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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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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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In statistics, several tools are used to interpret the data. Measures of central tendency represent the characteristics of the data, such as mean, median, and mode. Additionally, measures of variance like standard deviation and range are used to find the spread of data from the mean. Relative standing measures the distance between data locations. Commonly used measures of relative standings are percentile, z score, and quartiles.
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Data are individual items of information obtained from a population or sample. Data may be classified as qualitative (categorical), quantitative continuous, or quantitative discrete. Because it is not practical to measure the entire population in a study, researchers use samples to represent the population. A random sample is a representative group from the population chosen by using a method that gives each individual in the population an equal chance of being included in the sample. Random...
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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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    Area of Science:

    • Medical Imaging Physics
    • Radiologic Technology

    Background:

    • Computed tomography (CT) is an advanced diagnostic imaging modality requiring specialized knowledge.
    • Radiologic technologists play a key role in optimizing CT scans for diagnostic accuracy and patient safety.

    Purpose of the Study:

    • To review the essential physical principles underlying computed tomography.
    • To discuss technical aspects of CT, including radiation attenuation and CT numbers.
    • To cover general technical concepts and multislice CT technology.

    Main Methods:

    • Review of fundamental physics principles relevant to CT imaging.
    • Explanation of radiation attenuation and its role in CT image formation.
    • Discussion of CT numbers (Hounsfield units) and their interpretation.
    • Overview of general technical parameters and multislice CT scanner technology.

    Main Results:

    • Provides a foundational understanding of CT physics.
    • Explains the relationship between radiation attenuation and image contrast.
    • Details the significance of CT numbers for tissue characterization.
    • Introduces the technical evolution towards multislice CT.

    Conclusions:

    • A thorough grasp of CT physics and technology is essential for radiologic technologists.
    • Optimizing dose and image quality in CT relies on understanding these fundamental principles.
    • Effective patient care in CT examinations is enhanced by technical expertise.