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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
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A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
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[RADIONUCLIDE THERAPY OF NEUROENDOCRINE TUMORS - IMPROVEMENTS IN THE PROTOCOL FOR MEASUREMENT OF PATIENT RADIATION

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|July 15, 2021
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Predicting kidney absorbed dose after [177Lu]-DOTA-TATE Peptide Receptor Radionuclide Therapy (PRRT) is crucial. Early dose assessment after the first cycle allows safe treatment planning and reduces unnecessary scans for neuroendocrine tumor patients.

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Area of Science:

  • Nuclear Medicine
  • Radiopharmacology
  • Oncology

Background:

  • Peptide Receptor Radionuclide Therapy (PRRT) using [177Lu]-DOTA-TATE is effective for neuroendocrine tumors (NETs).
  • Personalized dosimetry is essential to monitor organ doses, particularly to the kidneys, staying below a 25 Gy safety threshold.
  • Post-treatment scans (PTS) are standard after each cycle for dose calculation.

Purpose of the Study:

  • To evaluate the predictive accuracy of the kidney absorbed dose after the first PRRT cycle.
  • To determine if this early dose can predict the cumulative kidney dose after 3 or 4 treatment cycles.
  • To propose an algorithm for simplified kidney dose monitoring in PRRT.

Main Methods:

  • Retrospective analysis of 187 patients undergoing [177Lu]-DOTA-TATE PRRT.
  • Correlation analysis between kidney absorbed dose after the first cycle and cumulative dose after 3-4 cycles.
  • Multilinear regression used to develop a predictive algorithm for kidney dosimetry.

Main Results:

  • If the kidney absorbed dose after the first cycle is < 5.6 Gy, four cycles can be safely administered (< 25 Gy cumulative dose).
  • For other patients, cumulative kidney dose can be predicted after the second cycle.
  • The proposed protocol reduced SPECT/CT studies by 34% and hospitalization by 56% per cycle.

Conclusions:

  • An algorithm simplifies kidney absorbed dose assessment in PRRT.
  • Early decisions on therapy cycle numbers were enabled for 75% of patients.
  • This approach optimizes treatment planning and resource utilization in PRRT for NETs.