Distortion
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| What is distortion? | The second of two geometric properties affecting radiograph image quality
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| What is the only possible size distortion in radiography? | Magnification
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| What are the two classifications of distortion? | Size or shape distortions
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| True or false can distortion exist even if it can't be seen due to poor visibility? | True
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| Factors that Control distortion with size or what | OID and SID
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| Factors that control distortion with shape or what? | Alignment and angulation
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| What are the reasons distortion would be a factor with alignment? | Central ray
part and
image receptor
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| What are the reasons distortion would be a factor with angulation | Direction and degree
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| The greater the SID ______ the magnification | greater
smaller
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| Distortion is directly related to what? | positioning
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| True or false X-ray photons can be reflected for refracted by ordinary methods? | False, they can only diverge from their point of source
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| SID | Source to image receptor distance
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| OID | Object to image receptor distance
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| Does reduced Magnification size distortion increase or decrease the resolution of recorded detail? | increases
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| What is the magnification factor formula | M= SID
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SOD
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| what is Fidelity? | – true representation (the sharpness) of the image of the radiographed object
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| Property of geometric factors: | OID
SID
FSS (focal spot size)
Distortion
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| Geometric factors: | Magnification
Distortion
Focal spot blur
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| A longer SID __________________magnification A shorter SID_________________ magnification | decrease
increases
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| OID has significant impact at both | magnification and resolution (detail)
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| what is MF ? | Magnification factor
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| what is the formula for MF? | MF=. Image size
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object size
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| will the image size be bigger or smaller than the object? | bigger
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| What is the formula for calculating object size? | OS = image size
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MF
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| what are the two factors that affect image magnification? | SID and SOD
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| To minimize magnification Large (long) ________: use as large SID as possible | SID
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| Small (short) OID: place an object as ___________as possible to the IR | close
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| Define Elongation | Projects the object so it appears longer than its actual size.
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| Define Foreshortening | Projects the object so that it appears shorter than its actual size.
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| when does elongation occur ? | This will occur when the CR and image receptor is improperly aligned.
Occurs when IR is improperly aligned
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| When does foreshortening occur? | This occurs only when the part is improperly aligned (not parallel to the IR).
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| What happens If object plane and IR plane is not parallel | distortion occurs
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| True or false Thicker objects are less distorted than thinner object | False, they are more distorted
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