The standard patient preparation included at least 8 hours of fas

The standard patient preparation included at least 8 hours of fasting and patients with a serum glucose level < 120 mg/dL before F-18 FDG administration. PET/CT imaging was performed 60 minutes after the injection of F-18 FDG. Sixty minutes after the administration of F-18 FDG, low-dose CT (30 mAs, 120 kV) covering the area from the base of the MLN2238 mw skull to the proximal thighs was performed for the purpose of

attenuation correction and precise anatomic localization. Thereafter, an BI 6727 emission scan was conducted in the three-dimensional mode. The emission scan time per bed position was 3 minutes and 9 bed positions were acquired. PET data were obtained using a high-resolution whole body scanner with an axial field of view of 18 cm. The average total PET/CT examination time was 30 minutes. After scatter and decay correction, PET data were reconstructed iteratively with attenuation correction and were reoriented in axial, sagittal, and coronal

slices. A row action maximum-likelihood algorithm was used for three-dimensional reconstruction. Visual assessment and quantitative analysis Experienced nuclear medicine physicians blinded to the results of other imaging modalities and the pathologic findings reviewed most the F-18 FDG PET/CT scans. The medical records, including treatment regimens, other medical imaging modalities, and fine needle aspiration biopsies, were reviewed and analyzed. Two

experienced nuclear medicine physicians independently reviewed the PET/CT images and any disagreement was resolved by consensus. To calculate the SUVmax, manually-defined circular regions of interest (ROI) were drawn on the attenuation-corrected emission images throughout the axial planes where a suspicious lesion could be delineated. Statistical analysis The association between the mean SUVmax and clinicopathologic factors was analyzed using a two-tailed Pearson’s chi-squared or Fisher’s exact test as appropriate. Differences in groups for the mean SUVmax values were tested using one-way ANOVA or the t-test as appropriate.

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