

network

28
Q

What is the purpose of image compression in digital radiography?

A

easy file transfer

29
Q

What is a standard method of data storage that was developed by ACR and NEMA?

A

DICOM

30
Q

Which most accurately refers to the individual hardware elements of a digital radiography image receptor plate that detect radiation?

A

DEL

RTBC-Digital Imaging (1 decks)

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