Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

IMG 100 > Technique Exam > Flashcards

Technique Exam Flashcards

1
Q

What relationship does mAs have with density or IR exposure?

A

Direct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Does mAs have a relationship with anything else other than IR exposure?

A

Nope

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does kVp have a Direct relationship with?

A

IR Exposure but only minorly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What does kVp have a Indirect relationship with?

A

Contrast, bc the more the kVp the more the power the more the scatter, creating more greys.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is Times relationship with IR Exposure?

A

Direct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Time and Contrast?

A

Indirect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What does filtration have an indirect relationship with?

A

Contrast & IR expousre

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is Grids relationship to IR Exposure and Contrast?

A

Indirect bc increased means more led strips together meaning more absorption of scatter and primary radiation so less are making it to the board.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Collimation has a what relationship with Contrast?

A

Direct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Collimation has a what relationship with IR Exposure?

A

Indirect bc as field size is getting smaller the less skin/ body part being radiated.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What relationship does SID have with IR Exposure?

A

Indirect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Why is SID have a Direct relationship with Detail?

A

when increasing your SID your beam becomes more focused meaning it has a direct relationship. The more the the distance the more the Detail.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When increasing you SID what happens to your Size distortion?

A

It has an indirect relationship with it meaning as you SID grows your distortion size decreases.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Grid Ratio formula

A

Height over Distance H/D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Size is what?

A

Magnification

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Shape is what?

A

Elongation (angle of tube) and Foreshortening (Body part)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

OID affects contrast how?

A

The air gap, with the fizzle not reaching the IR it increases your Contrast and a direct relationship

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is Air Gapping?

A

When the IR is as close as possible it creates scatter the farther away the more the scatter fizzles out and doesn’t reach the IR.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is Quantum Model?

A

error with Digital Radiology grainy image (not enough photons have reached fix= when/if seen mAs must be increased.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is a matrix?

A

rows and columns (already set in the IR) as it increases my pixel size decrease better the quality better spatial resolution.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What relationship does Matirx have with Detail.

A

Direct the smaller the pixels the more the pixels and better detail.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Histogram Rescaling

A

comparison of 2 histograms to produce a good quality image.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is IP used for?

A

Strictly CR>

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

what does LUT stand for?

A

Look up table.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What does LUT have a relationship with?

A

It has a direct relationship with Contrast, adjustments contrast, like rescaling by making image better quality.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What is Low Pass Filtration?

A

fuzzy, increased fuzzy (blur of image)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What is bit depth?

A

number of greys

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Detective Quantum Efficiency (DQE)

A

input to output conversion, high DQE means good conversion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

DQE and MTF have what relationship?

A

Direct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

DQE and SNR have what relationship?

A

Indirect

31
Q

What is the purpose of filtration?

A

increases quality of beam by taking out weak x-rays beams, found in the tube , (protects ESE)

32
Q

What is ESE? and what does it stand for?

A

Entrance Skin Dose and highest skin dose on patient.

33
Q

When taking an image we want_____ kVp &____mAs?

A

High, low

34
Q

More kVp means?

A

means more power, better image, increased ALARA, deducing ESE?

35
Q

Why do we want low mAs?

A

less time of exposure.

36
Q

What is Noise?

A

grainy, grey, bad quality in image,

37
Q

System Noise? q

A

made in the tube

38
Q

What does image noise impair?

A

impairs diagnostic acuity.

39
Q

What is diagnostic acuity?

A

clearness of image, able to diagnose pt better.

40
Q

What does the EI# do?

A

helps determine if image was taken with correct mAs?

41
Q

What happens when you underexpose?

A

means you have less information to work with.

42
Q

What does DICOM stand for?

A

Digital Imaging & Communication of Medicine

43
Q

What is deviation Index(DI)?

A

measures the difference between how many photons should be reaching the image receptor in the relative image region for that particular study and the amount of x-ray photons that actually do reach the image receptor in the relative image region

44
Q

saturations

A

not enough photons making it to it for a diagnostic image

45
Q

What is Data Drop?

A

When there is way to much information & “gives up” over saturated, so it doesn’t show parts of image.

46
Q

Brightness

A

light on image up and down

47
Q

Contrast

A

difference in 2 adjacent densities

48
Q

Masking

A

cropping image making it smaller and removing collimation.

49
Q

Why shouldnt we mask images?

A

By law we must show entire image that was captured bc it can remove additional information (mass)

50
Q

Electronic Annotation

A

used to image acquisition conditions (markers) Ex. upright, decub, 10 mins, etc

51
Q

Diagnostic Yield

A

the amount of clinically significant information produced

52
Q

Diagnostic Efficiency

A

the faithful representation of of the patient on a medical radiograph

53
Q

Define Bit

A

bianery image

54
Q

Define Byte

A

composed of 8 bits

55
Q

What is bit depth

A

number of greys in an image

56
Q

What is DICOM?

A

Digital Imaging and communications of Medicine, its the digital standard to ensure all equipment from all manufactures who choose to adhere to the standard are speaking the same computer language.

57
Q

What is a matrix?

A

rows and columns that calculate the total number of pixels by multiplying the number of boxes.

58
Q

What is a pixel?

A

2d picture element used in radiology

59
Q

What is a voxel?

A

3d volume element used in MRI’s

60
Q

What are the 2 types of Digital Radiography?

A

DR (digital radiography) and CR (computed Radiography)

61
Q

What is CR?

A

Once exposed its put into a processer to be processed, know as 2 step bc we have to take image and
put in processer to be read.

62
Q

What is DR?

A

One step process image is sent directly to processor so it can be read.

63
Q

What does ADC stand for?

A

Analog to digital Conversion?

64
Q

What does ADC do?

A

2 step conversion Sampling: analog voltage values are measured at a chosen sample frequency, then quantification: which each sample of analog data is computed & assigned a discrete analog value and converted to a digit.

65
Q

What is analog?

A

more precise, exact value

66
Q

What digital?

A

easier to work with, gets the job done

67
Q

FOV

A

Field of View

68
Q

What is pixel pitch?

A

space between the pixels

69
Q

What is bit depth?

A

the amount of greys in an image.

70
Q

What is pre processing?

A

Point Processing , Local Processing, and Geometric Processing

71
Q

What is Point Processing?

A

adjustments of input with output images, gray scaling process which allows adjustments of brightness and contrast, creation of histogram

72
Q

Local Processing

A

High pass filtering (edge enhancement) and low pass filtering (smoothing),

73
Q

Geometric Processing

A

changing position of pixels, allows magnification and rotation,

74
Q

What are the qualities of DR?

A

Noise, Spatial Resolution, Detective quantum efficiency, & artifacts

IMG 100 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions