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Positron Emission Tomography01:29

Positron Emission Tomography

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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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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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Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

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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.
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Imaging Studies III: Computed Tomography01:27

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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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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[Tau Positron Emission Tomography].

Makoto Higuchi1

  • 1National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|July 26, 2017
PubMed
Summary
This summary is machine-generated.

Positron emission tomography (PET) tau probes visualize tau protein aggregates in Alzheimer's disease (AD) and frontotemporal lobar degeneration (FTLD), aiding diagnosis and tracking disease progression. New probes improve detection of non-AD tau lesions.

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Area of Science:

  • Neuroscience
  • Radiochemistry
  • Molecular Imaging

Background:

  • Fibrillar tau protein aggregates are key markers in Alzheimer's disease (AD) and frontotemporal lobar degeneration (FTLD).
  • In vivo visualization of tau lesions via positron emission tomography (PET) enables early diagnosis and monitoring of neurodegenerative diseases.
  • Developing specific tau PET probes is crucial for understanding disease mechanisms and therapeutic development.

Purpose of the Study:

  • To review the development and clinical application of tau PET probes for neurodegenerative diseases.
  • To highlight insights gained from PET imaging of tau pathology in Alzheimer's disease (AD).
  • To discuss advancements in PET probe technology for improved detection of diverse tauopathies.

Main Methods:

  • Development of low-molecular-weight chemical probes targeting beta-pleated sheet structures in tau aggregates.
  • Clinical application of first- and second-generation tau PET probes in patients with Alzheimer's disease (AD) and frontotemporal lobar degeneration (FTLD).
  • Evaluation of probe specificity, contrast, and performance in detecting various tau pathologies.

Main Results:

  • PET studies revealed age-dependent tau accumulation in the hippocampus, independent of amyloid-beta (Aβ) pathology.
  • Aβ deposition may drive tau pathology expansion in the progression from normal aging to AD.
  • Tau accumulation correlates with neuronal loss, cortical atrophy, and clinical symptoms.
  • Second-generation tau PET probes demonstrate high contrast and specificity for tau deposits, outperforming earlier versions in FTLD.

Conclusions:

  • Tau PET imaging provides valuable insights into the in vivo pathophysiology of tauopathies like AD.
  • Advancements in PET probe technology are essential for accurate diagnosis and the development of targeted therapies.
  • Collaborative efforts between academia and industry are accelerating the development and application of tau PET imaging biomarkers.