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CT > Computed Tomography > Flashcards

Computed Tomography Flashcards

1
Q

What kind of beam does 1st Gen CT produce?

A

Pencil Beam

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2
Q

in 1st gen, required ____ translations in _ degree increments

A

180, 1

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3
Q

which gen takes 5 minutes to complete?

A

1st

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4
Q

1st and 2nd gen CT are considered to be…

A

Translate-rotate

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5
Q

this generations of ct produces a Fan-shaped beam?

A

2 and 3

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6
Q

this gen of CT use 10 degree increments with 18 translations

A

2nd

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7
Q

How many detectors does the 2nd gen CT have?

A

5-30

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8
Q

3rd gen uses Curvilinear array, which contains….

A

Detectors and fan beam

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9
Q

what is the width of the fan shaped beam in 3rd gen?

A

30-60 degree

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10
Q

which gen of ct produces ring artifact?

A

3rd

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11
Q

4th Gen is the most different, what kind of operation does it uses?

A

Rotate-stationary

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12
Q

Major components of CT imaging system…

A

Operator console, computer, Gantry

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13
Q

Source to detector makes one sweep, this is call

A

translation

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14
Q

Computer component of CT has 2 memory methods, one is random access memory and another is long term

A

RAM and Archiving

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15
Q

what were the different types (in order) of detector arrays?

A

Gas filled detectors, replaced by Scintillation, Solid State Detectors

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16
Q

what are the 2 collimators used in CT?

A

Prepatient and Predetector collimator

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17
Q

this collimator is mounted on the x ray tube

A

Prepatient

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18
Q

how much kW is necessary for a multi slice unit?

A

50

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19
Q

Slip rings make spiral CT possible by…

A

allowing continuous spin

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20
Q

Image matrix refers to cells. Cells are called…

A

Pixels

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21
Q

what is the current matrices?

A

512x512

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22
Q

If numbers of pixels stay the same but field of view is increased, the quality is ______. If the pixels decreases with field of view increase , the quality is _____.

A

blurry, good

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23
Q

Voxel =…

A

pixel x slice thickness of image slice

24
Q 
CT numbers for the following 
Air
fat
water
gray matter
dense bone
A

-1000 to -3000
-100
0
+40
1000 - 3000

25
Q

what are the 5 principle characteristics of image quality in CT?

A

Spatial resolution, linearity, contrast resolution, Spatial uniformity, noise

26
Q

what is spatial resolution affected by?

A

pixel size and collimation

27
Q

shades of gray or ability to distinguish one soft tissue from another is a description of

A

contrast resolution

28
Q

how does noise artifact appear on CT?

A

grainy

29
Q

Linearity describes how CT should be calibrated. What method is used to test linearity?

A

Five pins test

30
Q

Ability to reconstruct an image at any Z axis position by using mathematical equation is called (using known values)

A

intrapolation

31
Q

but when you’re estimating value beyond range of known value it is called…

A

extrapolation

32
Q

Relationship between pt couch movement and x ray beam width is….

A

Pitch

33
Q

Axial Tomography is also known as

A

Conventional Tomography

34
Q

What is inside of a Gantry?

A

X ray tube, Detector array, data acquisition system, and cooling system

35
Q

This is the numeric information contained in each pixel

A

CT number/hounsfield unit

36
Q

When the source to detector parts make a scan, this is called a..

A

Translation

37
Q

when you use math to make and calculate image reconstruction, you are utilizing…

A

Algorithm

38
Q

When you’re talking about matrix decreasing in size or increasing you’re talking about…

A

field of view

39
Q

lower CT number will appear close to ____ while higher number will appear from ____ to ____

A

black, grey to white

40
Q

this bone forms the lateral walls of cranium

A

Temporal

41
Q

this bone is found in the eye hole area, right btwn maxilla and labyrinth of the ethmoid bones

A

lacrimal

42
Q

Vertebral arch is formed by…

A

2 pedicles, 2 laminae, 2 transverse process, 1 spinous process

43
Q

Trachea originates where?… and splits where?

A

C6, T4-T5

44
Q

Costophrenic angles are the ….

A

most posterior and inferior portion of the base

45
Q

what is an S shaped bone?

A

clavicle

46
Q

What bones make up the acetabulum?

A

Pubis, ilium, and Ischium

47
Q

What do you call the last cartilage ridge of the trachea

A

carina

48
Q

When did Hounsfield first demo the CT?

A

1970

49
Q

in 1979 who did Hounsfield share the Nobel Prize with?

A

Cormack, Alan

50
Q

which generation of the pt at all times?

A

3rd gen

51
Q

simplest form of 3D imaging

A

Maximum intensity projection

52
Q

Sensitivity profile is about ____ than conventional CT

A

10%

53
Q

2,000-4,000

A

body

54
Q

3,000-5,000

A

Head

55
Q

20mGy-40mGy

A

body imaging

56
Q

30mGy-50mGy

A

Head imging

57
Q

This is higher in CT than any other x ray procedure

A

ESE

CT (1 decks)

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