Use of Nonlinear Frequency Modulated Signals for the Enhancement of Subharmonic Response from Contrast Microbubbles
Journal Title: Mehran University Research Journal of Engineering and Technology - Year 2017, Vol 36, Issue 1
Abstract
Ultrasound imaging with the subharmonic component from contrast microbubbles provide improved CTR (Contrast-to-Tissue Ratio), however it is susceptible to the low amplitude of the subharmonic component. In this simulation study, NLFM (Nonlinear Frequency Modulated) signals are proposed in order to enhance the subharmonic response from microbubbles. NLFM signals having fractional bandwidths of 10, 20, and 40% with up and down sweeps were used as excitation. The performance of NLFM signals were compared with the reference tone-burst and LFM (Linear Frequency Modulated) signals. The results show that the ultrasound contrast microbubbles can produce subharmonic response which is dependent on the applied signal pressure and bandwidth. It is observed that the subharmonic component of the scattered NLFM signal is 3.2dB higher than the LFM signal, whereas it is 9dB higher compared to the sinusoidal tone-burst signal. The results are also presented which show that the up and down sweeps NLFM signals performed better than the LFM signals at the same acoustic pressure and bandwidth.
Authors and Affiliations
Muhammad Arif, Muhammmad Asim, Farida Memon
Keywords
Related Articles
- EP ID EP196552
- DOI 10.22581/muet1982.1701.18
- Views 102
- Downloads 0
Wi-Fi Fingerprinting Based Room Level Indoor Localization Framework Using Ensemble Classifiers
Over the past decennium, Wi-Fi fingerprinting based indoor localization has seized substantial attention. Room level indoor localization can enable numerous applications to increase their diversity by incorporating user...
Effects of Process Parameters on Ozone Washing for Denim using 33 Factorial Design
Denim garment is getting popular day by day. It is highly demandable because of its versatility, comfort and durability. Different techniques of denim washing increase this demand drastically. Denim washing is the proces...
Pulse Equivalent Area Based Orientation of a Class of Under-Actuated System under Constraints
A PEA (Pulse Equivalent Area) approach for orientation control of an under actuated pointing device is proposed. The presented work is a sequel to the earlier work done by the authors for the orientation control of the d...
A Digital Diary: Remembering the Past Using the Present Context
Lifelog devices have gained much attention in recent past. These devices are capable of recording daily activities of a user such as visited places, calories burnt, heart rate, etc. However, reminiscing the past life fro...
A Novel Parallel Algorithm for Edit Distance Computation
The edit distance between two sequences is the minimum number of weighted transformation-operations that are required to transform one string into the other. The weighted transformation-operations are insert, remove, and...