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Related Concept Videos

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 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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Related Experiment Video

Updated: Jun 10, 2026

Technical Approach for Infrared Tracking for Soft Tissue Navigation with a Holographic Head-Mounted Display and Preclinical Validation
10:25

Technical Approach for Infrared Tracking for Soft Tissue Navigation with a Holographic Head-Mounted Display and Preclinical Validation

Published on: September 2, 2025

Real-time tomographic holography for augmented reality.

John M Galeotti1, Mel Siegel, George Stetten

  • 1The Robotics Institute, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, USA. galeotti+osa@cs.cmu.edu

Optics Letters
|July 17, 2010
PubMed
Summary
This summary is machine-generated.

Real-time tomographic holography (RTTH) creates virtual medical images overlaid onto the patient for guided procedures. This technology enhances hand-eye coordination without needing extra equipment like head-mounted devices.

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Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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Last Updated: Jun 10, 2026

Technical Approach for Infrared Tracking for Soft Tissue Navigation with a Holographic Head-Mounted Display and Preclinical Validation
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Published on: September 2, 2025

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Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution

Published on: August 16, 2012

Area of Science:

  • Medical imaging
  • Optical engineering
  • Augmented reality

Background:

  • Invasive medical procedures require precise guidance.
  • Current tracking systems and head-mounted devices can be cumbersome.
  • Visualizing internal structures in real-time is challenging.

Purpose of the Study:

  • To present the concept and instantiation of real-time tomographic holography (RTTH).
  • To enable natural hand-eye coordination for guiding medical procedures.
  • To eliminate the need for tracking or head-mounted devices in augmented reality medical applications.

Main Methods:

  • Developed a real-time tomographic holography system.
  • Utilized a flat narrowband holographic optical element (HOE) with optical power.
  • Integrated a small spatial light modulator display.
  • Mounted the device on a medical ultrasound probe.

Main Results:

  • Achieved natural hand-eye coordination for guiding procedures.
  • Displayed a real-time virtual image of an object's cross-section in its actual location.
  • Demonstrated minimal viewpoint dependence (no parallax error).
  • Enabled viewing the virtual image without obscuring the physical world.

Conclusions:

  • RTTH provides an effective method for real-time augmented reality in medicine.
  • The system allows for intuitive guidance of invasive procedures.
  • RTTH integrated with ultrasound probes can visualize internal scans in situ.