TY - JOUR
T1 - Early and delayed evaluation of solid tumours with 64Cu-ATSM PET/CT
T2 - a pilot study on semiquantitative and computer-aided fractal geometry analysis
AU - Lopci, Egesta
AU - Grizzi, Fabio
AU - Russo, Carlo
AU - Toschi, Luca
AU - Grassi, Ilaria
AU - Cicoria, Gianfranco
AU - Lodi, Filippo
AU - Mattioli, Sandro
AU - Fanti, Stefano
PY - 2017/4
Y1 - 2017/4
N2 - Objective: The aim of this study was to analyse early and delayed acquisition on copper-64 diacetyl-bisN4-methylthiosemicarbazone (64Cu-ATSM) PET/CT in a small cohort of patients by comparing semiquantitative and computer-aided fractal geometry analyses. Patients and methods: Five cancer patients, including non-small-cell lung cancer and head and neck cancer, were investigated with 64Cu-ATSM PET/CT. Participants received an intravenous injection of 64Cu-ATSM according to body size and were imaged 60 min (early) and 16 h (delayed) later on hybrid PET/CT. Reconstructed images were visualized on advanced workstations for the definition of semiquantitative parameters: standardized uptake value (SUV)max, SUVratio-to-muscle, SUVmean, hypoxic volume (HV) and hypoxic burden (HB=HV×SUVmean). DICOM data retrieved from both scans were analysed using an ad-hoc computer program to determine the mean intensity value, SD, relative dispersion, three-dimensional histogram fractal dimension and three-dimensional fractal dimension. Results: All tumour lesions showed increased uptake of 64Cu-ATSM at early evaluation, with a median SUVratio-to-muscle of 4.42 (range: 1.58-5.62), a median SUVmax of 5.3 (range: 1.9-7.3), a median SUVmean of 2.8 (range: 1.5-3.9), a median HV of 41.6 cm 3 (range: 2.8-453.7) and a median HB of 161.5 cm 3 (range: 4.4-1112.5). All semiquantitative data obtained at 1 h were consistent with the parameters obtained on delayed imaging (P>0.05). A borderline statistically significant difference was found only for SUVmax of the muscle (P=0.045). Fractal geometry analysis on DICOM images showed that all parameters at early imaging showed no statistically significant difference with late acquisition (P>0.05). Conclusion: Our findings support the consistency of 64Cu-ATSM PET/CT images obtained at early and delayed acquisition for the assessment of tumour lesions.
AB - Objective: The aim of this study was to analyse early and delayed acquisition on copper-64 diacetyl-bisN4-methylthiosemicarbazone (64Cu-ATSM) PET/CT in a small cohort of patients by comparing semiquantitative and computer-aided fractal geometry analyses. Patients and methods: Five cancer patients, including non-small-cell lung cancer and head and neck cancer, were investigated with 64Cu-ATSM PET/CT. Participants received an intravenous injection of 64Cu-ATSM according to body size and were imaged 60 min (early) and 16 h (delayed) later on hybrid PET/CT. Reconstructed images were visualized on advanced workstations for the definition of semiquantitative parameters: standardized uptake value (SUV)max, SUVratio-to-muscle, SUVmean, hypoxic volume (HV) and hypoxic burden (HB=HV×SUVmean). DICOM data retrieved from both scans were analysed using an ad-hoc computer program to determine the mean intensity value, SD, relative dispersion, three-dimensional histogram fractal dimension and three-dimensional fractal dimension. Results: All tumour lesions showed increased uptake of 64Cu-ATSM at early evaluation, with a median SUVratio-to-muscle of 4.42 (range: 1.58-5.62), a median SUVmax of 5.3 (range: 1.9-7.3), a median SUVmean of 2.8 (range: 1.5-3.9), a median HV of 41.6 cm 3 (range: 2.8-453.7) and a median HB of 161.5 cm 3 (range: 4.4-1112.5). All semiquantitative data obtained at 1 h were consistent with the parameters obtained on delayed imaging (P>0.05). A borderline statistically significant difference was found only for SUVmax of the muscle (P=0.045). Fractal geometry analysis on DICOM images showed that all parameters at early imaging showed no statistically significant difference with late acquisition (P>0.05). Conclusion: Our findings support the consistency of 64Cu-ATSM PET/CT images obtained at early and delayed acquisition for the assessment of tumour lesions.
KW - copper-64 diacetyl-bis N 4-methylthiosemicarbazone
KW - delayed imaging
KW - early imaging
KW - fractals
KW - hypoxia imaging
KW - image analysis
KW - positron emission tomography/computed tomography
UR - http://www.scopus.com/inward/record.url?scp=85014548193&partnerID=8YFLogxK
U2 - 10.1097/MNM.0000000000000656
DO - 10.1097/MNM.0000000000000656
M3 - Article
C2 - 28263239
AN - SCOPUS:85014548193
SN - 0143-3636
VL - 38
SP - 340
EP - 346
JO - Nuclear Medicine Communications
JF - Nuclear Medicine Communications
IS - 4
ER -