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Related Concept Videos

Computed Tomography01:10

Computed Tomography

8.0K
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...
8.0K
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...
281

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Micro-Computed Tomography Analysis of the Knee in Aged Dunkin-Hartley Guinea Pigs after Intra Articular Injection
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Ocular Biometry in Guinea Pigs Using Computed Tomography.

Kristopher Houston1, Nicholas Goody1, Jenna Richardson1

  • 1Hospital for Small Animals, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Roslin, UK.

Veterinary Ophthalmology
|January 14, 2026
PubMed
Summary
This summary is machine-generated.

This study establishes reliable computed tomography (CT) reference ranges for guinea pig ocular biometry. These measurements help identify eye conditions in guinea pigs over 18 months old.

Keywords:
Guinea pigattenuationcomputed tomographylensreference rangevitreous

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Area of Science:

  • Veterinary Ophthalmology
  • Comparative Anatomy
  • Medical Imaging

Background:

  • Ocular biometry is crucial for diagnosing eye diseases in domestic animals.
  • Establishing species-specific reference ranges is essential for accurate interpretation of diagnostic imaging.
  • Computed tomography (CT) offers a non-invasive method for detailed anatomical assessment.

Purpose of the Study:

  • To develop a consistent and reproducible method for measuring ocular structures in guinea pigs using CT.
  • To establish normative ocular biometry reference ranges for healthy adult domestic guinea pigs (Cavia porcellus).
  • To assess the correlation between ocular measurements and animal age, sex, and weight.

Main Methods:

  • A retrospective analysis of head CT scans from 30 healthy adult guinea pigs (60 eyes).
  • Utilized 64-slice multidetector CT and 3D multiplanar reconstruction for measurements.
  • Measured globe dimensions, lens parameters, anterior and vitreous chamber lengths, and tissue attenuation values.

Main Results:

  • Established reference values for ocular dimensions: globe width (11.25±1.61 mm), height (10.56±1.43 mm), and length (10.49±1.44 mm).
  • Significant positive correlation found between body weight and anterior chamber length (p=0.045).
  • Older age was significantly associated with increased lens width (p=0.044). Excellent intra-observer and good-to-excellent inter-observer reliability were achieved.

Conclusions:

  • Computed tomography (CT) is a reliable tool for precise ocular biometry in guinea pigs.
  • The established reference ranges provide a valuable baseline for detecting ocular abnormalities in guinea pigs over 18 months of age.
  • This method supports early diagnosis and management of ophthalmic conditions in this species.