CTE Sessions at EANM’15

EANM’15 – Mini Course II

October 11, 2015, 15:45 – 16:45
EANM–TC/SNMMI–TS Joint Session
PET-CT Artefacts

Chairperson: L. Camoni (Brescia), A. Santos (Lisbon)


Speakers
extended
abstract
L. Lezaic (Ljubljana):
PET/CT Artefacts
L. Lezaic (Ljubljana):
PET/CT Artefacts Caused by Scanning Condition


Educational objectives:

  1. To present image artifacts caused by damage to hardware failures and corrective data.
  2. To understand specific of the PET/CT imaging, mainly due to the use of data for AC PET/CT images.
  3. To present image artefacts arise from suboptimal patient preparation and handling of activity prior to or during the examination.
  4. The role of the technologist in the identification and elimination of artifacts in PET/CT imaging.


Summary:

For accurately quantifiable PET images necessitates optimal operation of PET hardware as well as the application of a range of software algorithms that correct for variable, missed and unwanted detected events. The PET/CT imaging has presented several challenges that affect the accuracy of PET quantification. These challenges are primarily rooted in the use of CT for the AC of the PET data and necessitate specialized image processing algorithms to mediate their effects on the resultant PET images. Examples of these challenges include the effects of high density material, such as oral and intravenous contrast media or metal implants, on CT numbers; truncation effects due to the mismatch between the CT and PET FOVs; and a temporal mismatch between the PET and CT data acquisition and its effect on the internal structures that are affected by involuntary motion. In addition to issues with the hardware and data processing, image artefacts may arise from suboptimal patient preparation and handling of activity prior to or during the examination. Proper patient instruction, preparation and handling prior to and during the examination are key to a diagnostically useful examination.


Key Words:

PET/CT, algorithms, artefacts, examination

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