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RAD 122 > Test 3 > Flashcards

Test 3 Flashcards

1
Q

In digital radiography the latent image is formed on the

A

Radiation detector

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2
Q

In digital fluoroscopy each matrix pixel represents

A

Atomic number and mass density

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3
Q

In digital radiography the brightness o the image is determined by

A

Pixel values

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4
Q

Digital imaging could only be developed after advances were made in

A

Microprocessors and semiconductor memory

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5
Q

Computed radiography developed in the 1970s with the use of _______ as the image receptor

A

Phosphor

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6
Q

Scanned projection radiography was developed as a complement to

A

Computerized tomography

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7
Q

What is the most recent development in digital radiography image receptors

A

Direct capture solid state devices

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8
Q

Digital radiography first began to be used in clinical settings in the

A

1980s

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9
Q

In digital radiography spatial resolution is improved with increased

A

Matrix ️size

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10
Q

The dynamic range determines the degree of ______ in the image

A

️contrast ️resolution

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11
Q

Special ️resolution is determined by the ratio of ______to _______

A

Field of view matrix ️size

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12
Q

Scanned projection radiography differs from conventional radiography in the lack of

A

Scattered X-rays

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13
Q

In scanned beam radiography the spacial ️resolution is determined by the

A

Number of detectors

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14
Q

The primary limitation of framed beam radiography is

A

Long scanning time

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15
Q

Computed radiography used a ______ for latent image formation

A

Photostimulable phosphor

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16
Q

Conventional X-ray tubes an cassettes are used with _______ radiography systems

A

Computed

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17
Q

Direct digital uses what to convert xray to electric signal

A

Amorphous selenium

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18
Q

Direct digital benefits

A

Speed- immediate image
Better ️resolution (no diverging light)
Dose lower than CR

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19
Q

Direct digital limitations

A

Must buy new equipment
Mobile/ tabletop considerations
Scatter will create image problems

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20
Q

The science of ______ is the study of the response of the human eye to light

A

Photometry

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21
Q

What is the basic photometry can unit

A

Lumen

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22
Q

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

A

Inverse square law

23
Q

A digital display monitor is best viewed

A

Straight on

24
Q

A liquid crystal is a material in a ______ state

A

State between a liquid and a solid

25
Q

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

A

Digital display device

26
Q

A digital display device with higher megapixels has better spacial ️resolution T/F

A

True

27
Q

Almost all medical flat panel digital display devices are

A

Monochrome liquid crystal displays

28
Q

Medical flat panel display devices are identified by the

A

Number of pixels

29
Q

Compared to CRTs AMLCDs have

A

Better ️contrast
Better gray scale definition
Less intrinsic noise

30
Q

An advantage to viewing the AMLCDS screen is that the image quality is equally good viewed from any angle
T/F

A

False

31
Q

The ambient light at a digital image workstation should be

A

Near darkness

32
Q

Processing the digital image is done____ and post processing is done_____

A

Automatically

Manually

33
Q

Flat fielding is accomplished through automatic calibration images called ______ and ______

A

Offset images and gain images

34
Q

Reregistering an image to correct for pt motion is done with

A

Pixel shift

35
Q

A compilation of the mean pixel value within a region of interest is performed for

A

Quantitative radiology

36
Q

Post processing includes

A

Image inversion
Annotation
Pixel shift

37
Q

_______ is corrected by the application of an offset voltage

A

Image lag

38
Q

PACS stands for

A

Picture Archiving and Communication Systems

39
Q

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

A

Clients

40
Q

The national standard for image transmission in teleradiology is the ______ format

A

DICOM

41
Q

Text data and email are generated at a ______ workstation in PACS

A

RIS Radiology Information System

42
Q

Image file size is determined by______size and gray scale

A

Matrix

43
Q

What is the file size of an image with a 1026 x 1026 matrix and a 2.5 byte gray scale

A

2.6 MB

1026x1026=1052676x2.5=263169 bytes

44
Q

Scotopic is

A

Night vision controlled by RODS

AKA Rods vision

45
Q

Rod cells see in

A

Black and white and in dark light

46
Q

Photopic is

A

Day vision controlled by cone cells

Aka comes vision

47
Q

DICOM stands for

A

Digital Image communication in Medicine

48
Q

What is HL7

A

Software standards established for exchanging info in health care

49
Q

Two systems for film digitizes (scanners)

A

Laser

CCD linear array

50
Q

Hard copy =

Soft copy =

A

Hard - can hold in hand

Soft- viewed on monitor

51
Q

What is a CRT

A

Old school big bulky monitor

52
Q

What is LCD (AMLCDS)

A

Flat screen new school monitor

53
Q

Digital imaging techniques are always applied to

A

CT
Ultrasound
MRI

54
Q

T/F DR is hard wired to CPU

A

True

RAD 122 (3 decks)

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