Diapositive 1

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Possible solutions

• Avoid bringing beams in through

the implant if possible (possible

with eg single hip implants)

• Use avoidance sectors (single

hip) or constraints (bilateral hip)

• Assign artifacts a bulk density of

water or tissue

• Use (saturated) CT number for

metal implants

• Use extended CT number (or

manufacturer data) to assign

‘actual’ metal

Co-Cr-Mo

alloy

titanium steel

atomic

composition

Co 60%

Cr 30%

Mo 5%

Ti 90%

Al 6%

Va 4%

Fe 65%

Cr 18%

Ni 12

Mo 3

ρ

[g/cm

3

]

7.9

4.3

8.1

relative

electron

6.8

3.6

6.7