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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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Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and...
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Contrast agents and mechanisms.

Walter Dastrù1, Dario Longo1, Silvio Aime1

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Recent advances in MRI contrast agents improve sensitivity and enable molecular imaging. New agents include paramagnetic probes and frequency-encoding methods like chemical exchange saturation transfer and hyperpolarized molecules.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Radiochemistry

Background:

  • Magnetic Resonance Imaging (MRI) contrast agents are crucial for clinical diagnostics.
  • Existing agents face limitations in sensitivity and molecular imaging capabilities.
  • Recent research focuses on enhancing MRI contrast agent performance.

Purpose of the Study:

  • To review recent advancements in MRI contrast agent design.
  • To highlight strategies for improving sensitivity in MRI.
  • To discuss the development of agents for molecular imaging applications.

Main Methods:

  • Paramagnetic relaxation probes for enhanced sensitivity.
  • Development of frequency-encoding agents.
  • Application of chemical exchange saturation transfer (CEST) agents.
  • Utilization of hyperpolarized (13)C-enriched molecules.

Main Results:

  • Significant improvements in MRI contrast agent sensitivity have been achieved.
  • Novel classes of frequency-encoding agents demonstrate promising results.
  • Paramagnetic probes offer enhanced relaxation properties.
  • CEST and hyperpolarized agents enable advanced molecular imaging.

Conclusions:

  • Modern MRI contrast agents offer superior sensitivity and new molecular imaging possibilities.
  • Advancements in agent design are expanding the diagnostic potential of MRI.
  • Frequency-encoding agents represent a significant leap in MRI technology.