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Related Concept Videos

Positron Emission Tomography01:29

Positron Emission Tomography

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 being...
Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

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.
Fundamental Principles of PET

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Related Experiment Video

Updated: Jun 20, 2026

Continuous Blood Sampling in Small Animal Positron Emission Tomography/Computed Tomography Enables the Measurement of the Arterial Input Function
10:21

Continuous Blood Sampling in Small Animal Positron Emission Tomography/Computed Tomography Enables the Measurement of the Arterial Input Function

Published on: August 8, 2019

Improved spatial resolution in PET scanners using sampling techniques.

Suleman Surti1, Ryan Scheuermann, Matthew E Werner

  • 1Department of Radiology, University of Pennsylvania, Philadelphia, PA 19104 USA (telephone: 215-662-7214, e-mail: surti@mail.med.upenn.edu ).

IEEE Transactions on Nuclear Science
|September 26, 2009
PubMed
Summary
This summary is machine-generated.

Two calibration techniques improve spatial resolution in positron emission tomography (PET) scanners. Inter-crystal positioning offers modest gains, while Compton scatter rejection provides larger improvements at the cost of sensitivity.

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Radiosynthesis, Quality Control, and Small Animal Positron Emission Tomography Imaging of 68Ga-Labelled Nano Molecules

Published on: October 4, 2024

Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Detector Physics

Background:

  • Advancements in Positron Emission Tomography (PET) imaging necessitate improved detector spatial resolution.
  • The use of smaller crystals in light-sharing detector designs presents calibration challenges.
  • Optimizing calibration techniques is crucial for enhancing reconstructed spatial resolution in pixelated PET detectors.

Purpose of the Study:

  • To evaluate two distinct sampling techniques for calibrating pixelated PET detectors.
  • To assess the impact of inter-crystal positioning and Compton scatter rejection on spatial resolution.
  • To compare the trade-offs between spatial resolution improvement and scanner sensitivity for each technique.

Main Methods:

  • Monte Carlo simulations and experimental measurements were conducted on two whole-body PET scanners.
  • Scintillators with effective atomic numbers (Z(eff)) ranging from 46.9 (LaBr3) to 63 (LYSO) were utilized.
  • Point source data were analyzed to quantify spatial resolution (Full Width at Half Maximum - FWHM) improvements.

Main Results:

  • The inter-crystal positioning technique improved reconstructed spatial resolution by approximately 0.5 mm (FWHM) near the scanner center.
  • In a small animal LYSO scanner, this technique enhanced resolution from 1.9 mm to 1.6 mm.
  • Compton scatter rejection yielded greater resolution gains but reduced scanner sensitivity.

Conclusions:

  • Inter-crystal positioning offers a software-based enhancement to spatial resolution with potentially longer processing times.
  • Compton scatter rejection provides significant resolution improvements, suitable for high-sensitivity scanners where resolution is paramount.
  • Both techniques represent valuable calibration strategies for optimizing PET scanner performance based on specific application needs.