Question
Download Solution PDFWhat positioning error could cause foreshortening of the image in radiography?
Answer (Detailed Solution Below)
Option 1 : Improper central ray angulation
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Detailed Solution
Download Solution PDFCorrect Answer: Improper central ray angulation
Rationale:
- Foreshortening in radiographic imaging occurs when the part of the body being imaged appears shorter than its actual size. This can happen due to the misalignment of the central ray with the anatomical structure.
- Improper central ray angulation is a primary cause of foreshortening. When the central ray is not perpendicular to the part being imaged, it causes the structure to appear compressed or shortened on the radiograph.
Explanation of Other Options:
Increased source-to-image distance
- Rationale: Increasing the source-to-image distance (SID) will generally reduce magnification and improve image sharpness. However, it does not cause foreshortening. Instead, it helps in reducing the effects of divergence of the X-ray beam.
Correct collimation
- Rationale: Proper collimation limits the size and shape of the X-ray beam to the area of interest. It reduces patient exposure and improves image quality by minimizing scatter radiation. It does not cause foreshortening.
Low mAs settings
- Rationale: mAs (milliampere-seconds) settings control the amount of radiation produced by the X-ray tube. Low mAs settings result in lower image density and may increase quantum noise. However, they do not affect the shape or size of the image and therefore do not cause foreshortening.
Conclusion:
- Among the given options, improper central ray angulation is the correct answer as it directly causes foreshortening of the radiographic image. Proper alignment and positioning are essential to avoid such distortions and ensure accurate imaging.
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