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What is an enema?
What are repeated X-rays used to measure?
What happens to an X-ray image if a patient moves during the procedure?
When is it easier to see abnormalities in the lungs?
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What is the term for a technician who administers X-rays?
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What is the term for something that is not penetrable by radiation?
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What is the term for using radiation to diagnose and treat disease?
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What is the term for something that is penetrable by radiation?
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What is the term for the process of breathing?
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Study Notes
Radiography and Radiology
- Radiography involves exposing a part of the body to a small dose of radiation to produce an image of internal organs.
- Organs with high density, such as ribs and spine, are radiopaque, meaning they don't absorb radiation, and appear white or light grey on the image.
- Lung tissue is radiolucent, absorbs radiation, and appears dark on the image.
- Contrast medium, such as barium or iodine, is used to examine organs or tissue it fills.
- Radiology is the use of radiation in the diagnosis and treatment of diseases, such as cancer.
X-ray Examination
- Chest X-ray is the commonest diagnostic X-ray examination.
- A frontal (anteroposterior) view is obtained with the patient standing facing the photographic plate.
- The patient is asked to breathe in deeply and not to breathe out to prevent a blurred image.
- A side, or lateral view, is obtained with the patient standing sideways to the photographic plate with arms raised.
- Chest X-rays may be repeated at intervals to track changes, known as serial chest X-rays.
Computed Tomography (CT)
- CT uses an X-ray source that rotates around the body to produce cross-sectional images.
- The new scanner takes up to 16 simultaneous cross-sectional images (slices) and transmits more data in less time.
- Each slice can be less than one millimeter thick, making it possible to find very small abnormalities.
- CT scanner is used for diagnosing muscle and bone disorders, locating tumors, infections, and clots, monitoring the progress of malignant diseases, and providing accurate guidance for interventional procedures.
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Description
Learn about radiography and radiology, including the principles of X-ray imaging, radiopaque and radiolucent materials, and contrast agents.
