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BDS4 Radiology > 5 - Other imaging modalities 2 > Flashcards

5 - Other imaging modalities 2 Flashcards

1
Q

What imaging modalities are used for bony imaging?

A
  • plain radiograph
  • CBCT
  • CT
  • MRI (for marrow changes)
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2
Q

Describe the features of CBCT.

A
  • cone/pyramid shaped beam
  • low dose
  • poor soft tissue contrast
  • image made up of voxels
  • view in three planes
  • no distortion of image from any plane
  • radiographic contrast not required
  • patient sits upright or stands
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3
Q

Describe the features of CT.

A
  • fan shaped beam
  • high dose
  • good soft tissue contrast
  • radiographic contrast can be used if indicated
  • patient lies flat
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4
Q

What is the effective dose of an intraoral radiograph?

A

4 uSv

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5
Q

What is the effective dose of a panoramic radiograph?

A

3-24 uSv

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6
Q

What is the effective dose of a CBCT?

A

Ranges depending on FOV, 11-1025 uSv

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7
Q

What is the maximum effective dose of a CT facial bones?

A

860 uSv

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8
Q

What imaging is required for the investigation of myofascial pain?

A

None

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9
Q

What imaging is required for the investigation of internal derangement of TMJ?

A
  • MRI is gold standard
  • can use US
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10
Q

What imaging is required for the investigation of degenerative TMD?

A

CBCT

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11
Q

How does MRI assist investigation of internal derangement?

A
  • disc visualised on MRI
  • direction and movement of disc can be seen
  • viewed in para-sagittal and para-coronal views
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12
Q

What is a para-sagittal view?

A

Short axis of condyle

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13
Q

What is a para-coronal view?

A

Long axis of condyle

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14
Q

What is SPECT?

A

Single photon emission CT

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15
Q

What agent is used for SPECT?

A

99mTc

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16
Q

What is SPECT used for?

A
  • joint activity
  • can view if joint is growing
17
Q

What imaging techniques are used as part of head and neck oncology?

A
  • cross sectional with contrast (CT/MRI)
  • US guided biopsy of cervical lymphadenopathy
  • PET/CT
  • OPT for dental assessment
18
Q

How does MRI compare to CT?

A
  • MRI has no radiation dose
  • MRI takes longer
  • MRI has more contraindications
  • MRI is better for assessment for perineural spread, bony changes and soft tissue characteristics
19
Q

What are contraindications for MRI?

A
  • pacemaker
  • cochlear implants
  • claustrophobia
20
Q

What is PET?

A
  • positron emission tomography
  • radioactive fluorine labelled glucose injected
  • goes to metabolically active tissues
  • laid over MRI or CT

BDS4 Radiology (12 decks)

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