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Dentomaxillofacial Radiology, Vol 18, Issue 4 169-176, Copyright © 1989 by British Institute of Radiology

ARTICLES

The effect of system parameters on resolution in rotational panoramic radiography. A mathematical analysis

A. Backstrom, U. Welander, W. D. McDavid, G. Tronje and G. C. Sanderink

The unsharpness in rotational panoramic radiography is the combined effect of motion unsharpness, screen-film unsharpness and geometrical unsharpness. A computer program was written to calculate the noise equivalent passband (Ne) from the modulation transfer function (MTF) of each of the three sources of unsharpness in both the horizontal and vertical dimensions for a typical panoramic machine. Effects on system resolution resulting from changing the size of the focal spot, the screen-film combination, the width of the beam, and the effective projection radius were computed and the interaction of the various parameters was evaluated. Data of this type is essential for evaluation of system performance and for optimizing the operation of panoramic systems.




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Copyright © 1989 by the British Institute of Radiology.