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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.
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...
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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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Design Example: Traverse Angle Computations01:25

Design Example: Traverse Angle Computations

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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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Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

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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 Tomography01:29

Positron Emission Tomography

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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.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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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.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
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Updated: Jan 25, 2026

Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
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Computed Tomography in Pregnant Patients.

Matthias H Schmidt1

  • 1Department of Radiology, Dalhousie University, Nova Scotia, Canada.

Journal of Medical Imaging and Radiation Sciences
|May 5, 2019
PubMed
Summary

Computed tomography (CT) scans in pregnant women may double childhood cancer risk. This overview discusses radiation risks, patient/provider knowledge, current CT use, and risk management strategies for pregnant patients.

Area of Science:

  • Medical Imaging
  • Radiology
  • Obstetrics

Background:

  • Computed tomography (CT) use in pregnant patients is increasing.
  • While a single abdominal CT may not raise risks of miscarriage or birth defects, it's linked to a doubled risk of childhood cancer.
  • Understanding radiation risks to fetuses is crucial.

Purpose of the Study:

  • To provide an overview of radiation risks associated with CT scans in pregnant women.
  • To explore current knowledge and beliefs about these risks among patients and healthcare professionals.
  • To examine the current application of CT in pregnant patient care and outline risk management strategies.

Main Methods:

  • Literature review and synthesis of existing data on CT radiation exposure during pregnancy.

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  • Analysis of patient and healthcare provider perceptions regarding CT risks.
  • Discussion of current clinical practices and risk mitigation techniques.

    • Main Results:

    • A single abdominal CT scan does not appear to increase the risk of spontaneous abortion or congenital malformations.
    • CT exposure is associated with a potential doubling of childhood cancer risk.
    • There is a need to address knowledge gaps and concerns among patients and providers regarding CT radiation exposure.

    Conclusions:

    • Managing radiation risks from CT scans in pregnant women requires a comprehensive approach.
    • Stimulating discussion among healthcare providers is essential for informed decision-making and patient care.
    • Addressing patient and provider concerns is key to responsible CT utilization during pregnancy.