RT Journal Article SR Electronic T1 Dose Mapping After Endoradiotherapy with 177Lu-DOTATATE/DOTATOC by a Single Measurement After 4 Days JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 75 OP 81 DO 10.2967/jnumed.117.193706 VO 59 IS 1 A1 Heribert Hänscheid A1 Constantin Lapa A1 Andreas K. Buck A1 Michael Lassmann A1 Rudolf A. Werner YR 2018 UL http://jnm.snmjournals.org/content/59/1/75.abstract AB Dosimetry of organs and tumors helps to assess risks and benefit of treatment with 177Lu-DOTATATE/DOTATOC. However, it is often not performed in clinical routine because of additional efforts, the complexity of data collection and analysis, and the additional burden for the patients. Aiming at a simplification of dosimetry, we analyzed the accuracy of a theoretically substantiated approximation, which allows the calculation of absorbed doses from a single measurement of the abdominal activity distribution. Methods: Activity kinetics were retrospectively assessed from planar images in 29 patients with neuroendocrine tumors (NETs; n = 21) or meningioma (n = 8) after the administration of 177Lu-DOTATATE (n = 22) or 177Lu-DOTATOC (n = 7). Mono- or biexponential functions were fitted to measured data in 54 kidneys, 25 livers, 27 spleens, and 30 NET lesions. It was evaluated for each fit function how well the integral over time was represented by an approximation calculated as the product of the time tl of a single measurement, the expected reading at time tl, and the factor 2/ln(2). Tissue-specific deviations of the approximation from the time integral were calculated for time points tl of 24, 48, 72, 96, 120, and 144 h. Results: The correlation between time integral and approximation improved with increasing time tl. Pearson r exceeded 0.95 for a tl of 96 h or more in all tissues. The lowest maximum errors were observed at a tl of 96 h, with deviations of the approximation from the time integral of median +5% (range, −9% to +17%) for kidneys, +6% (range, −7% to +12%) for livers, +8% (range, +2% to +20%) for spleens, and +6% (range, −11% to +16%) for NET lesions. Accuracy was reduced for measurements after 72 or 120 h. For measurements after 24, 48, and 144 h, the approximation led to large deviations for some of the patients, in particular unacceptable underestimates of the absorbed dose to the kidneys. Conclusion: A single quantitative measurement of the abdominal activity concentration by SPECT/CT 4 d after the administration of 177Lu-DOTATATE/DOTATOC provides a 3-dimensional dose map and can be used to estimate the doses actually absorbed in the treatment cycle with minor additional resources and effort.