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Related Concept Videos

Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
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Anatomical Positions01:11

Anatomical Positions

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In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
The arms are hanging by the...
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Flail Chest-II01:26

Flail Chest-II

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Managing flail chest, a condition characterized by a segment of the chest wall moving independently from the rest of the thoracic cage, requires a comprehensive approach. It includes a thorough assessment of the patient's condition, a diagnostic evaluation to determine the extent of the injury, and the implementation of appropriate medical interventions tailored to the individual's needs.
Assessment:
1. Clinical Evaluation:
History:
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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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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.
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Chest Physiotherapy

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Chest Physiotherapy (CPT) is a therapeutic technique used in respiratory care to improve ventilation, clear bronchial secretions, and enhance the efficiency of respiratory muscles. This therapy includes three primary procedures: postural drainage, percussion, and vibration. It can be performed on spontaneously breathing patients and those who are intubated and mechanically ventilated.
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Related Experiment Video

Updated: Apr 28, 2026

Fabrication and Characterization of Optical Tissue Phantoms Containing Macrostructure
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[Phantom holder of CT couch].

Ruixia Zhang, Hongyu Zhan, Di Wang

    Zhongguo Yi Liao Qi Xie Za Zhi = Chinese Journal of Medical Instrumentation
    |June 20, 2014
    PubMed
    Summary

    This study introduces an easily installed CT phantom holder for accurate phantom testing. The innovative design allows for precise adjustments, significantly reducing operator work time.

    Area of Science:

    • Medical Imaging Technology
    • Radiological Physics

    Context:

    • Accurate phantom testing is crucial for quality assurance in Computed Tomography (CT) imaging.
    • Existing methods for positioning phantoms on CT couches can be cumbersome and time-consuming.

    Purpose:

    • To describe the design and functionality of a novel phantom holder for CT couches.
    • To highlight the ease of installation, adjustment, and operation of the developed phantom holder.

    Summary:

    • The described phantom holder features a secure locking mechanism for attachment to the CT table top.
    • It enables precise horizontal, longitudinal, and rotational adjustments of the phantom.
    • The holder allows for free adjustments post-initial fixation, enhancing usability.

    Impact:

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    • Facilitates more accurate and efficient phantom testing in CT imaging procedures.
    • Reduces the time required for CT quality assurance protocols.
    • Improves the overall workflow for radiological technologists and physicists.