Abstract
The x‐ray microbeam system for studying tongue movements and other articulatory gestures has been in routine operation for the past year. The precision and accuracy with which the system can track pellets is dependent upon a number of factors. These include the x‐ray system operating parameters and characteristics, pellet size, background conditions, and image processing algorithms used for real‐time tracking. The results of studies that address these issues, and their importance with respect to interpretation and use of articulatory movement data, will be discussed. Other methodological issues of importance to potential users include head movement correction via the use of reference pellets and empirical specification of anatomical reference planes for expressing the acquired speech movement data. The x‐ray dosage incurred by subjects studied to date has also been carefully examined. Even when using peak spatial dose, a conservative estimate, subjects can participate in repeated speech production studies without exceeding the yearly Federal whole body dose limit. The status of the system and planned updates will also be presented. [Support for this facility is provided by NINCDS (NS‐16373).]
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