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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...
Computed Tomography01:10

Computed Tomography

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.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Electron Microscope Tomography and Single-particle Reconstruction01:07

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 Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
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...
Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

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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Related Experiment Video

Updated: Jun 23, 2026

Hybrid &#181;CT-FMT imaging and image analysis
13:45

Hybrid µCT-FMT imaging and image analysis

Published on: June 4, 2015

Modal-based tomographic imaging from far-zone observations: multifrequency case.

Ersel Karbeyaz1, Carey M Rappaport

  • 1Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA. ekarbeya@ece.neu.edu

Optics Letters
|May 5, 2009
PubMed
Summary
This summary is machine-generated.

This study enhances optical diffraction tomography for dispersionless objects by fusing multifrequency data. This improved method offers superior imaging compared to single-frequency approaches.

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Area of Science:

  • Optics and Photonics
  • Electromagnetism
  • Imaging Science

Background:

  • Optical diffraction tomography (ODT) is a powerful imaging technique.
  • Standard ODT methods can be limited by frequency-dependent material properties (dispersion).
  • Dispersionless scatterers, where material properties are frequency-independent, present a unique challenge and opportunity.

Purpose of the Study:

  • To modify optical diffraction tomography for analyzing dispersionless objects.
  • To enable the fusion of multifrequency data for enhanced imaging.
  • To demonstrate the advantages of multifrequency data fusion over single-frequency analysis.

Main Methods:

  • Modification of a recently developed optical diffraction tomography technique.
  • Development of a method to handle dispersionless scatterers by fusing multifrequency data.
  • Simulation of a dispersionless and lossless object probed with plane waves at various frequencies and incidence angles.

Main Results:

  • Successful adaptation of ODT for dispersionless scatterers.
  • Demonstration of effective fusion of multifrequency data.
  • Quantified superiority of multifrequency data fusion over single-frequency data for imaging.

Conclusions:

  • The modified ODT technique effectively images dispersionless objects.
  • Fusing multifrequency data significantly improves imaging quality compared to single-frequency methods.
  • This advancement offers enhanced capabilities for characterizing specific types of materials and objects.