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Related Concept Videos

Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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Vision01:24

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Brain Imaging01:14

Brain Imaging

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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
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Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

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DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
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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.
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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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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Related Experiment Video

Updated: Apr 6, 2026

Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping
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Imaging of the Functional and Dysfunctional Visual System.

Edgar A DeYoe1, John L Ulmer1, Wade M Mueller2

  • 1Department of Radiology, Medical College of Wisconsin, Milwaukee, WI.

Seminars in Ultrasound, CT, and MR
|August 3, 2015
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Summary

Functional magnetic resonance imaging (fMRI) maps the visual cortex to prevent vision loss from brain surgery. Novel displays link brain activity to vision, aiding surgical planning and patient outcomes.

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Area of Science:

  • Neuroimaging
  • Clinical Neuroscience
  • Visual Neuroscience

Background:

  • Functional magnetic resonance imaging (fMRI) is crucial for mapping the visual cortex pre-surgery.
  • Accurate mapping balances therapeutic outcomes with avoiding postoperative vision deficits.
  • Identifying visual subregions is essential for preserving critical functions like reading.

Purpose of the Study:

  • To present a novel data display for fMRI in clinical visual cortex mapping.
  • To demonstrate the functional relationship between brain activation and visual field deficits.
  • To highlight the importance of neurovascular coupling in interpreting fMRI results.

Main Methods:

  • Utilized clinically optimized fMRI stimuli, analyses, and displays.
  • Developed a novel data visualization to correlate fMRI activation with visual field data.
  • Focused on identifying cortical subregions supporting high-acuity central vision.

Main Results:

  • The novel display allows instant appreciation of the fMRI activation pattern relative to the patient's visual field.
  • Cortical subregions supporting high-acuity vision were successfully identified.
  • The study underscored the challenges posed by neurovascular uncoupling in patient fMRI interpretation.

Conclusions:

  • The developed fMRI display enhances the clinical interpretation of visual cortex function.
  • Accurate pre-surgical mapping aids in preserving essential visual functions.
  • Addressing neurovascular uncoupling is critical for reliable fMRI in patients with brain pathology.