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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...
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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.
Fundamental Principles of PET
Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

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.
Pulmonary Angiogram
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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Related Experiment Video

Updated: Jul 3, 2026

Continuous Blood Sampling in Small Animal Positron Emission Tomography/Computed Tomography Enables the Measurement of the Arterial Input Function
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A positron-probe system for arterial input function quantification for positron emission tomography in humans.

Kihak Lee1, Peter T Fox, Jack L Lancaster

  • 1Research Imaging Center, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA.

The Review of Scientific Instruments
|July 8, 2008
PubMed
Summary

A new intra-arterial positron-probe system accurately measures arterial concentrations for positron emission tomography (PET) studies. This advanced beta(+) probe system offers high sensitivity and linearity, exceeding previous benchmarks for quantitative imaging.

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Area of Science:

  • Nuclear Medicine
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Accurate arterial time-activity concentration (TAC) measurement is crucial for quantitative positron emission tomography (PET) studies.
  • Existing methods for arterial input function (AIF) quantification can be invasive or lack precision.
  • Compartmental modeling in PET requires reliable TAC data for accurate kinetic parameter estimation.

Purpose of the Study:

  • To develop and characterize an intra-arterial positron-probe (beta(+) probe) system for direct measurement of human arterial TAC.
  • To evaluate the system's performance in vitro, focusing on dead time, linearity, and absolute detector sensitivity.
  • To establish the system's suitability for quantitative compartmental modeling in PET imaging.

Main Methods:

  • Development of a novel intra-arterial positron-probe system.
  • In vitro performance characterization using a uniform phantom.
  • Measurement of system dead time, count rate linearity, and absolute detector sensitivity.

Main Results:

  • The developed beta(+) probe system demonstrated a low system dead time of 2.5 microseconds.
  • Excellent linearity was observed between measured and true count rates, with R(2) = 0.999.
  • Absolute detector sensitivity ranged from 6.9 to 7.0 counts/s per kilobecquerel per milliliter (counts/s kBq(-1) ml).

Conclusions:

  • The intra-arterial positron-probe system provides accurate and reliable arterial time-activity concentration measurements.
  • The system's performance characteristics meet or surpass those of previously reported measurement systems.
  • This technology is well-suited for quantitative compartmental modeling in human PET studies, enhancing diagnostic accuracy.