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RTT Science > Exam 2 Medical Image > Flashcards

Exam 2 Medical Image Flashcards

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1
Q

What is the magnification factor?

A

Image Size/Object Size

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2
Q

Photometry is the science of the:

A

response of the human eye to visible light

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3
Q

The purpose of Digital Imaging and Communications in Medicine (DICOM) is to:

A

transfer images

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4
Q

High penetrability = High ___________ rays

A

quality

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5
Q

The IDC codes were developed by the American Medical Association.

A

False

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6
Q

___ is misrepresentation of object size & shape on the image.

A

Distortion

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7
Q

The production of heat in the anode __ directly with increasing x-ray tube current.

A

Increases

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8
Q

All of the following are types of filtration, except:

A

Compounding filters

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9
Q

What principal factors influence the shape of the x-ray emission spectrum? (Select all the apply.)

A
  1. Electrons with low KE
  2. Relatively thick target causing multiple interactions of projectile electrons with lower energy
  3. Added filtration
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10
Q

Adaptation of computer technology to mimic the human mind in cognitive activities is _______________.

A

Artificial Intelligence

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11
Q

Visibility of Image Detail is best measured by ___

A

contrast resolution

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12
Q

___ is the computer programs that tell the hardware what to do and how to store and manipulate data.

A

Software

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13
Q

The ___ changes the amplitude and shift of an X-ray Emission Spectrum.

A

kVp

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14
Q

List the stages of digital radiographing in order.

A
  1. Capture
  2. Coupling
  3. Collection
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15
Q

The probability of Compton scattering depends on the atomic number of the target atom. (T/F)

A

F

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16
Q

When assessing image quality, what would be considered a geometric factor?

A

Image Blur

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17
Q

postprocess technique, Image inversion

A

Makes Image White/Black

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18
Q

postprocess technique, Subtraction (DSA)

A

Improve image contrast

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19
Q

postprocess technique, Pixel shift

A

Correct a image for patient motion

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20
Q

postprocess technique, Region of Interest (ROI)

A

Determines average pixel value for use in quantitave imaging

21
Q

When selecting technique factors, keep exposure time as ___ as possible to ensure penetrability.

A

High

22
Q

Image Receptor sometimes referred to a ____.

A

cassette

23
Q

Bremsstrahlung x-rays have a ___of energies.

A

Range

24
Q

Flatfielding is used to

A

reduce noise & improve contrast

25
Q

PAC’s primary use is to:

A

store digital images

26
Q

Software computer components include (3)

A
  1. Bits
  2. Words
  3. Bytes
27
Q

PACS primary purpose is to

A

store and share images electronically

28
Q

Sthenic is

A

“Strong active” average patients

29
Q

Hypersthenic

A

Thin, but healthy appearing

30
Q

Hyposthenic

A

Big frame usually over weight

31
Q

Asthenic

A

Small, frail

32
Q

Increasing filtration _____________ the average energy of an x-ray beam and x-ray intensity _______________.

A

Increases, decreases

33
Q

The CPT codes were developed by the American Medical Association. (T/F)

A

True

34
Q

Process by which very high-energy x-rays can escape interaction with electrons and the nuclear electric field and can be absorbed directly by the nucleus is:

A

Photodisintegration

35
Q

Image artifacts can typically be minimized through proper alignment. (T/F)

A

False

36
Q

Absorption of an x-ray by ionization is:

A

Photoelectric Effect

37
Q

What is the relationship between x-ray intensity & mAs

A

Direct relationship

38
Q

Image inversion, a post-processing manipulation, refers to:

A

Turning white-black & black-white

39
Q

If the kVp are increased, then the electron kinetic energy will ____________.

A

increase

40
Q

Sharpness of Image Detail describes the ability to see the detail on the image. (T/F)

A

False

41
Q

What does “Annotation” do

A

Labes the images

42
Q

What does “window and level” do

A

expand digital gray scale

43
Q

What does “magnification” do

A

Improve visualization and spatial resolution

44
Q

What does “image flip” do

A

Reorient image presentation

45
Q

What characteristic of radiographic quality is improved by using reduced x-ray exposure time?

A

Motion blur

46
Q

An increase in mAs which increases the number of x-rays produced, ___________ the amplitude of the spectrum.

A

increase

47
Q

Contrast resolution refers to:

A

ability to distinguish between and to image similar tissues

48
Q

Barium is considered a ___ contrast agent.

A

positive

RTT Science (6 decks)

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