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Physics > Artefacts > Flashcards

Artefacts Flashcards

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1
Q

Name the artefact, cause and correction

A

BEAM HARDENING

  • Physics based artefact
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2
Q

Name the artefact, cause and correction

A

PARTIAL VOLUME ARTEFACT

  • > differs from PV averaging
  • Physics based artefact
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3
Q

Name the artefact, cause and correction

A

PHOTON STARVATION

  • Cause: severe attenuation, loss of photons reaching detector
  • Physics based artefact
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4
Q

Name the artefact, cause and correction

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UNDERSAMPLING / ALIASING

  • Physics based artefact
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5
Q

Name the artefact, cause and correction

A

HIGH DENSITY MATERIAL ARTeFACT

  • Physics based artefact
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6
Q

Name the artefact, cause and correction

A

MOTION ARTEFACT

  • Patient based artefact
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7
Q

Name the artefact, cause and correction

A

DETECTOR FAILURE / NON-LINEARITY (Ring artefacts)

  • Scanner based artefact
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8
Q

Name the artefact, cause and correction

A

EDGE GRADIENT ARTEFACT

  • Physics based artefact
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9
Q

Name the artefact, cause and correction

A

TRUNCATION

  • Physics based artefact
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10
Q

Name the artefact, cause and correction

A

HELICAL ARTIFACT (Windmill)

  • Physics based artefact
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11
Q

Name the artefact, cause and correction

WHAT SETTINGS SHOULD BE USED TO VIEW BULLAE WITH FLUID?

A

POINT SPREAD EFFECT (also review blooming)

  • Physics based artefact
  • > Bullae with fluid: Apparent thickening -> worse when use low freq, low and narrow WW/WL due to reduced inherent contrast in this situation cf air-filled bullae which have more contrast. -> BASICALLY MAKE MORE LIKE A BONE WINDOW!
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12
Q

Name the artefact, cause and correction

A

EDGE ENHANCEMENT ARTIFACT = Rebound / Uberschwinger

  • > see pulmonary margin and region of epidural space
  • Physics based artefact
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13
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14
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15
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16
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17
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18
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19
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20
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GRATING LOBE -> notice not a mirror! No reflective interface, no mirroring. Rather just lateral displacement and less echoic version of liver

21
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35
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36
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38
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40
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41
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47
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48
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49
Q

Describe DENSITY THRESHOLD artefact (Radiography). Image not found!

A

Physics (10 decks)

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