Variability of total lesion glycolysis by 18F-FDG-positive tissue thresholding in lung cancer

E. Laffon, H. de Clermont, F. Lamare, R. Marthan
Journal of Nuclear Medicine Technology. 2013-08-05; 41(3): 186-191
DOI: 10.2967/jnmt.113.122952

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1. J Nucl Med Technol. 2013 Sep;41(3):186-91. doi: 10.2967/jnmt.113.122952. Epub
2013 Aug 5.

Variability of total lesion glycolysis by 18F-FDG-positive tissue thresholding in
lung cancer.

Laffon E(1), de Clermont H, Lamare F, Marthan R.

Author information:
(1)University of Bordeaux, Bordeaux, France.

The aim of this work was to assess the variability of total lesion glycolysis
(TLG) measurements in lung cancer patients, obtained with fixed percentages of
the maximum standardized uptake value (SUVmax) thresholds.METHODS: Thirteen
lesions (10 patients) were analyzed in 10 successive 2.5-min frames of an
(18)F-FDG PET dynamic acquisition obtained between 60 and 110 min after
injection. (18)F-FDG-positive lesion volume, associated average SUV (SUVmean),
and TLG (volume × SUVmean) were assessed in each frame using thresholds of 40%,
50%, 60%, 70%, and 80%. For each threshold, the average relative SD of TLG,
leading to relative measurement error and repeatability, was calculated over the
lesion series. The dependence of TLG variability on volume and SUVmean
variability was also assessed.
RESULTS: The average relative SD of TLG correlated strongly with threshold:
1.0866 × exp(0.0472 × threshold) (r = 0.999; P < 0.01). For the 40% threshold,
average TLG over the series was 225.9 g (range, 41.7-1,086.3), relative
measurement error and repeatability were 14.5%-20.4% (95% confidence interval),
and no significant difference was found between TLG and volume variability. For
the other thresholds, TLG variability was significantly lower or greater than
volume or SUVmean variability, respectively.
CONCLUSION: In current clinical practice, a formula allows quick estimation of
TLG variability for any percentage of the SUVmax threshold: the higher the
threshold the greater the TLG variability.

DOI: 10.2967/jnmt.113.122952
PMID: 23918613 [Indexed for MEDLINE]

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