Two Dimensional Ultrasonic Beam Distortion in the Breast: In Vivo Measurements and Effects
| Autor: | P D, Freiburger, D C, Sullivan, B H, LeBlanc, S W, Smith, G E, Trahey |
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| Rok vydání: | 1992 |
| Předmět: |
Radiological and Ultrasound Technology
Signal Processing Computer-Assisted Middle Aged 01 natural sciences 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine 0103 physical sciences Humans Female Radiology Nuclear Medicine and imaging Ultrasonography Mammary Technology Radiologic 010301 acoustics |
| Zdroj: | Ultrasonic Imaging. 14:398-414 |
| ISSN: | 1096-0910 0161-7346 |
| Popis: | Two dimensional arrival time data was obtained for the propagation of ultrasound across the breasts of 7 female volunteers. These profiles were extracted through the use of cross-correlation measurements and a simulated annealing process that maintained phase closure while aligning the data. The phase aberration measured in two dimensions had a larger magnitude than previously reported phase aberration measured in one dimension in the breast A point spread function generation computer program was used to demonstrate the system response degrading effects of the measured phase aberration and the usefulness of current one dimensional phase aberration correction techniques. The results indicate that two dimensional correction algorithms are necessary to restore the system performance losses due to phase aberration. |
| Databáze: | OpenAIRE |
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