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5th Semester: DI (Preeti) > Alternate Imaging: CT and MRI > Flashcards

Alternate Imaging: CT and MRI Flashcards

1
Q

CT stands for

A

Computed Tomography (CAT Scan)

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2
Q

MRI stands for

A

Magnetic Resonance Imaging

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3
Q

Imaging that depicts a slice of the body

free from superimposition of overlying structures

A

Tomography

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4
Q

What are the 3 tomographic modalities?

A

CT

MRI

US (Ultrasound)

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5
Q

A 2D tiny square that represents the average number of

a voxel of tissue

A

Pixel

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6
Q

A 3D block of tissue represented on an image matrix

by a pixel and determined by the product of

pixel size and the thickness of the scan slice

A

Voxel

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7
Q

A voxel on an MRI represents

A

signal intensity

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8
Q

A voxel on a CT represents

A

the Hounsfield unit

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9
Q

Voxels on MRI depend on

A

transverse magnetization

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10
Q

Voxels on CT depend on

A

linear attenuation coefficient of tissue

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11
Q

Which tomographic modality would you use for

soft tissue evaluation?

A

MRI

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12
Q

Which tomographic modality would you use for

bone and lung evaluation?

A

CT

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13
Q

Which tomographic modality is the Gold Standard

for thoracic metastasis?

A

CT

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14
Q

How is long scale of contrast achieved on CT?

A

WIDE window

for low contrast

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15
Q

How is short scale of contrast achieved on CT?

A

NARROW window

for high contrast

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16
Q

How is a black area on a CT described?

A

Described as:

hypodense or hypoattenuating

17
Q

How is a white area on a CT described?

A

Described as:

Hyperdense or hyperattenuating

18
Q

Why would you CT a thoracic mass?

A

To see if it has metastasized

19
Q

Which tomographic modality has

the highest levels of radiation exposure?

A

CT

20
Q

Which tomographic modality is better for soft tissue detail?

A

MRI

21
Q

How is a black area on an MRI described?

A

Described as Hypointense

22
Q

How is a white area on an MRI described as?

A

Described as Hyperintense

23
Q

What is the difference between a T1 and T2 MRI?

A

During the process of T1 relaxation,

protons reorient resulting in recovery of longitudinal magnetization.

During the process of T2 relaxation,

protons dephase (spin becomes desynchronized) resulting in decay of transverse magnetization.

24
Q

Which MRI weighted imaging technique is best for

Anatomical overview?

A

T1

25
Q

Which MRI weighted imaging technique is best for

diagnosis of pathology?

A

T2

26
Q

T1 vs. T2 MRI:

Edema is dark in ____

A

T1

27
Q

T1 vs. T2 MRI:

Edema is bright white in _____

A

T2

28
Q

T1 vs. T2 MRI:

Free fluid is ______ on T1

A

dark

29
Q

T1 vs. T2 MRI:

Free fluid is ____ on T2

A

bright

30
Q

T1 vs. T2 MRI:

Fat is ____ on T1

A

bright

31
Q

T1 vs. T2 MRI:

Fat is _______ on T2

A

intermediate gray

32
Q

What does STIR stand for?

A

Short T1 Inversion Recovery

33
Q

What does FLAIR stand for?

A

Fluid Attenuated Inversion Recovery

34
Q

What type of MRI inversion recovery technique

would you use if you wanted to

selectively suppress fat (signal void black)?

A

STIR

35
Q

What type of MRI inversion recovery technique

would you use if you wanted to

selectively suppress pure fluids (signal void black)?

A

FLAIR

36
Q

What type of MRI inversion recovery technique

was used if free fluid appears WHITE?

A

STIR

37
Q

What type of MRI inversion recovery technique

would you use if you wanted to

distinguish fat from fluids/edema?

A

STIR

(fat signal is removed,

fat appears black and edema appears white!)

38
Q

What type of MRI inversion recovery technique

would you use if you wanted to

distinguish free fluid from edema?

A

FLAIR

(Free fluids appear black and edema appears white!)

5th Semester: DI (Preeti) (13 decks)

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