Artefact Lab
Inspect the acquisition and reconstruction clues in each scenario. Practise naming the technical issue and understanding its effect on interpretation.
What you will practise
- Recognise motion and misregistration patterns.
- Distinguish technical problems from true uptake.
- Connect a finding to the explanation in the case.
Set up your round
20 questions available
A smaller pool gives a shorter round. In timed mode, the clock sets the round length. Prompt length is a study preference, not a validated difficulty rating.
Before you begin
Open an example to revisit its answer and reasoning.
Blurring and doubling of a lesion across bed positions in a restless patient.
Answer
Motion artefact
ReasoningPatient motion blurs and duplicates structures.
A focus appears in the lung base on attenuation-corrected images but lies in the liver on non-AC images.
Answer
Respiratory misregistration
ReasoningPET–CT misregistration from breathing; compare AC and NAC.
Overestimated FDG uptake and a bright rim around a metal hip prosthesis on AC images.
Answer
Attenuation-correction (metal) artefact
ReasoningCT-based AC overcorrects near dense metal — check the NAC images.