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Related Concept Videos

Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Radiosynthesis, Quality Control, and Small Animal Positron Emission Tomography Imaging of 68Ga-Labelled Nano Molecules
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Yttrium-90 quantitative phantom study using digital photon counting PET.

Joey Labour1,2, Philippe Boissard3, Thomas Baudier4,3

  • 1CREATIS; CNRS UMR 5220; INSERM U 1044; Université de Lyon; INSA-Lyon; Université Lyon 1, Lyon, France. labour@creatis.insa-lyon.fr.

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Summary
This summary is machine-generated.

Optimizing reconstruction parameters for Yttrium-90 (90Y) dosimetry with digital photon counting PET/CT improves accuracy. Reconstruction settings, particularly iterations and subsets, depend on sphere size for precise Yttrium-90 (90Y) dose calculations.

Keywords:
Digital photon countingDosimetryListmode reconstructionMonte Carlo simulationPETRadioembolisation

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Area of Science:

  • Nuclear Medicine
  • Medical Physics
  • Radiochemistry

Background:

  • Positron Emission Tomography (PET) imaging of Yttrium-90 (90Y) microspheres post-radioembolization is challenging due to low positron emission statistics.
  • Silicon photomultiplier-based PET systems offer improved 90Y image quality over conventional photomultiplier tubes.

Purpose of the Study:

  • To evaluate reconstruction parameters for digital photon counting PET/CT to enhance quantitative accuracy in 90Y dosimetry.
  • To assess the impact of phantom configurations and acquisition lengths on 90Y dosimetry.

Main Methods:

  • Quantitative PET/CT scans of uniform cylindrical and body phantoms with varying 90Y activity concentrations.
  • Ordered Subset Expectation Maximization (OSEM) algorithm reconstructions with varied parameters, including time-of-flight and point-spread function modeling.
  • Absorbed dose calculations using voxel S-values and comparison with Monte Carlo simulations; analysis of listmode data acquisition lengths.

Main Results:

  • A 2-mm Gaussian filter provided similar dosimetric accuracy to no filter while reducing noise; larger filters are not recommended.
  • Acquisition lengths over 10 minutes per bed showed no significant impact on quantification for digital photon counting PET.
  • Reconstruction settings of 3 iterations/10 subsets are suitable for large spheres, while 1 iteration/30 subsets improve dosimetry for smaller spheres.

Conclusions:

  • The optimal combination of iterations and subsets for 90Y dosimetry is sphere-size dependent.
  • Careful consideration of imaging conditions and setup is crucial for accurate 90Y post-dosimetry with digital photon counting PET/CT.