Realistic Dynamic Numerical Phantom for MRI of the Upper Vocal Tract

Speaker-specific Typical Vocal Tract Shapes Obtained Using Dynamic MRI

Biomedical imaging techniques are applied to observe the hidden process of human articulation. We propose a new approach for obtaining a typical image for a phoneme’s articulation. We use vocal tract images captured using dynamic MRI, and by considering image spatial characteristics (intensities), we calculate the average of different instances of phoneme articulation. The obtained image presen...

the algorithm for solving the inverse numerical range problem

برد عددی ماتریس مربعی a را با w(a) نشان داده و به این صورت تعریف می کنیم w(a)={x8ax:x ?s1} ، که در آن s1 گوی واحد است. در سال 2009، راسل کاردن مساله برد عددی معکوس را به این صورت مطرح کرده است : برای نقطه z?w(a)، بردار x?s1 را به گونه ای می یابیم که z=x*ax، در این پایان نامه ، الگوریتمی برای حل مساله برد عددی معکوس ارانه می دهیم.

A fast and flexible MRI system for the study of dynamic vocal tract shaping.

PURPOSE The aim of this work was to develop and evaluate an MRI-based system for study of dynamic vocal tract shaping during speech production, which provides high spatial and temporal resolution. METHODS The proposed system utilizes (a) custom eight-channel upper airway coils that have high sensitivity to upper airway regions of interest, (b) two-dimensional golden angle spiral gradient echo...

Automated Segmentation of Upper Airways from MRI - Vocal Tract Geometry Extraction

A method for automatically extracting a triangulated surface mesh of the human vocal tract from 3D MRI data is proposed. The algorithm is based on a combination of anatomic landmarking, seeded region growing, and smoothing. More precisely, a mask is automatically created for removing unwanted details not associated with the vocal tract from the MRI voxel data. The mask then is applied to the or...

Evolution of reflexive signals using a realistic vocal tract model