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S2: RADT 111 Fundamentals > Test 2 (Bush) C17-22 > Flashcards

Test 2 (Bush) C17-22 Flashcards

1
Q

A digital display monitor is best viewed ______________.

A

straight on

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2
Q

Almost all digital images in medical imaging are viewed and interpreted on a __________________.

A

digital display device

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3
Q

The ambient light at a digital image workstation should be ______________.

A

near darkness

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4
Q

T or F: The purpose of image subtraction is to enhance contrast.

A

true

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5
Q

T or F: Spatial resolution improves with the use of higher megapixel digital display devices.

A

true

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6
Q

PACS stands for _______________________________________.

A

Picture Archiving and Communication Systems

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7
Q

Which is not a part of PACS?

A

Electronic medical record

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8
Q

Radiology Information Systems (RIS) is used for which of the following?

A

Schedules, protocol descriptors, and diagnostic conclusions

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9
Q

Within a PACS network the secretarial workstation and the viewing workstation would both be called ________________.

A

clients

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10
Q

The process of remote transmission and viewing of medical images is known as ________________.

A

teleradiology

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11
Q

The national standard for image transmission in teleradiology is the ____________ format.

A

DICOM

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12
Q

The term network is used to describe the _____________.

A

manner many computers can be connected

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13
Q

What does DICOM stand for?

A

Digital Imaging and Communications in Medicine

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14
Q

T or F: Teleradiology allows for intercontinental image interpretation.

A

true

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15
Q

T or F: The Current Procedural Terminology (CPT codes), developed by the American Medical Association (AMA), created codes for a specific clinical situation.

A

true

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16
Q

Accession Numbers are specific numbers that are assigned to a patients exam they are attached to each ___________ in that exam which in turn attaches a ___________ to that specific patients exam after a radiologist has performed their dictated interpretation.

A

image , report

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17
Q

Image perception is a scientific term for what we call visual ______________.

A

sensitivity

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18
Q

The decreasing luminous intensity with increasing distance from the source of light follows _____________________.

A

the inverse square law

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19
Q

A principal advantage of digital imaging over analog imaging is ____________________.

A

image brightness

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20
Q

Light incident on the eye must first pass through the _________________.

A

cornea

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21
Q

The interpretation of a digital medical image by a radiologist is a two-step process; _________________ followed by ______________.

A

global impression; visual search

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22
Q

The process of matching any worker to the work environment to maximize efficiency is ______.

A

ergonomics

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23
Q

Digital radiography is superior to analog radiography because of __________________.

A

image brightness

24
Q

SMPTE stands for the _____________________________________.

A

Society of Motion Picture and Television Engineers

25
Q

A standard pattern made to measure the resolution of digital display systems is called the _______________________.

A

SMPTE pattern

26
Q

The standard for Digital Imaging and Communication was developed by a committee of the ______________.

A

ACR and NEMA

27
Q

There are _______ types of photometers commonly used.

A

two

28
Q

A photometer is a _____________________.

A

luminescence meter

29
Q

A high-quality medical image should always demonstrate ____________.

A

structures and tissues

30
Q

Spatial resolution improves with decreased

A

focal spot size, motion and pixel size.

31
Q

_________ is defined as the ability to distinguish anatomical structures of similar subject contrast and visually detect one from the other.

A

Contrast resolution

32
Q

Radiographic __________ is random fluctuation of x-ray interaction on the image receptor.

A

noise

33
Q

Which of the following is the principal contributor to image noise in radiographic and fluoroscopic imaging procedures?

A

Quantum mottle

34
Q

Which of the following will reduce quantum mottle?

A

High mAs, low kVp, and slower image receptors

35
Q

Higher speed image receptors generally produce images with ____________________.

A

increased noise

36
Q

The three primary geometric factors affecting image quality are ________________________.

A

magnification, distortion, and focal spot blur

37
Q

What is the formula for the magnification factor?

A

MF = SID/SOD

38
Q

The best way to minimize magnification is to use a __________.

A

long SID and small OID

39
Q

Focal spot blur can be reduced by using __________.

A

a small focal spot

40
Q

Subject contrast is affected by ___________.

A

patient thickness

41
Q

Distortion can be reduced by ____________________________.

A

placing the object plane perpendicular to the image plane

42
Q

Focal-spot blur is small on ______________ side and large on the ___________ side of the image receptor.

A

anode; cathode

43
Q

Image-forming x-rays include those which have been _________________.

A

transmitted without interaction and scattered through Compton interaction

44
Q

Which kVp selection would result in the most scattered x-rays in the image-forming beam?

A

90 kVp

45
Q

Compton scatter contributes to _____________.

A

image noise

46
Q

The three primary factors influencing the intensity of scatter in the image-forming beam are ___________________.

A

kVp, field size, and patient thickness

47
Q

Decreasing the kVp will increase ___________.

A

patient dose

48
Q

The x-rays that are transmitted through the patient without interaction contribute to ______________.

A

useful information

49
Q

Contrast resolution is improved by _____________.

A

tight collimation, lowering kVp and patient compression

50
Q

The most commonly used beam restricting device is the ____________.

A

variable collimator

51
Q

Lowering kVp ________ patient dose and _________ image contrast.

A

increases; increases

52
Q

The use of __________ improves contrast and reduces patient dose.

A

collimation

53
Q

How can you improve image contrast with a heavy patient without increasing patient dose?

A

Use tight collimation.

54
Q

Scatter radiation increases as ___________________ increases.

A

field size

55
Q

The use of a compression device will increase __________.

A

image contrast

S2: RADT 111 Fundamentals (15 decks)

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