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My Mosbys Study Questions > Image Production > Flashcards

Image Production Flashcards

1
Q

For a given ct acquisition the calculated mas applied to each reconstruction slice may be referred to as

A

Effective mas

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2
Q

When using a 3rd generation ct scanner it is important that reference detectors positioned at the peripheral portions of the detector array be exposed to

A

Unattenuated radiation

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3
Q

What two scientists got the Nobel prize in 1979

A

Hounsfield and cormack

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4
Q

Which of the following terms accurately describes the type of Xray beam used in a 3rd gen ct scanner

A

Fan beam

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5
Q

Decreased mas will do what to patient radiation dose

A

Decrease

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6
Q

In MSCT the beam pitch is equal to the table feed per rotation divided by the

A

Total collimation

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7
Q

In an MSCT system the detector array is composed of multiple rows of individual detector elements along the

A

Z-axis

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8
Q

The type of MSCT detector array that contains midline narrow elements flanked by wider detectors is called

A

Hybrid array

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9
Q

The process of scanning a phantom device of known density to improve the accuracy of CT attenuation measurement is

A

Calibration

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10
Q

Which of the following types of image reconstruction was used in the first prototype ct scanner

A

Iterative technique

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11
Q

Ct images that have been reconstructed from a portion of the data acquisition process in the hopes of reducing pt motion artifacts are called

A

Segmented images

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12
Q

As a solid state ct detector measures transmitted radiation it emits a proportional response in the form of

A

Analog signal

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13
Q

During a ct scan each sample of ray sum measurements made by the data acquisition system DAS is called

A

View

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14
Q

The ability of an object to attenuate the Xray beam is assigned a value known as

A

Linear attenuation coefficient

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15
Q

The primary advantage of an isotopic MDCT data set is

A

High quality multiplanar reformations

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16
Q

The technique that allows the user to select the range of pixel values used in a 3D ct reformation is termed

A

Thresholding

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17
Q

—— is part of 3D image processing

A

Surface rendering

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18
Q

How much oral contrast

A

750-1500 mls

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19
Q

C spine images require slice thickness of

A

1mm

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20
Q

—-mm required to create lower extremity reformats

A

2mm

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21
Q

Type —— dissections affect the ascending aorta

A

A

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22
Q

What is a coagulopatgy bleed

A

Head bleed caused from blood thinners

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23
Q

What causes a amyloid headache bleed

A

Abnormal buildup of protein A disease that may be heritage and causes person to have spontaneous small vessels to burst

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24
Q

What is the main part of the CT’s computer system

A

Array processor

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25
Q

What is pitch

A

The distance the table travels during 1 revolution

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26
Q

Pitch ratio is

A

When the tube revolution equals the slice thickness is 1:1

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27
Q

Filament size has an impact on

A

Special resolution

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28
Q

—- is the ability to distinguish between objects that differ in density

A

Special resolution

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29
Q

—- detectors are used used primarily in 3rd gen scanners

A

Gas ionization

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30
Q

Voxel size depends on

A

Slice thickness (z axis)

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31
Q

MIP uses

A

Volume rendering

32
Q

Volume rendering uses data from a

A

2d projection to produce a 3D image

33
Q

A volume of tissue or volume element is a

A

Voxel

34
Q

The z axis is

A

Longitudinal

35
Q

Perfect image has a

A

1.0

36
Q

Imperfect image has

A

0.1

37
Q

The Y axis is the

A

AP image or up and down

38
Q

The frequency response to create an image

A

MTF

39
Q

HU number for hepatic cysts

A

0-20

40
Q

HU number for normal brain

A

15-22

41
Q

HU for muscle

A

50

42
Q

HU for air

A

-600 to -1000

43
Q

PET scans measure

A

The uptake of PDG

44
Q

— area of the pt that is exposed to radiation

A

Dose profile

45
Q

FWHM is a measure of

A

Effective section width

46
Q

Accounts for dose in the X Y and Z axis

A

CTWI vol

47
Q

Doesn’t matter if scan is spiral or helical

A

CTDI W

48
Q

Ct filament size

A

0.5-1.2

49
Q

Grouping together detector channels

A

Binning

50
Q

To calculate CTDI the acquisition must

A

Be contiguous

51
Q

The P way correlates to

A

Atrial systole

52
Q

The T wave correlates to

A

Cardiac diastole

53
Q

The QRS complex correlates to

A

The ventricular systole

54
Q

What is DLP

A

The total amount of exposure for an exam

55
Q

Typical kv for ct scanners

A

60-100

56
Q

Term to describe X-rays ability to ionize a volume of air

A

Exposure

57
Q

Exposure is measured in

A

Roentgens

58
Q

Amount of Xray energy absorbed in a unit of mass

A

Absorbed dose

59
Q

Absorbed dose is measured in

A

Grays

60
Q

Accounts for the type of tissue that radiation is deposited in

A

Effective dose

61
Q

Effective dose is measured in

A

Sev

62
Q

Approximate measure of dose received in a single ct slice

A

CTDI

63
Q

CTDI100 corresponds to

A

Pencil ionization chamber

64
Q

As pitch increases the dose per section

A

Decreases (CTDI VOL)

65
Q

What is displayed in all ct reports

A

DLP and CTDI

66
Q

Window width is the ———————————————

A

Range of ct numbers with in an image

67
Q

Absorbed dose is measured in

A

Gray

68
Q

Dose profile is the

A

Area of the pt that’s exposed to radiation

69
Q

MA is always increased to produce

A

Thinner images

70
Q

The peritoneum contains

A 
Stomach 
Small bowel
Small portion of duodenum
Jejunum and ileum
Transverse colon
Liver
Gb       spleen        Ovaries
71
Q

What is in the retroperitoneum

A 
Duodenum
Pancreas
Adrenals
Kidneys
Ureturs 
Bladder
Aorta.   IVC prostate uterus
72
Q

What is in the mediastinum

A

Heart. Greater vessels Esophagus.

Trachea. Phrenic and cardiac nerves. Thoracic duct. Thymus. Central chest lymph nodes

73
Q

What is spondylosis

A

Age related wear and tear of disk

L spine

74
Q

What is spondylolysis

A

Occurs to the pars

75
Q

What is spondylolisthesis

A

One vertebral body slips over another

76
Q

A ring artifact in a ct head scan would most likely be caused by

A

A detector malfunction

77
Q

The stair step artifact of 3D aortic/heart images most likely is caused by

A

Not enough overlap

My Mosbys Study Questions (3 decks)

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