In short F.F.D:
- a- Unacceptable geometric unshapness image.
- b- Magnification image c-Uneffected image.
- d- Small image.
Impact of F.F.D. on Image Properties:
- Magnification:
Increasing F.F.D. decreases magnification, while decreasing F.F.D. increases magnification. So, option b. Magnification image could be true depending on the context (increased or decreased F.F.D.).
- Geometric Unsharpness:
Geometric unsharpness refers to blurring caused by the X-ray source not being a point source. Increasing F.F.D. reduces geometric unsharpness, as the rays diverge less at a larger distance. This means option a. Unacceptable geometric unshapness image wouldn't necessarily be true for a larger F.F.D. (unless other factors contribute to blurring).
- Image Size:
Higher F.F.D. will result in a larger image on the film or detector. So, option d. Small image wouldn't be true for an increased F.F.D.
- Radiation Dose:
Increasing F.F.D. decreases the radiation dose to the patient as the X-rays spread out over a larger area. Therefore, F.F.D. plays a role in balancing image quality and patient safety.
Determining the Actual Image Characteristic:
Without additional information like the baseline F.F.D., the change in F.F.D., and the specific imaging context, it's impossible to definitively say whether the resulting image would be magnified, unsharp, small, or unaffected.
Understanding the interplay between F.F.D. and its effects on different image properties is crucial for optimizing image quality while minimizing radiation exposure in medical imaging.
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Technique