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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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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Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...

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TRIO a technique for reconstruction using intensity order: application to undersampled MRI.

Leonardo Ramirez1, Claudia Prieto, Carlos Sing-Long

  • 1Departamento de Ingeniería Eléctrica and the Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Santiago, Chile. lramirez@ing.puc.cl

IEEE Transactions on Medical Imaging
|March 26, 2011
PubMed
Summary

Magnetic resonance imaging (MRI) reconstruction is accelerated using a novel technique called TRIO (Technique for Reconstruction using Intensity Order). This method utilizes pixel intensity order, not pixel values, to reduce blurring and improve image quality in dynamic MRI scans.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Image Reconstruction

Background:

  • Long acquisition times limit magnetic resonance imaging (MRI) applications, especially in 3-D and dynamic imaging.
  • Current undersampling reconstruction techniques often introduce spatial or temporal blurring by relying on pixel intensity estimations.
  • A need exists for MRI reconstruction methods that minimize blurring and preserve image fidelity.

Purpose of the Study:

  • To introduce and evaluate a novel MRI reconstruction technique, TRIO (Technique for Reconstruction using Intensity Order).
  • To leverage image intensity order as prior information for enhanced MRI reconstruction.
  • To reduce blurring and improve the accuracy of dynamic and 3-D MRI.

Main Methods:

  • Developed TRIO, a method that uses intensity order (pixel sorting from darkest to brightest) as prior information.
  • Estimated intensity order from low-resolution images, adjacent slices, temporal correlations, or prior reconstructions.
  • Reconstructed images by finding a solution that satisfies the intensity order and minimizes data discrepancy.
  • Applied TRIO to 2-D-cine cardiac MRI with an undersampling factor of 4.
  • Utilized TRIO as a secondary reconstruction stage following keyhole, sliding window, and k-t BLAST methods.

Main Results:

  • TRIO effectively reconstructed 2-D-cine cardiac MR images with an undersampling factor of 4.
  • The technique accurately estimated the temporal evolution of cardiac structures.
  • TRIO improved image quality when used as a second-stage reconstruction after other undersampling methods.
  • Intensity order-based reconstruction mitigated blurring issues inherent in pixel intensity-based methods.

Conclusions:

  • TRIO offers a promising approach to accelerate MRI acquisition by reducing undersampling artifacts.
  • The use of intensity order as prior information is a viable strategy for improving MRI reconstruction.
  • TRIO enhances the accuracy and quality of dynamic cardiac MRI and can be integrated with existing reconstruction techniques.