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Fine structure of the Panorex image.
Oral Surgery, Oral Medicine, and Oral Pathology
|April 1, 1977
Summary
This study quantifies the focal trough in the Panorex panoramic x-ray machine, finding a 4.3 mm thickness. Image blur increases with trough thickness, affecting medial and lateral object enlargement differently.
Area of Science:
- Dental radiology
- Medical imaging technology
Background:
- Panorex panoramic x-ray machines are widely used in dentistry.
- Accurate assessment of the focal trough is crucial for diagnostic image quality.
Purpose of the Study:
- To quantitatively describe the plane of focus and blur margins in the Panorex machine.
- To determine the focal trough thickness and magnification factors.
Main Methods:
- Utilized a continuous phantom to measure blur margins.
- Conducted readings at ninety-eight separate film positions.
- Calculated focal trough thickness and enlargement factors.
Main Results:
- The average focal trough thickness was determined to be 4.3 mm.
- A 10% blur margin correlated with increased trough thickness.
- Object enlargement was uniform at the focal plane (1.25x) but varied medially and laterally with increasing blur.
Conclusions:
- Established quantitative parameters for the Panorex focal trough.
- Demonstrated a direct relationship between focal trough thickness and image blur.
- Highlighted differential enlargement effects medial and lateral to the focal plane.