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Feasibility of simplifying renal dosimetry in 177Lu peptide receptor radionuclide therapy

Författare:
  • Anna Sundlöv
  • Johan Gustafsson
  • Gustav Brolin
  • Nadja Mortensen
  • Rebecca Hermann
  • Peter Bernhardt
  • Johanna Svensson
  • Michael Ljungberg
  • Jan Tennvall
  • Katarina Sjögreen Gleisner
Publiceringsår: 2018-12-01
Språk: Engelska
Publikation/Tidskrift/Serie: EJNMMI Physics
Volym: 5
Nummer: 1
Dokumenttyp: Artikel i tidskrift
Förlag: Springer Open

Abstract english

Background: Recently, 177Lu-dotatate therapy for neuroendocrine tumours has received regulatory approval. Dosimetry can be used to optimize treatment on an individual basis, but there is no international consensus as to how it should be done. The aim of this study is to determine a feasible and accurate dosimetry method to guide individualized peptide receptor radionuclide therapy (PRRT) for patients with neuroendocrine tumours. As part of a clinical trial on 177Lu-dotatate therapy, renal dosimetry was performed for all patients in each treatment cycle, using a hybrid planar-SPECT/CT method. In the present study, we use the image data acquired from 22 patients and 119 cycles and define a set of alternative treatment planning strategies, each representing a simplification in terms of image acquisition and dosimetric calculations. The results from the simplified strategies are compared to the results from the protocol-prescribed hybrid planar-SPECT/CT-based method by analysing differences both in per-cycle and total cumulative absorbed dose (AD) analyses. Results: In general, the SPECT-based methods gave results that were largely consistent with the protocol-specified hybrid method, both in the per-cycle and cumulative AD analyses. Notably, performing one SPECT/CT per cycle at 96 h yielded ADs that were very similar to the protocol method. The methods using planar dosimetry resulted in larger variations, as expected, while giving 4 cycles to all patients resulted in the largest inter-individual differences in cumulative AD. Conclusions: Performing one SPECT/CT at 96 h in every treatment cycle gives sufficiently reliable dosimetric results to base individualized treatment planning on, with a reasonable demand on resources.

Keywords

  • Radiology, Nuclear Medicine and Medical Imaging
  • 177-Lutetium
  • Dosimetry
  • Dotatate
  • Neuroendocrine
  • PRRT
  • SPECT

Other

Published
  • ISSN: 2197-7364
Michael Ljungberg
E-post: michael [dot] ljungberg [at] med [dot] lu [dot] se

Professor

Medicinsk strålningsfysik, Lund

+46 46 17 35 65

+46 70 817 31 15

SUS Lund Kampradhuset 12-11

Barngatan 2:1, Lund

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Avdelningschef

Medicinsk strålningsfysik, Lund

32

Avdelningsföreståndare

Medicinsk strålningsfysik, Lund

32

Projektledare

Nuclear Medicine Physics

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