Ch.28 and 29
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| The __________ referred to the sharpness of structural line recorded in the image. | Geometric properties.
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| Some information is always lost during the process of? | Image formation
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| ___________ is achieved by maximizing the amount of recorded detail in minimizing the amount of distortion. | Optimal geometric quality.
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| __________ refers to the distinctness or sharpness of the structural lines that make up the recorded image. | Recorded detail
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| The amount of _______ is a result of the relationship among the size of the focal spot, SID and OID. | Geometric unsharpness.
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| A __________ cannot be the exact reconstruction of the anatomic structure. | Radiographic image
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| Manipulating each variable __________________ alters the amount of unsharpness recorded in the image. | Individually or in combination
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| Focal spot size is determined by? | Filament size
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| When you select a focal spot size, you're actually selecting a ___________ that will be energized during x-ray production. | Filament size
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| Small focal sizes are usually ________mm | 0.5 to 0.6 mm
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| Large focal sizes are usually _________mm | 1.0 to 1.2 mm
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| Focal spot size only affects recorded _______ | Detail
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| As focal spot size Increases, unsharpness ________ and recorded detail _______ | Unsharpness increases and recorded detail decreases
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| As focal spot size decreases, unsharpness ________ and recorded detail ________ | Unsharpness decreases and recorded detail increases
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| In general, the smallest focal spot size available should be used in every _______ | Exposure.
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| The exposure is limited with a _________ | Small focal size.
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| When a small focal spot is used, the ________ created during x-ray exposure is concentrated in a small area and could cause tube damage. | Heat
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| You have to weigh the importance of improved recorded detail for a particular exam or anatomic part against the amount of __________ used. | Radiation exposure.
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| ______________ are equipped with safety circuits that prevent an exposure from being make if that exposure will exceed the tube loading capacity for the focal spot size selected. | Modern generators.
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| ____________ made just under the limit over a long period can still jeopardize the life of the x-ray tube. | Repeated exposures
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| Intensity of the x-ray beam is altered when changing the __________ between the source and object or object and receptor, some is the amount of unsharpness recorded on the image. | Distance.
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| Because of the _________________, A geometric relationship exist among the source of x-rays, the object, and the image receptor. | Diverging beam.
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| Increasing the SID, ______ The amount of unsharpness and ________ The amount of recorded detail in the image. | Decreases unsharpness, increases detail.
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| Decreasing the SID, _______The amount of unsharpness and ________The amount of recorded detail in the image. | Increases unsharpness, decreases detail.
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| Increasing that OID, ________ The amount of unsharpness and ________ The recorded detail. | Increases unsharpness, decreases detail
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| Decreasing the amount of OID, ______ The amount of unsharpness and _______ the detail. | Decreases unsharpness, increases detail
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| _____________ distances for SID are used in x-ray to accommodate equipment limitations. | Standard
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| Except for chest and cervical spine exams, a 40 inch or 48 inch SID is the _____ | Standard
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| In addition to the SID, the OID also affects the amount of | Unsharpness
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| Optimal detail is achieved when the OID is _____ | 0
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| But there is always some ______ created between the area of interest and the image receptor. | Distance
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| As the exit beam leaves the patient, it continues to ______ | Diverge.
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| When _______ is created between the area of interest and the image receptor, they diverging beam records ________ unsharpness within the image | Distance; increased
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| The distance between the area of interest and the image receptor has a greatest effect on the amount of ________ | Geometric unsharpness
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| When possible, the distance between the area of interest and the image receptor should be kept to a ________ | Minimum
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| The distance between the area of interest in the image receptor has a greatest effect on the amount of geometric unsharpness recorded than does | Focal spot size or SID
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| The relationship among the variables of focal spot size and distance can be demonstrated by the geometric unsharpness _______ | Formula
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| Focal spot size X OID / SOD = | Geometric unsharpness
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| Dimensions of the nominal focal spot in millimeters is | Focal spot size
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| The distance between the object ( Area of interest) And the image receptor. | OID
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| The distance between the focal spot (source) and the object (area of interest). | SOD
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| ______ = SID - OID | SOD
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| When calculating the amount of unsharpness, keep the distance in the same units (I.e., inches or centimeters) this will cancel the units and result in | The unsharpness unit in millimeters
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| Motion unsharpness has the most detrimental effect on the ___________ of the radiographic image | Recorded detail
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| Motion of the tube, Port, or image receptor cause a decrease in ______ | Detail
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| Motion needs to be ________ | Eliminated
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| Unsharpness resulting from patient motion is known as | Blur
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| Blur is the most detrimental Factor to maximizing ______ | Detail
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| Unsharpness due to motion is classified as | Voluntary - within the patients control or involuntary - outside the patients control ex. Peristalsis
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| Most motion results from the patient _____ | Moving during an exposure
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| How would you eliminate emotion? | Shorter exposure time, higher mA. Provide clear instructions for the patients. Using physical Immobilization ex. Sandbags, tape.
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| Size distortion/magnification refers to an _____________________ compared to its true or actual size. | Increase in the objects image size
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| Radiographic images of objects are always ______ in terms of the true object size. | Magnified
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| The _______ used (______ and _______) Play an important part in minimizing the amount of size distortion. | Distances (SID and OID).
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| Magnification of the true object will occur because there is always some ______ | OID
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| ______ Is directly related to magnification | OID
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| As OID increases, size distortion ( magnification) _________ | Increases
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| As OID decreases, size distortion _________ | Decreases
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| _______. Also influences the total amount of size distortion represented on an image | SID
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| ________ has the greatest effect on size distortion, _______ is still an important factor to control to minimize size distortion. | OID; SID
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| ________ is inversely related to magnification. | SID
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| As SID increases, size distortion magnification ________ | Decreases
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| Distortion results from the radiographic ________ and either the size magnification or shape of the anatomic part | Misrepresentation
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| When the image is distorted, detail is ______ | Reduced
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| The _______________ indicates how much size distortion is demonstrated. | Magnification factor (MF)
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| SID/SOD= | MF
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| SID - OID= | SOD
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