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Related Concept Videos

Positron Emission Tomography01:29

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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.
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Computed Tomography01:10

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Updated: Mar 8, 2026

High-Resolution Cardiac Positron Emission Tomography/Computed Tomography for Small Animals
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PET/CT: underlying physics, instrumentation, and advances.

I Torres Espallardo1

  • 1Servicio de Medicina Nuclear-Área de Imagen Médica, Hospital Universitario y Politécnico La Fe, Valencia, España.

Radiologia
|January 17, 2017
PubMed
Summary
This summary is machine-generated.

Positron Emission Tomography/Computed Tomography (PET/CT) hybrid scanners have evolved significantly, enhancing image quality and diagnostic capabilities. Advances in PET and CT components improve lesion detection and provide detailed anatomical information for clinical practice.

Keywords:
Algoritmos iterativosCentelleadores rápidosComputed tomographyDose modulationFast scintillation crystalsHybrid imagingImagen híbridaIterative algorithmsModulación de dosisMultidetector CTPETPositron emission tomographyTACTAC multidetectorTiempo de vueloTime of flight

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Area of Science:

  • Medical Imaging Physics
  • Radiological Technology
  • Nuclear Medicine

Background:

  • Hybrid PET/CT scanners were initially developed to fuse PET and CT images for improved clinical quality and alignment.
  • The integration of PET and CT has become routine, demonstrating the significant clinical utility of these hybrid systems.
  • Manufacturers have advanced beyond using CT solely for PET attenuation correction, focusing on developing high-performance PET/CT scanners with enhanced features.

Purpose of the Study:

  • To review the fundamental physics of PET and CT imaging modalities.
  • To describe advancements in instrumentation and standard protocols for combined PET/CT systems.
  • To highlight key innovations and future directions in hybrid PET/CT imaging.

Main Methods:

  • Review of underlying physics principles for both PET and CT.
  • Analysis of technological improvements in PET detectors (e.g., LYSO crystals, TOF) and CT detectors (e.g., 64/128-row detectors).
  • Examination of image reconstruction techniques (iterative methods, PSF corrections) and dose modulation systems in CT.

Main Results:

  • PET component advancements, including faster crystals and Time of Flight (TOF) techniques, have improved sensitivity and lesion detection, especially in noisy backgrounds.
  • CT component improvements, such as multi-row detectors, enable rapid acquisition of high-diagnostic-quality anatomical images for attenuation correction and diagnosis.
  • Modern PET/CT scanners incorporate radiation dose modulation systems for patient safety.

Conclusions:

  • Continuous technological advancements in both PET and CT components have significantly enhanced the performance and diagnostic value of hybrid PET/CT scanners.
  • The evolution of PET/CT technology has expanded its role from attenuation correction to providing comprehensive diagnostic information.
  • Future developments promise further improvements in image quality, sensitivity, and clinical applications of PET/CT imaging.