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Special Procedures > CT Chapter > Flashcards

CT Chapter Flashcards

1
Q

What is CT

A

The process of creating a cross-sectional tomographic plane of any part of the body

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2
Q

What is exit radiation measured by

A

Detector assembly

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3
Q

how does CT have less scatter

A

Fan beam uses filters to shape beam and reduce scatter

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4
Q

Who is credited with the invention of Ct

A

Godfrey hounsfield and Allen cormack

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5
Q

Most scanners are what generation

A

3rd generation

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6
Q

EBCT

A

Election beam computed tomography

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7
Q

Ebct gives increased

A

temporal resolution

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8
Q

EBCT is usually used for

A

Cardiac scans

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9
Q

6th generation CT scanner

A

Dual - source CT scanner

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10
Q

Raw dat

A

Measured X-ray transmission values

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11
Q

Volume element

A

Voxel

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12
Q

Field of view

A

Determines amount of data displayed on monitor

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13
Q

Numbers are called CT numbers or

A

Hounsfield units

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14
Q

Hounsfield units air and gas

A
  • 1000
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15
Q

Water has a hounsfield unit of

A

Zero

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16
Q

DAS

A

Data acquisition system

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17
Q

Devices within the gantry

A

X-ray tube, das, and detect array

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18
Q

Gantry can be titled up to

A

30 degrees

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19
Q

Opening of the gantry

A

Aperture

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20
Q

Table is made of

A

Low density carbon fiber composite

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21
Q

Movement of the tube is called

A

Indexing

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22
Q

Narrow window =I

A

Fewer shades of gray 08 high contrast

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23
Q

Wide window =

A

More shades of gray , longer scale contrast

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24
Q

Window level

A

Sets the mid point of gray levels

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25
Q

MPR

A

Multiplanar reconstruction

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26
Q

Multiplanar reconstruction

A

Ability to reconstruct axial images into coronal, Sagittal or oblique body planes without additional radiation to patient

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27
Q

Exam of choice for head trauma

A

Ct

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28
Q

Spatial resolution

A

Ability to see small structures that are near similar small structures

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29
Q

Contrast resolution

A

Ability to differentiate between small density differences

30
Q

Streaking artifact is also called

A

Beam hardening artifact

31
Q

Isotropic viewing

A

Viewing in all directions

32
Q

VCT

A

Volume Ct

33
Q

Smaller the beam pitch

A

Better the spatial resolution

34
Q

Isocenter

A

The point in space where radiation beams interact when gantry is rotated

35
Q

Dose reporting must be part of

A

The permanent record for each exam

36
Q

Most common reporting method

A

Dose-length product
Dose times length of exam

37
Q

Units used for DLP

A

MGy/cm

38
Q

Thinner the slice

A

The higher the dose

39
Q

what award was given to Hounsfield and Cormack and in what year

A

Nobel prize in 1979

40
Q

which generation CT machine is the tube very close to the patient, increasing the patient dose

A

4th

41
Q

6th generation computer has

A

two sets of detectors

42
Q

6th generation CT machine has increases

A

temporal resolution

43
Q

which generation uses an electron beam

A

5th generation

44
Q

what is the abbreviation for electron beam CT

A

EBCT

45
Q

which generation is dual source

A

6th

46
Q

resolution of something moving

A

temporal resolution

47
Q

which generation scanners are classified at high speed CT scanners

A

5th generation

48
Q

what beam type does a 5th generation have

A

fan beam

49
Q

what does dual energy source mean and what is the abbreviation

A

it has two x-ray beams, DSCT

50
Q

voxel volume

A

the product of the pixel area and slice thickness

51
Q

what determines the amount of data displayed on the monitor

A

field of view

52
Q

CT numbers are also called

A

Hounsfield units

53
Q

DAS

A

detector array system

54
Q

slip ring technology

A

low voltage electrical contacts within the gantry are designed to allow continuous rotation of an x-ray tube without the use of cables connecting internal and external components

55
Q

another work for voxel

A

volume unit

56
Q

gantry can be tilted how many degrees

A

30

57
Q

opening in the center of the gantry is called

A

apature

58
Q

CT table is made of

A

carbon fiber

59
Q

window width determines the number of

A

gray levels to be displayed in the image

60
Q

narrow window width results in

A

fewer shades of grey, so higher contrast

61
Q

window level determines the

A

midpoint of the range of grey levels to be displayed on the monitor

62
Q

what should the window level be set to

A

The CT number of the tissue of interest

63
Q

what should the window width be set with

A

a range of values that would optimize the contrast between the tissues in the image

64
Q

would a high-resolution CT scan protocol use thin-slice or thick-thickness protocols

A

higher resolution used thinner slice

65
Q

thinner slices increase/decrease pt dose

A

increase pt dose because of the increase in mAs

66
Q

Multiplanar reconstruction (MPR)

A

sectional image can be generated in any desired plane by selecting a particular plane of data

67
Q

Helical CT, single slice Helical CT

A

slip ring technology allows 360 degree continuous rotation of tube and detector, reduces scan times to sub-second per slice

68
Q

what does VCT stand for

A

volume CT

69
Q

VCT

A

multislice scanners with 64 detector rows or more, must be a cone configuation

70
Q

CTA

A

computed tomography angiography

71
Q

What is CTA

A

an application of spiral CT that uses three dimensional imaging techniques

72
Q

Advantages to CTA over conventional angiography

A

images can be reconstructed without additional radiation exposure, overlying structures can be eliminated, does not require arterial puncture

Special Procedures (10 decks)

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