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RT 204 > 9. Recorded Detail > Flashcards

9. Recorded Detail Flashcards

1
Q

is one of the 2 geometric

properties of image quality.

A

Recorded detail

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2
Q

is the degree of geometric
sharpness or accuracy of the structural lines
actually recorded in the image.

A

Recorded detail

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3
Q

Recorded detail is also referred to as

A

definition, sharpness, spatial resolution or simply detail

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4
Q

is usually quantified and even has derived

unit.

A

Detail

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5
Q

The term _______ is applied to quantified discussions of recorded detail

A

spatial resolution

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6
Q

a radiograph typically does not show soft tissue structures

A

Spatial Resolution

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7
Q

Digital image shows not only the soft tissue but also the edge of the skin

A

Spatial Resolution

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8
Q

Giving the appearance of more detail

A

Spatial Resolution

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9
Q

The primary film/screen unit of resolution is

A

line pairs per millimeter (lp/mm) or cycles per mm

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10
Q

is composed of

pairs of lines a set distance from one another

A

radiographic resolution tool

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11
Q

Digital imaging recorded detail is more commonly called

A

spatial resolution

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12
Q

is determined primarily by matrix size, pixel size,

and gray scale bit depth

A

Digital imaging recorded detail

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13
Q

is usually discussed as high or low

A

Spatial frequency

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14
Q

Shorter wavelength signal (with higher frequency) represents pairs of lines that can be visualized ______

A

very close together

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15
Q 
Low frequency spatial resolution as this signal has
longer wavelength (and lower frequency) representing pairs of lines that are \_\_\_\_\_\_
A

further apart

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16
Q

____ radiographic images have less recorded detail

than the object itself

A

ALL

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17
Q

Describes the ability of an imaging system to accurately

display objects in two dimensions.

A

Spatial Resolution

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18
Q

Higher when 2 objects can be demonstrated to be smaller or closer together

A

Spatial Resolution

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19
Q

Spatial resolution for digital images can be expressed in terms of _______ of the image

A

three dimensions

20
Q

Most medical images use a _______ region of interest in the human body BUT these images contain _______ of information.

A

two-dimensional,

three-dimensions

21
Q

high spatial resolution

represents a high-frequency signal that is capable of imaging _____ objects

A

smaller

22
Q

Low spatial resolution represents a lower

frequency signal that can only image _____ objects

A

large

23
Q

is simply background

information that the image receptor receives

A

Imaging noise

24
Q

refers to a lack of sufficient incoming data for processing

A

Quantum Noise

25
Q

the phenomena, Quantum Noise, is also called

A

Quantum Mottle

26
Q

The solution to the problem (Quantum Mottle/Noise) remains the same – increase the number of incoming signals, whether it requires increasing the
_____ of an x-ray beam (the most common solution).

A

mAs

27
Q

affects the image appearance by
demonstrating fine detail structures, often very
close to the size limits of the naked eye

A

Resolution

28
Q

is often not perceived by the beginning student, partially because students
must learn to critically examine each image in a
methodical manner

A

Motion unsharpness

29
Q

the primary
factors affecting the recorded detail of digital
imaging systems are the

A

Detector geometric properties and

Image processing system

30
Q

detector geometric

properties and the image processing system

A

Digital Image Receptor Systems

31
Q

Photostimulable phosphor systems are often called

A

Computed Radiography (CR)

32
Q

have recorded detail limitations very similar to

film/screen intensifying screen phosphor systems.

A

Photostimulable phosphor systems

33
Q

The major factors that limit photostimulable phosphor systems are the

A

Intensifying screen and

Scanning system

34
Q

Affects recorded detail because it fails to permit

enough time for a well-defined image to form

A

Motion

35
Q

under the direct control of the patient.

A

Voluntary Motion

36
Q

For all patients (children and incognizant adults
may be expected in some cases), _______ is
the best method of controlling voluntary motion

A

communication

37
Q

is not under the control of

the patient

A

Involuntary Motion

38
Q

Difficult to detect

A

Equipment Motion

39
Q

best method of reducing motion is

A

Patient communication

40
Q

When the patient is unable to cooperate, the best method is a reduction in _____ with a corresponding increase in _____ to maintain sufficient mA and film density

A

exposure time,

mA

41
Q

Other methods of decreasing exposure time while maintaining exposure include:

A

using a higher speed film and screens,

decreasing SID and increasing kVp

42
Q

When communication and
exposure time reduction are not sufficient to
reduce motion

A

Immobilization

43
Q

Last resort, human immobilizers may be used to hold the patient in position

A
  1. ) Male relatives
  2. ) Female relatives
  3. ) Nonradiology hospital personnel
  4. ) Nonprofessional radiology personnel
44
Q

mA increase

A

Density, Contrast, Resolution, and Distortion- Maintains

45
Q

kVp increase

A

Contrast- Decreases

Density, Resolution, and Distortion- Maintains

46
Q

Film/Screen Speed Increase

A

Resolution- Decreases

Density, Contrast, and Distortion- Maintains

47
Q

SID decreases

A

Density and Contrast- Maintains
Resolution- Decreases
Distortion- Increases

RT 204 (11 decks)

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