Abstract
Purpose
Functional imaging of cancer adds important information to the conventional measurements in monitoring response. Serial 18F-fluorodeoxyglucose (FDG) positron emission tomography (PET), which indicates changes in glucose metabolism in tumours, shows great promise for this. However, there is a need for a method to quantitate alterations in uptake of FDG, which accounts for changes in tumour volume and intensity of FDG uptake. Selection of regions or volumes [ROI or volumes of interest (VOI)] by hand drawing, or simple thresholding, suffers from operator-dependent drawbacks.
Materials and methods
We present a simple, robust VOI growing method for this application. The method requires a single seed point within the visualised tumour and another in relevant normal tissue. The drawn tumour VOI is insensitive to the operator inconsistency and is, thus, a suitable basis for comparative measurements. The method is validated using a software phantom. We demonstrate the use of the method in the assessment of tumour response in 31 patients receiving chemotherapy for various carcinomas.
Results
Valid assessment of tumour response could be made 2–4 weeks after starting chemotherapy, giving information for clinical decision making which would otherwise have taken 9–12 weeks. Survival was predicted from FDG-PET 2–4 weeks after starting chemotherapy (p = 0.04) and after 9–12 weeks FDG-PET gave a better prediction of survival (p = 0.002) than CT or MRI (p = 0.015).
Conclusions
FDG-PET using this method of analysis has potential as a routine tool for optimising use of chemotherapy and improving its cost effectiveness. It also has potential for increasing the accuracy of response assessment in clinical trials of novel therapies.
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Acknowledgment
This work is supported by Cancer Research UK.
Conflict of interest statement
All work described here was carried out under UK law. All necessary ethical and regulatory approval was obtained.
We certify that no conflict of interest exists in relation to this paper.
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Appendix
Appendix
18F-FDG Imaging Standard Operating Procedure
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Patient asked to fast for 5 h before scan.
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Height, weight and blood glucose recorded.
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150 MBq 18 F-FDG administered i.v.
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Patient asked to rest for 90 min.
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Two or three rotation PET scan acquired using ACAC MCD system:
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32 azimuths per rotation;
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30 s per azimuth:
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Time per projection automatically adjusted for physical decay;
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Attenuation correction map acquired with projections.
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(Where patients were not able to lie still for the required time single rotation acquisitions were used.)
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OS-EM reconstruction with attenuation correction:
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Rotations “knitted” to make single torso image;
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Knitted images corrected for variations in:
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Injected activity;
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Timing of injection and scan.
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Images saved for analysis.
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Green, A.J., Francis, R.J., Baig, S. et al. Semiautomatic volume of interest drawing for 18F-FDG image analysis—method and preliminary results. Eur J Nucl Med Mol Imaging 35, 393–406 (2008). https://doi.org/10.1007/s00259-007-0602-3
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DOI: https://doi.org/10.1007/s00259-007-0602-3