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Related Concept Videos

Imaging Studies I: CT and MRI01:14

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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:
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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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High-Resolution Three-Dimensional Hybrid MRI + Low Dose CT Vocal Tract Modeling: A Cadaveric Pilot Study.

David Meyer1, Rushdi Zahid Rusho2, Wahidul Alam2

  • 1Janette Ogg Voice Research Center, Shenandoah University, Winchester, Virginia.

Journal of Voice : Official Journal of the Voice Foundation
|August 14, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a hybrid CT-MRI model for high-resolution vocal tract imaging, accurately capturing bony structures and soft tissues for voice research. This method enhances anatomical detail for improved understanding of voice production.

Keywords:
AirwayComputed Tomography(CT)Magnetic Resonance Imaging(MRI)ModelingSegmentationVocal tract

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Area of Science:

  • Medical Imaging
  • Anatomy
  • Voice Science

Background:

  • Magnetic Resonance Imaging (MRI) vocal tract models lack detail in bony structures and have low spatial resolution.
  • Computed Tomography (CT) offers better bony detail but involves ionizing radiation risks.
  • Current MRI techniques achieve 2 mm³ resolution within 20 seconds, limiting anatomical accuracy.

Purpose of the Study:

  • To develop a high-resolution hybrid CT-MRI vocal tract model.
  • To combine low-dose CT for bone imaging with accelerated high-resolution MRI for soft tissues.
  • To improve the accuracy and detail of vocal tract models for voice research and education.

Main Methods:

  • Determined minimum CT dosages and evaluated a custom 16-channel airway receiver coil for accelerated MRI.
  • Applied a rigid body landmark-based partial volume registration scheme to blend CT and MRI data.
  • Segmented the hybrid CT-MRI model using Slicer software.

Main Results:

  • Ultra-low dose CT (0.06 mSv) provided sufficient bone visualization, comparable to transatlantic flight radiation exposure.
  • Accelerated MRI achieved 1 mm³ resolution with acceptable image quality from undersampled data.
  • Hybrid CT-MRI models demonstrated more detailed 3D vocal tract representations than MRI alone.

Conclusions:

  • High-resolution CT and MR image sets can be combined for accurate vocal tract reconstructions, including teeth and bone.
  • This hybrid approach enhances anatomical detail for voice production research and education.
  • The method advances understanding of vocal tract anatomy and its relation to voice production.