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Technical Note: Virtual CT for reducing CT dose in targeted radionuclide therapy dosimetry.

Tiantian Li1, Greta S P Mok1,2

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Summary

A novel virtual CT (vCT) method improves targeted radionuclide therapy (TRT) dosimetry using only one CT scan. This approach enhances accuracy and reduces radiation exposure compared to conventional single CT methods.

Keywords:
SPECT/CTimage registrationinternal dosimetrytargeted radionuclide therapy

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Radiotherapy Physics

Background:

  • Sequential CT scans improve nonrigid registration for 3D targeted radionuclide therapy (TRT) dosimetry.
  • Sequential CTs are often unavailable due to radiation concerns, limiting dosimetric accuracy.
  • A virtual CT (vCT) method is proposed to overcome limitations of single CT acquisition.

Purpose of the Study:

  • To develop and validate a virtual CT (vCT) method for attenuation and scatter correction, image registration, and segmentation.
  • To improve dosimetric accuracy in TRT using a single CT acquisition.
  • To evaluate the vCT method's performance against real CT (rCT) and conventional single CT (1CT) protocols.

Main Methods:

  • Simulations using nine XCAT phantoms with varying In-111 Zevalin biokinetics and anatomy.
  • SPECT/CT acquisitions simulated at multiple time points (1-144 h postinjection) with realistic physics modeling.
  • Investigated three vCT generation methods (SPECT-SPECT, SPECT-CT, CT-SPECT) and optimal single CT timing.

Main Results:

  • SPECT-SPECT registration using the first time point's CT yielded the lowest difference and NMSE for vCT generation.
  • vCT organ absorbed doses closely matched rCT and were superior to 1CT (e.g., liver: -0.24% vs -0.49% vs -6.37%).
  • Dose-volume histograms (DVHs) showed improved accuracy with vCT compared to the conventional 1CT protocol for all organs.

Conclusions:

  • The optimized vCT method significantly enhances TRT dosimetric accuracy when only a single CT scan is available.
  • vCT reduces the radiation burden associated with repeated CT scans in sequential imaging protocols.
  • This method offers a viable solution for improving dosimetry in TRT under practical imaging constraints.