Geometric Detail, Visibility & Distortion Of Detail

GEOMETRIC DETAIL, VISIBILITY AND DISTORTION

DISTORTION 

Indicates an undesired change in the size and/or shape of the anatomic part has occurred in the process of imaging the part.

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Misrepresents the size and or/shape of the object.

VISIBILITY 

Of the recorded detail, refers to the brightness or density of the image along with image contrast.

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Visibility of the anatomic structures and accuracy of the structural lines recorded to determine the over all quality of the radiographic image.

Motion

Change in position Image of an object with unsharpness respect to time. increases

If it increases, the

Focal Spot Size

Area of the anode unsharpness surface which receives the beam of electrons from increases also and the cathode recorded detail decreases

Object Film Distance

In the taking of The close the a radiograph the distance object to the between the object and the image receptor the film sharper the image

Focal Film Distance

Distance between the focal spot and the film

If it increases, skin dose in reduced

The higher the speed of IS, the

Intensifying Screen Speed

How fast it reacts more divergent is to X-ray. the light emitted, and the poorer the detail produced If it increases,

Casettes that have visibility detail Non Screen Holder no intensifying screens decreases and

Improper contact of the film screen may cause blur and magnification.

Film Screen Contact

Relation ship between the film and the intensifying screen.

If contact is not uniform, the distance light required to travel will differ from one area to another. The result would produce distortion, magnification, blur, or artifacts.

MOTION 

Change in position of an object with respect to time.

TYPES OF MOTION

VOLUNTARY MOTION 

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Patient movement of body 

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Generalised blurring of  the linked structure, such  as blurring of the thoracic  bony and tissue structures  as evident 

INVOLUNTARY MOTION 

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Cardiac, Peristalsis, Spasm and  Tumor 

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Localised unsharpness or blurring 

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Less obvious but can be  visualised on abdominal images  as localised blurring of the bowel  outlines appearing sharp