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RADT 171 - Phys. 2 > Review: All > Flashcards

Review: All Flashcards

1
Q

T/F: Digital right and left markers should be used to indicate the anatomical side imaged.

A

False

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2
Q

T/F: Overexposure will reduce the contrast resolution of the image.

A

True

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3
Q

What component of the CR reader converts light to an electronic signal?

A

Photodetector

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4
Q

What is the role of the CCD in indirect DR?

A

Converts light to electrons

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5
Q

What part to the flat-panel DR converts x-rays to light?

A

Scintillator

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6
Q

T/F: Digital imaging systems have a wide dynamic range.

A

True

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7
Q

DICOM serves what purpose in PACS?

A

Allows different systems to communicate

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8
Q

T/F: With digital systems, a higher kVp can be used than with film/screen.

A

True

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9
Q

What is the primary difference of direct DR over indirect DR?

A

lacks the conversion of x-rays to light

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10
Q

Once the image is acquired, what is the role of PACS?

  1. Display
  2. Storage
  3. Dose reduction
A

1 and 2

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11
Q

Which part of the CR reader detects light released from the PSP plate?

A

photodetector

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12
Q

The DR image capture method that uses an amorphous silicon photodetector and TFT represents which of the following?

A

Indirect

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13
Q

Delivery of hot air to the surface of the film is the function of which system?

A

Drying system

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14
Q

What part of the CR reader digitizes the signal?

A

ADC

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15
Q

T/F: Histogram analysis is the basis for determining exposure index.

A

True

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16
Q

T/F: DR image receptors do not use histograms.

A

False

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17
Q

Which of the following statements is true concerning computed radiography (CR) systems?
A. Use storage phosphors to temporarily store energy representing the image signal
B. Require that the storage phosphor undergoes a process to extract the latent image
C. Have detectors that directly capture and read out an electronic image signal

A

A and B

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18
Q

The type of phosphor found in the PSP plate for computed radiography is:

A

Barium fluorohalide

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19
Q

The part of a PSP plate that gives some rigidity to the plate is the:

A

Support layer

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20
Q

Part of a PSP plate that includes a random distribution of crystals is the:

A

Turbid phosphor layer

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21
Q

T/F: The barcode label is used by the reader to identify the PSP plate.

A

True

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22
Q

When the PSP plate is exposed to the laser of the reader, the energy is released and converted to a digital signal, becoming a:

A

Manifest image

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23
Q

Europium is the ____________ of the photostimulable phosphor.

A

Activator

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24
Q

The part of the reader that senses the light released from the PSP plate is the:

A

Photodetector

25
Q

Part of a DR system with indirect capture, the light-sensitive device that is commonly found in digital cameras is the:

A

Charge-couple device

26
Q

The scintillator for the indirect capture DR system that utilizes a CCD is:

A

cesium iodide

27
Q

Put the following sequence of events for indirect capture systems in order:
1.Electronic signal is sent to the computer work station for processing and display
2.The light energy is then transmitted to the CCD
3.The CCD converts the energy to an electronic signal
4. X-rays are absorbed by the scintillator and converted to light

A

4, 2, 3, 1

28
Q

Which of the following describes the extra step, and is therefore a limitation of indirect-capture methods?

A

x-rays are converted to light and then to electrons

29
Q

Part of the direct capture DR system, the _______ absorbs x-rays and produces an electronic signal.

A

Photoconductor

30
Q

Histogram analysis compares the histogram with pre-established histograms specific to

A

the anatomic part being imaged

31
Q

T/F: The DAP is used for DR digital systems and is a measure of the dose to the patient.

A

True

32
Q

T/F: After the digital data leaves the ADC, the process of digital image formation is very different for the three types of DR systems.

A

False

33
Q

Digital imaging quality control focuses on:
A. the display monitors
B. the viewing environment
C. the radiologist’s comfort

A

A and B

34
Q

_____ is the standard format for digital medical images

A

DICOM

35
Q

PACS stands for

A

Picture Archiving and Communication System

36
Q

Intensifying screens are used to:
A.reduce patient exposure
B.convert light photons to x-ray photons
C. convert x-ray photons to light photons

A

A and C

37
Q

The most important layer for creating the image; the layer of film that is sensitive to light or radiation is the

A

emulsion

38
Q

the ability of phosphors to emit visible light only while exposed to x-rays

A

Fluorescence

39
Q

Order for automatic film processing.

A

Developing
Fixing
Washing
Drying

40
Q

SI equivalent for RAD

A

Gray

41
Q

Grid conversion factor for 8:1 ratio grid

A

4

42
Q

SI equivalent for REM

A

Seivert

43
Q

ALARA stands for:

A

As low as reasonably achievable

44
Q

The probability of Compton scatter is related to:

A

the energy of the photon

45
Q

The number of lead lines per unit length

A

grid frequency

46
Q

These grids allow more transmitted photons to reach the IR

A

focused grids

47
Q

When using the air-gap technique, the ___ must also be increased

A

SID

48
Q

This increases brightness on fluoroscopy

A

image intensifier

49
Q

When using mag mode, voltage to the focusing lenses is:

A

increased

50
Q

AEC (automatic exposure control) determines exposure by controlling the:

A

length of exposure

51
Q

Backup time for AEC exposure should be set to:

A

150 - 200% of expected exposure time

52
Q

These devices measure part thickness

A

Calipers

53
Q

The two detector types with digital systems

A

CR and DR

54
Q

A histogram is:

A

a graph of all data points

55
Q

With digital systems, this is important to monitor to avoid dose creep

A

exposure index number

56
Q

The pixel bit depth determines the image ____

A

contrast resolution

57
Q

The numerical value indicating the level of radiation exposure to the digital IR is the:

A

Exposure indicator

58
Q

If the AEC detector is directly exposed to the primary beam during exposure, the IR exposure will be:

A

insufficient

59
Q

A technique chart should be established for:

A

each radiographic tube

RADT 171 - Phys. 2 (10 decks)

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