Artefacts

Question 1

Name the artefact, cause and correction

Answer 1

BEAM HARDENING

• Physics based artefact

Question 2

Name the artefact, cause and correction

Answer 2

PARTIAL VOLUME ARTEFACT

• > differs from PV averaging
• Physics based artefact

Question 3

Name the artefact, cause and correction

Answer 3

PHOTON STARVATION

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

Question 4

Name the artefact, cause and correction

Answer 4

UNDERSAMPLING / ALIASING

• Physics based artefact

Question 5

Name the artefact, cause and correction

Answer 5

HIGH DENSITY MATERIAL ARTeFACT

• Physics based artefact

Question 6

Name the artefact, cause and correction

Answer 6

MOTION ARTEFACT

• Patient based artefact

Question 7

Name the artefact, cause and correction

Answer 7

DETECTOR FAILURE / NON-LINEARITY (Ring artefacts)

• Scanner based artefact

Question 8

Name the artefact, cause and correction

Answer 8

EDGE GRADIENT ARTEFACT

• Physics based artefact

Question 9

Name the artefact, cause and correction

Answer 9

TRUNCATION

• Physics based artefact

Question 10

Name the artefact, cause and correction

Answer 10

HELICAL ARTIFACT (Windmill)

• Physics based artefact

Question 11

Name the artefact, cause and correction

WHAT SETTINGS SHOULD BE USED TO VIEW BULLAE WITH FLUID?

Answer 11

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!

Question 12

Name the artefact, cause and correction

Answer 12

EDGE ENHANCEMENT ARTIFACT = Rebound / Uberschwinger

• > see pulmonary margin and region of epidural space
• Physics based artefact

Question 13

Name the artefact, cause and correction

Question 14

Name the artefact, cause and correction

Answer 14

Question 15

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Answer 15

Question 16

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Answer 16

Question 17

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Answer 17

Question 18

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Answer 18

Question 19

Name the artefact, cause and correction

Answer 19

Question 20

Name the artefact, cause and correction

Answer 20

GRATING LOBE -> notice not a mirror! No reflective interface, no mirroring. Rather just lateral displacement and less echoic version of liver

Question 21

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Answer 21

Question 22

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Answer 22

Question 23

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Answer 23

Question 24

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Answer 24

Question 25

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Answer 25

Question 26

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Answer 26

Question 27

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Answer 27

Question 28

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Answer 28

Question 29

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Answer 29

Question 30

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Answer 30

Question 31

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Answer 31

Question 32

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Answer 32

Question 33

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Answer 33

Question 34

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Answer 34

Question 35

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Answer 35

Question 36

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Answer 36

Question 37

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Answer 37

Question 38

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Answer 38

Question 39

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Answer 39

Question 40

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Answer 40

Question 41

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Answer 41

Question 42

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Answer 42

Question 43

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Answer 43

Question 44

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Answer 44

Question 45

Name the artefact, cause and correction

Answer 45

Question 46

Name the artefact, cause and correction

Answer 46

Question 47

Name the artefact, cause and correction

Answer 47

Question 48

Name the artefact, cause and correction

Answer 48

Question 49

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

Answer 49