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MRID 1120 - Cross Sectional Anatomy > Introduction to Cross Sectional Imaging > Flashcards

Introduction to Cross Sectional Imaging Flashcards

1
Q

Axial Plane

A
  • Separates body into superior and inferior parts

- Allows for correlation to CT images

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2
Q

Sagittal

A
  • Separates body into left and right parts
  • Directly midline is known as midsagittal
  • Often done first to help plan other planes/images
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3
Q

Coronal

A
  • Separates the body into anterior and posterior

- Not done routinely

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4
Q

Oblique

A

Passes diagonally between the axes of 2 other planes

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5
Q

SNR

A

Signal to noise ratio

  • Ratio of the amplitude of the signal received to the average amplitude of the noise
  • Noise represents random frequencies in space and time
  • Greater the signal, greater the image quality
  • Higher SNR is good
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6
Q

Does MRI signal have to be sacrificed for another variable?

Ex: To get more resolution, do we need to lower the signal?

A

Yes

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7
Q

CNR

A

Contrast to noise ratio
Contrast:
- Difference in relative brightness between pixels
- Measured by the eye’s ability to distinguish areas of high and low signal

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8
Q

High Contrast

CNR

A

Drastic difference between the signals

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9
Q

Low Contrast

CNR

A

Little difference between the signals

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10
Q

Spatial Resolution

A

Number of pixels contained in an image

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11
Q

Are MRI images scanned in 3D?

A

Yes

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12
Q

Voxel

A

Volume of tissue within the patient, and is determined by the pixel area and the slice thickness

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13
Q

What are the 3 image weightings? What’s the purpose of different weightings?

A

T1
T2
FLAIR

Different weightings give us different contrast/appearance

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14
Q

Hyperintense (image weighting)

A

High signal

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15
Q

Hypointense (image weighting)

A

Low signal

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16
Q

Isointense (image weighting)

A

Same signal qualities

17
Q

T1 Image Weighting

A 
Fat = Bright (hyper intense)
Fluid = Dark (hypo intense)
White matter = Bright
Grey matter = Dark
Air = Dark
18
Q

T2 Image Weighting

A 
Fat = Bright
Fluid = Bright
White matter = Dark
Grey matter = Bright
Air = Dark
19
Q

What does FLAIR stand for?

A

Fluid attenuated inversion recovery

20
Q

Flair Image Weighting

A 
Fat = Bright
Fluid = Suppressed
White matter = Dark
Grey matter = Bright
Air = Dark
21
Q

Purpose of the different image weightings?

A 
T1 = Anatomy
T2 = Pathology
Flair = Brain scans

MRID 1120 - Cross Sectional Anatomy (1 decks)

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