CH-9 X-Ray Emission
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| show | The thickness of absorber or homogenous filter that will reduce an X-ray beam to half its original value or intensity
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| show | Energy of motion
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| Quality (X-ray) | show 🗑
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| show | As the energy of an X-ray beam is increased, the penetrability or quality of the X-ray beam is also increased
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| Kilovoltage | show 🗑
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| show | Long scale contrast (less difference between areas receiving varying amounts of radiation)
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| Low kVp = high subject contrast | show 🗑
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| show |
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| Filtration | show 🗑
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| show | To selectively remove low-energy X-rays that have no chance of getting to the film Causes the X-ray beam to have nearly the same energy or be mono-energetic
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| show |
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| Advantages of a FilterResults in X-ray beam with | show 🗑
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| Inherent Filtration | show 🗑
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| Added Filtration | show 🗑
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| show | • filters are used to compensate for differences in subject radiopacity used to even out widely differing tissue densities
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| show | used to radiograph body parts that varies considerably, such as
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| show | bilateral wedge filter) used mainly for chest radiography
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| Bow-tie-shaped filters | show 🗑
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| • Cone filters | show 🗑
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| show | Used in some special procedures, where long sections of the anatomy are radiographed with two or three separate films. Used in rapid film changers for translumbar and femoral arteriography and venography.
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| show | Flat sheet of metal, usually lead with a hole cut in the center and attached to the x-ray tube port.
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| Change in mA | show 🗑
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| Increased kVp | show 🗑
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| show | increased X-ray beam quality or penetrating capability, hence less patient absorption
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| show | Increasing target atomic number enhances the efficiency of x-ray production and the energy of characteristic and bremsstrahlung x-rays
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| show | refers to the range of OD's from the whitest to the blackest part of the radiograph
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| show | short scale low kVp
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| low contrast | show 🗑
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| kVp | show 🗑
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| 15% rule | show 🗑
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| show | • a smaller technique compensation for a change in contrast scale • an increase of 5% in kVp may be accompanied by a 30% reduction in mAs to produce the same OD
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| mAs | show 🗑
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| Intensifying screens | show 🗑
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| Collimation | show 🗑
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| show | also reduces scatter
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| Radiographic Detail | show 🗑
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| Penumbra | show 🗑
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| As the FS size decreases | show 🗑
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| Source Image Distance (SID) | show 🗑
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| Object Image Distance (OID) | show 🗑
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| show | reduces scatter that degrades radiographic image
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| show | reduces scatter
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| Types of motion | show 🗑
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| Methods of reducing motion | show 🗑
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| show | • the greater the SID, the smaller the magnification • 40" (100cm) is the current routine SID
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| show | • critical distance in both magnification and resolution • OID must be minimized to decrease magnification
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| Calculating size distortion | show 🗑
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| show | The misrepresentation by unequal magnification of the actual shape of the structure being examined
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| show | the anatomical part appears bigger than normal. Due to poor alignment of the IR or the x-ray tube
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| foreshortening | show 🗑
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| show | Filtration
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| show | Half-value layer
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| show | More penetrating x-ray beam
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| show | kVp
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| show | Filters
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| show | mAs
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| show | Removal of low-energy X-rays from the useful beam with aluminum or other metal
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