Authors: Dimitri Papathanassiou Stéphanie Becker Roland Amir Benoît Menéroux JeanClaude Liehn
Publish Date: 2005/08/31
Volume: 32, Issue: 12, Pages: 1422-1428
Abstract
Respiratory motion has been reported to be a potential cause of artefacts on PET/CT and of errors in the quantification of lesion activity due to inaccurate attenuation correction We examined FDG images corrected for attenuation with CT and a caesium external source in the same patients to study this artefact and to assess its impact on detection of lesions in the upper part of the liverA total of 122 patients underwent the examination using both attenuation correction techniques with the Gemini PET/CT scanner No breathing instructions were given The images obtained were visually compared and standardised uptake values SUVs in 35 lesions were measured mean SUV/normal liver SUV in 14 patients with lesions in the upper part of the liver less than 5 cm from the upper borderCTcorrected images of the liver included an artefactual cold area in 84 patients 69 this area was located in the posterior upper part of the liver 65 patients 53 included the top of the liver ten patients 8 or affected both the top and the posterior part nine patients 8 In lesions and also in normal liver outside the artefactual area SUVs obtained with CT correction were higher than those obtained with Cs correction p005 though this was usually without relevance for lesion detection However in patients with lesions situated inside the artefactual area SUVs were lower with CT correction and ability to detect two lesions 6 was affected
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