النشر العلمي

  • Sulieman M. S. Zobly, Yasser M. Kadah, "Compressed Sensing: Doppler Ultrasound Signal Recovery by Using Non-uniform Sampling & Random Sampling

     Several authors have shown that it is possible to reconstruct exactly a sparse signal from a fewer linear measurements, this method known as compressed sensing (CS). CS aim to reconstruct signals and images from significantly fewer measurements. With CS it’s possible to make an accurate reconstruction from small number of samples (measurements).

Doppler ultrasound is an important technique for non-invasively detecting and measuring the velocity of moving structure, and particularly blood, within the body. Doppler ultrasound signal has been reconstructed with CS by using random sampling and non-uniform sampling via ℓ1-norm to generate Doppler sonogram.

The result show that the recovered signals with non-uniform sampling are the same as the original signal, there is a loss of very small peaks, when random sampling used for recovering the signals, there is no significant different between the original signal and reconstructed one when we used more than 85% of the data, when less than 85% of the data used, the reconstructed signals and the original signal are different. The sonograms generated from the reconstructed signals with random and non-uniform sampling are same as the original one, but there are some losses in contrast. The error of the reconstructed images was calculated, the result shows that the error in the image decreased with increasing the number of samples. 

published in Proc. 28th National Radio Science Conference, IEEE,

  • Sulieman M. S. Zobly and Abdelbagi O. Osman, “planar Gamma Camera Uniformity Test Stability Based on Power Supply

Stability of power supply is one of the main problems affecting the performance and continuity of medical equipment in a developing country. Gamma camera is one of medical equipment uses radio isotope for patient imaging. There are various parameters degraded image quality in gamma camera. This paper discusses the effect of stability of power supply on image performance. To perform this work a total of 125 intrinsic uniformity tests for a gamma camera connected to stable power supply and a total of 125 intrinsic uniformity test for a gamma camera connected to an un-stable power supply were used. The integral uniformity (central and useful field of view) and differential uniformity (central and useful field of view) were calculated using 99mTc point source. The result shows that the quality of image degraded in unstable power supply; on the other hand gamma camera connected to the supply via uninterrupted power supply (UPS) was stable and gives highly uniform image in both central and useful field of view

published in Neuroscience and Biomedical Engineering Journal, vol. 4(E pub), 2016

  • Sulieman M. S. Zobly, “Accelerating Doppler Ultrasound Image Reconstruction via Parallelizing Compressed Sensing

Background: Doppler ultrasound is an important diagnostic tool used to view blood flow through the vessels. For the reconstruction we need to collect a large data to get a Doppler image with high performance.

Objective: In this work, we propose an algorithm that combines compressed sensing (CS) and parallel computing to reconstruct the Doppler ultrasound signal and reduce the reconstruction time.

Methods: Compressed sensing is a new sampling method, appeared a few years ago. CS has been applied in different practical applications such as speeding up MRI scans by acquiring less data to achieve a given amount of resolution and Doppler ultrasound signal reconstruction using fewer measurements to achieve an image with high quality. The main idea of parallel signal/image reconstruction is to divide the main tasks into subtasks and solve them concurrently, in such way that total time can be divided between total tasks.

Results: The result shows that as the number of cores increased the process time decreased. The image quality from serial programming is same as that a achieved by using parallel programming. The ℓ1-norm algorithm gives an image with best quality. The lowest reconstruction time was obtained by combining the regularized orthogonal matching pursuit (ROMP) algorithm and parallel computing, with a reconstruction time less than 0.016 seconds.

Conclusion: We have demonstrated that it is possible to combine compressed sensing and parallel computing to reconstruct the Doppler ultrasound signal. The result of reconstructing the Doppler signal shows that the combined algorithm leads to a reduction in reconstruction time and gives an image in real-time while reducing the computation complexity without affecting the image quality

published in Neuroscience and Biomedical Engineering Journal

  • A Novel Method for Synthesis of 4-(1,2,2-Trifluorovinyloxy)phenylboronic acid
Synthesis and characterization of 4-(1,2,2-Trifluorovinyloxy)phenylboronic acid was described. This arylboronic acid was prepared starting from commercially available 4-bromophenol in three steps, the first step developed by used Cs2CO3 as catalyst and DMSO as solvent. In the last steps the arylboronic acid was purified by crystallization with toluene to give high purity.

published in Gezira Journal of Engineering and Applied Sciences

  • A Novel Method for Synthesis of 4-(1,2,2-Trifluorovinyloxy)phenylboronic acid
Synthesis and characterization of 4-(1,2,2-Trifluorovinyloxy)phenylboronic acid was described. This arylboronic acid was prepared starting from commercially available 4-bromophenol in three steps, the first step developed by used Cs2CO3 as catalyst and DMSO as solvent. In the last steps the arylboronic acid was purified by crystallization with toluene to give high purity.

published in Gezira Journal of Engineering and Applied Sciences

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