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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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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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Self-help support groups are voluntary, community-based organizations that provide a platform for individuals with shared concerns to exchange support, insights, and practical strategies for coping with life challenges. Typically led by group members or paraprofessionals, these groups form a cornerstone of mental health care, especially in reaching populations that are underserved by traditional healthcare systems.
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A coplanar force system refers to a set of forces that all lie in the same plane and are subject to different reactions between the point of contact and the supports. Understanding how different types of supports affect coplanar forces is crucial for designing safe and reliable structures that can withstand external loads.
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Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
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When a force is applied to a linear spring, the restoring force increases proportionally with the amount of displacement. This behavior is described by Hooke’s law, which allows the work done on the spring to be determined directly from the force–displacement relationship. In this case, the force varies in a simple and predictable manner, making the calculation relatively simple.On the other hand, a nonlinear spring does not obey Hooke’s law. Its restoring force depends on...
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Related Experiment Video

Updated: Feb 8, 2026

Cone Beam Intraoperative Computed Tomography-based Image Guidance for Minimally Invasive Transforaminal Interbody Fusion
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Navigation-Supported Stereotaxy by Applying Intraoperative Computed Tomography.

Barbara Carl1, Miriam Bopp1, Marko Gjorgjevski1

  • 1Department of Neurosurgery, University Marburg, Marburg and Marburg Center for Mind, Brain and Behavior (MCMBB), Marburg, Germany.

World Neurosurgery
|July 11, 2018
PubMed
Summary

Frameless navigation techniques integrated with frame-based stereotactic procedures enhance safety and visualization. This combination, using intraoperative CT scans, reduces radiation exposure while maintaining high accuracy for neurosurgical interventions.

Keywords:
Effective radiation doseFrame-based stereotaxyFrameless stereotaxyIntraoperative computed tomographyNavigation registrationRegistration accuracy

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Area of Science:

  • Neurosurgery
  • Medical Imaging
  • Robotics

Background:

  • Frame-based stereotactic surgery is a standard neurosurgical technique.
  • Integrating frameless navigation offers potential benefits in accuracy and safety.
  • Intraoperative imaging modalities are crucial for real-time procedural guidance.

Purpose of the Study:

  • To evaluate the implementation of frameless navigational techniques within standard frame-based stereotactic procedures.
  • To assess the accuracy and safety benefits of this combined approach.
  • To explore the impact of intraoperative imaging on navigation registration and radiation dose.

Main Methods:

  • A hybrid approach combining frameless navigation with frame-based stereotaxy was applied in 25 patients undergoing various neurosurgical procedures.
  • Automatic registration was performed using an intraoperative computed tomography (CT) scan with a navigation reference array attached to the stereotactic frame.
  • Low-dose intraoperative CT protocols were utilized to minimize radiation exposure.

Main Results:

  • User-independent automatic registration achieved a low navigation registration error (0.76 ± 0.30 mm).
  • The use of low-dose intraoperative CT reduced the effective radiation dose by a factor of 7.7 (to 0.39 mSv) without compromising navigational accuracy (0.65 ± 0.05 mm).
  • Navigation-facilitated surgery enhanced procedural safety through easy checking of entry points and trajectory alignments, and improved understanding via visualization of instrument depth relative to target and risk structures.

Conclusions:

  • The combination of frameless and frame-based techniques, particularly with intraoperative imaging, presents new possibilities for stereotactic procedures.
  • High registration accuracy and enhanced intuitive intraoperative visualization contribute to improved safety and redundancy.
  • Further technical advancements are needed, such as microelectrode tracking during advancement with a microdrive.