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Flashcards in Neurorad Anatomy Deck (16):
1

CT

  • Shape of machine?
  • How is an image produced?
  • What "windows" are used for the image?
  • What can enhance imaging?
  • Speed, availability, expense?

  • Circular gantry (donut)
  • X-rays
    • Ionizing radiation
  • Axial scan
    • Coronal & sagittal reformats
  • Iodinated contrast
  • Fast, available, expensive

A image thumb
2

MRI

  • Shape of machine?
  • How is an image produced?
  • What "windows" are used for imaging?
  • What can enhance imaging?
  • Speed, availability, and expense?
  • What are the drawbacks?

  • Cylindrical magnet (coffin)
  • Strong magnetic field, radio waves
  • Multiplanar images
  • Gadolinium contrast
  • Slower (ptmotion), less available, really expensive
  • Drawbacks:
    • safety issues with metal
    • compatibility with sick patients

A image thumb
3

What is the difference in a how a CT scan is conducted, compared to an MRI?

  • CT
    • Scan once (maybe twice if giving IV contrast)
    • View images using different “windows” (brightness and contrast settings)
      • Brain, bone, soft tissue, lung….
  • MRI
    • Scan several times (3 to 8+)
      • Multiple planes
      • Different “pulse sequences”: T1-weighted, FLAIR, etc.
    • View each image set with only one window

4

What are the strengths of a CT scan?

  1. Bone (cortex)
  2. Acute hemorrhage
  3. Trauma
  4. Fluid (e.g., CSF)
  5. +/-soft tissue

5

What are the strengths of an MRI?

  1. Soft tissues (including bone marrow)
  2. Contrast enhancement

6

What appears brighter on CT?

from brightest ⇒ bright

  1. Bone (or any metal)
  2. Hemorrhage
  3. Gray Matter > White Matter (brain)

7

What appears darker on CT?

from darker ⇒ darkest

  1. CSF
  2. Fat
  3. Air

8

What appears brighter on MRI –T1WI?

from brightest ⇒ bright

  1. Fat
  2. White Matter > Gray Matter (brain)

9

What appears darker on MRI –T1WI?

from darker ⇒ darkest

  1. CSF
  2. Air, cortical bone (no free water protons)

10

What appears brighter on MRI –T2WI?

from brightest ⇒ bright

  1. CSF
  2. Fat
  3. Gray Matter > White Matter (brain)

11

What appears darker on MRI –T2WI?

from darker ⇒ darkest

  • Air, cortical bone

12

What is totally and completely confusing to evaluate on MRI?

hemorrhage

13

Which of the MRI image scans is the best for brain anatomy?

MRI - FLAIR

14

Describe what is seen in this image:

Q image thumb

  • Bright part of the lesion ⇒ hemorrhage
  • Darker part of the lesion ⇒ edema

A image thumb
15

  • What kind of images are these?
  • What is the brightest part of the image?

Q image thumb

  • CT scans
  • Brightest part: Bone

A image thumb
16

  • What type of images are these?
  • What is the brightest part of this image?

Q image thumb

  • MRI-T2WI
  • Brightest part: CSF, fat

A image thumb