Questions and Answers
In 1895 Wilhelm Roentgen used ______ from a cathode ray tube to expose a photographic plate.
X-rays
X-rays are photons and are generated from a complex ______ tube.
X-ray
The basic physics of ______ generation has not changed.
X-ray
As the X-rays pass through the body, they are ______ by the tissues.
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Bone appears ______ on the film because this region of the film has been exposed to the least amount of X-rays.
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Air appears ______ on the film because these regions were exposed to the greatest number of X-rays.
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Modifications to this X-ray technique allow a continuous stream of X-rays to be produced from the ______ tube.
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In the body, ______ attenuates X-rays the most.
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In the body, fat attenuates X-rays more than ______ but less than water.
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The differences in ______ result in differences in the level of exposure of the film.
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Study Notes
Diagnostic Imaging Techniques
- Wilhelm Roentgen used X-rays from a cathode ray tube to produce the first radiographic exposure of his wife's hand in 1895.
- The past 30 years have seen a revolution in body imaging, paralleled by developments in computer technology.
Plain Radiography
- X-rays are photons, a type of electromagnetic radiation, generated from a complex X-ray tube, a type of cathode ray tube.
- The X-ray generation process involves:
- X-rays being generated from the X-ray tube
- X-rays being collimated (directed through lead-lined shutters) to the appropriate area
- X-rays passing through the body and being attenuated (reduced in energy) by tissues
- X-rays interacting with photographic film
- The level of X-ray attenuation varies depending on the tissue type:
- Air attenuates X-rays a little
- Fat attenuates X-rays more than air but less than water
- Bone attenuates X-rays the most
- The differences in attenuation result in differences in the level of exposure of the film, causing:
- Bone to appear white on the film (least exposed to X-rays)
- Air to appear dark on the film (most exposed to X-rays)
- Modifications to the X-ray technique allow for:
- Continuous stream of X-rays to be produced and collected on an input screen
- Real-time visualization of moving anatomical structures, barium studies, angiography, and fluoroscopy
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Description
Explore the evolution of body imaging techniques, from Wilhelm Roentgen's pioneering work to modern developments in computer technology. Learn about plain radiography, X-ray generation, and more!
