Abstract
The effect of multichannel collimators with relatively thick septa on images derived from a scintillation camera is described. This effect, manifested as a Moire pattern, shows cyclic changes in appearance as a phantom is rotated in a plane parallel to the collimator face. A single line source wider than the maximum septal thickness shows little septum effect at any imaging distance. Collimator motion through a distance greater than maximum septal width will eliminate septal effect. Although septal effect is not visible in images of complex objects, there may be defects in data derived from such objects. The theory of production of these effects is illustrated.
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