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- W2469656581 abstract "SUMMARY. We have undertaken the design and testing of a system for making measurements of velopharyngeal function from lateral videofluoroscopic images based upon standard equipment found in any cleft clinic. The uncertainties in the measurements have been found to be acceptably low and, in conjunction with other measurement techniques, the system has made a valuable contribution to the assessment of velopharyngeal function. Additional measurements using this system are presently being developed. X-Ray and endoscopy examinations of velopharyngeal function have been extensively described.le5 Most techniques of assessment of velopharyngeal incompetence (VPI) are either difficult or impossible to quantify. An international working group’ has proposed a standard methodology for palatal measurements as a component of describing VPI. One of the principal features of the group’s proposal was that the measurement of velopharyngeal port closure should be ratiometric in nature. Figure 1 shows how the degree of port closure measured as a ratio is calculated from two measurements of absolute distance; the first is taken across the velopharyngeal port with the velum relaxed in the quiet nasal breathing position (giving the maximum open port dimension), and the second is taken from a subsequent image with the velum extended. From the ratio of these two measurements (b-b’ and a-a’), a simple index between 0 and 1, of port closure between maximal opening (0) and complete closure (1) can be calculated. The advantages of this ratiometric approach are the minimisation of errors in the imaging system (due to, for example, image distortion), nulling of systematic magnification factors and a resultant index that is dimensionless, enabling comparison of patients with different absolute port sizes. This paper introduces an extension to this meth" @default.
- W2469656581 created "2016-07-22" @default.
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- W2469656581 date "1994-01-01" @default.
- W2469656581 modified "2023-09-27" @default.
- W2469656581 title "Image analysis of lateral velopharyngeal normal palates closure in repaired cleft palates and" @default.
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