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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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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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Imaging Studies II: Ultrasonography01:24

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IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
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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
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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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Updated: Sep 11, 2025

Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography
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Ultrafast tomograms in a flash.

Lei Tian1,2

  • 1Department of Electrical and Computer Engineering, Boston University, Boston, MA 02215, USA.

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Summary
This summary is machine-generated.

Fourier synthesis optical diffraction tomography enables rapid, label-free 3D imaging. This breakthrough allows real-time observation of dynamic biological and soft-matter processes at unprecedented speeds.

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Area of Science:

  • Biophysics
  • Optical Imaging
  • Soft Matter Physics

Background:

  • Label-free 3D imaging is crucial for observing dynamic processes.
  • Previous methods lacked the speed and resolution for complex biological dynamics.

Purpose of the Study:

  • To develop a high-speed, label-free 3D imaging technique.
  • To enable the study of dynamic biological and soft-matter systems.

Main Methods:

  • Fourier synthesis optical diffraction tomography (FODT).
  • Encoding hundreds of views per exposure.
  • Kilohertz-rate data acquisition.

Main Results:

  • Achieved kilohertz-rate 3D imaging.
  • Enabled label-free visualization of complex dynamics.
  • Demonstrated imaging capabilities for biological and soft-matter samples.

Conclusions:

  • FODT overcomes previous limitations in imaging speed and resolution.
  • This technique opens new avenues for studying dynamic systems in real-time.
  • Label-free, high-speed 3D imaging is now feasible for previously inaccessible processes.