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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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Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
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The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
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Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
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Anorectal pitfalls in computed tomography colonography.

Lori Mankowski Gettle1, David H Kim1, Perry J Pickhardt2

  • 1Department of Radiology, University of Wisconsin School of Medicine and Public Health, 600 Highland Ave, E3/380 Clinical Science Center, Madison, WI, 53792, USA.

Abdominal Radiology (New York)
|August 22, 2019
PubMed
Summary

CT colonography (CTC) can reveal many anorectal lesions, some benign but mistaken for cancer. Recognizing anatomical and technical pitfalls improves diagnostic accuracy, reducing missed cancers and false positives.

Keywords:
AnorectalCT colonographyPitfallsVirtual colonoscopy

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Area of Science:

  • Radiology
  • Gastroenterology
  • Oncology

Background:

  • Anorectal lesions present unique diagnostic challenges on CT colonography (CTC).
  • Benign anorectal findings can be misdiagnosed as malignant on CTC.
  • Technical and anatomical pitfalls can hinder accurate CTC interpretation of the anorectal region.

Purpose of the Study:

  • To systematically review common and uncommon anorectal lesions detected by CTC.
  • To identify and discuss technique-related and anatomy-related pitfalls in CTC interpretation of the anorectal region.
  • To provide strategies for optimizing CTC interpretation and improving diagnostic accuracy.

Main Methods:

  • Systematic review of literature on anorectal findings in CTC.
  • Categorization of pitfalls into anatomical and technical factors.
  • Discussion of diagnostic strategies and interpretation tips.

Main Results:

  • Numerous pathological lesions are observed in the anorectal region via CTC.
  • Common benign findings may be misinterpreted as malignant.
  • Specific anatomical variations and technical issues can lead to diagnostic errors.

Conclusions:

  • Understanding anorectal anatomy and CTC techniques is crucial for accurate interpretation.
  • Awareness of potential pitfalls minimizes misdiagnosis of anorectal lesions.
  • Optimized CTC interpretation reduces missed cancers and false positives in the anorectal region.