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Effects of varying filter kernel sizes on the image quality of interstitial lung diseases
R D Müller1, D Herting, H Hirche
1Central Radiology Diagnostic Institute, University Hospital, Essen; Germany.
Purpose:
The aim of the study was to optimize the postprocessing of digital luminescence radiographs of interstitial infiltrates of the lung.
Material And Methods:
Ninety-seven patients with established diseases of the lung parenchyma were examined: 514 pathological details were investigated, using a 200-speed screen-film system and a storage phosphor plate. In digital postprocessing, the size of the filter kernel (S) varied between S 5 and S 70. Based upon 32896 individual evaluations, the image quality was evaluated in multifactorial variance analyses.
Results:
The digital standards were significantly inferior to the tested screen-film system. The large filter kernel S 70 and the small filter kernels S 5 and S 10, as well as an algorithm for edge enhancement, showed selective advantages in the depiction of nodular or small linear structures. For micronodular and linear structures, kernel sizes of S 20 and S 40 produced equally good results (p > 0.05).
Conclusion:
Whenever optimized postprocessing is involved, storage phosphor radiography is equal to a modern screen-film system and can be substituted for the latter without any loss of image quality; this is especially valid for the imaging of interstitial infiltrates of the lung.