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Scatter-reduction characteristics of an infinity-focused gridded radiographic cassette
C E Floyd1, H G Chotas, C E Ravin
1Department of Radiology, Duke University, Durham, North Carolina 27710.
Rationale And Objectives:
The scatter-reduction properties of a new infinity-focused grid incorporated into a radiographic imaging cassette were analyzed.
Methods:
A polystyrene chest phantom was imaged using the cassette and bedside radiographic procedure. Scatter fractions were measured using a beam-stop technique at several anatomically equivalent locations. The performance of this cassette also was evaluated as a function of the orientation angle.
Results:
The gridded cassette provided a decrease in scatter fraction from 61% to 49% in the lung and from 87% to 76% in the mediastinum. To obtain equivalent film density when the grid was used, the exposure was increased by a factor of 3.0. While there was a decrease in scatter clean-up as the film cassette was tilted from the perpendicular, the grid performed well out to an angle of 10 degrees.
Conclusion:
The gridded cassette for portable radiography provides scatter reduction with little sensitivity to alignment. The availability of this device could improve scatter rejection, and therefore, contrast in portable radiographic imaging.