النشر العلمي

  • Sulieman M. S. Zobly and Abdelbagi O. Osman, “Radioactive dose measurement based on SPECT gamma camera: patient dose

A dose measurement is one of the main steps in nuclear medicine imaging, which is done before the injection of patient. There are different types of instrument used for dose measuring; the most common instrument used in nuclear medicine is a dose calibrator. So as to get accurate value of the measured dose, the dose calibrator has to be well calibrated. In most cases we need to send the dose calibrator from time to time to the manufacture, standardized organization or reference laboratory for calibration. Calibrating the dose calibrator in our department even in Africa is a challenge. Thus for calibrating the dose calibrator we need to send the instrument to the manufacturer, which is cost a lot and takes time. In this work we want to make use of SPECT gamma camera for measuring the patient dose in nuclear medicine department instead of using dose calibrator to avoid stopping the work during sending the dose calibrator to the company for calibration or during the machine break down. We developed an equation enable us to measure the amount of patient dose using SPECT gamma camera. There is no significant different between SPECT gamma camera and does calibrator when they used for measuring the patient dose. The proposed algorithm validated using different patient doses. The proposed dose measurement algorithm gives the same reading that gained with dose calibrator.

published in Gezira journal of health science, vol. 11(2),

  • Sulieman M. S. Zobly and Yasser M. Kadah, “Clutter Rejection for Doppler Ultrasound Based on Blind Source Separation

Doppler ultrasound is widely used diagnostic tool for measuring and detecting blood flow. To get a Doppler ultrasound spectrum image with a good quality, the clutter signals generated from stationary and slowly moving tissue must be removed completely. Without enough clutter rejection, low velocity blood flow cannot be measured, and estimates of higher velocities will have a large bias. In most cases it is very difficult to a chive a complete suppression without affecting the Doppler signal. Usually finite impulse response FIR, infinite impulse response IIR and polynomial regression PR filters were used for cluttering. In this paper we proposed a new method for clutter rejection in Doppler ultrasound to subtract all the clutter so as to achieve more accurate flow estimation. We proposed a new clutter rejection based on blind source separation using principal component analysis (PCA) and independent component analysis (ICA) methods. The proposed clutter was implanted to reduce the clutter originated from moving structure and backscattered flow, beside FIR, IIR and PR. The proposed clutter rejection method presentation is quantified in simulated FR Doppler data beside real Doppler data (heart data). The result shows that the proposed method gives better clutter rejection over other present types of clutters

published in Journal of Medical Imaging and Health Informatics, vol. 3 (2)

  • Sulieman M. S. Zobly, A. Omer, “Effect of Different Parameters on Intrinsic Uniformity Test for Mediso

The most basic and sensitive routine quality control (QC) of gamma camera is that of intrinsic uniformity. Intrinsic uniformity must be assessed daily and after each repair, it must be critically evaluated and any necessary action must be undertaken before using the gamma camera for patient imaging. The main objective of this work is to determine the best parameters for daily quality control testing of intrinsic uniformity for the single-head gamma camera from MEDISO Company installed at Institute of Nuclear Medicine - University of Gezira. Intrinsic uniformity test was done by placing a point source 99mTcO- (99mTc) in front of the detector with removed collimator to measure the effect of correction matrix, source-to-camera distance, a count rate and activity volume on intrinsic uniformity.The result shows that the best intrinsic uniformity image obtained at distance of 100 cm, with correction matrix, activity volume in range of 0.1 - 0.4 ml in 3 ml syringe and a count rate in between 25 - 30 kcps which takes less than 14 min to get uniform image

published in Internet Journal of Nuclear Medicine. 2009 Volume 5 Number 2.

  • Sulieman M. S. Zobly, Abdu Omer, “Development of a Simulated Method for Continuous Monitoring of Radiation in the Nuclear Medicine Department Medani

Generally, radiations emit from different sources of energy. Some of these radiations are very dangerous. They may lead to many diseases like cancer. Many nuclear institutes over the world have been established for the purpose of diagnostic and treating by using radioisotopes. The optimization of staff protection is essential in the nuclear medicine department to minimize the effect of the radiation to the department staff and to other people. In all around the world, detectors are used to monitor the radiation.

This paper is discussing a microcontroller simulated system; the system was established by situating four detectors in the department of nuclear medicine to monitor the injected patients with Tc 99m. Gamma photons are converted into pulses at the output of the detectors, and then they are transmitted to the microcontroller to define the radiated area. If any of this injected patient inter to a non-radiated area, the detector issues an alarm and red colour in the monitoring room. Moreover, the area number is displayed in the liquid cathode display (LCD) of the microcontroller.

published in Gezira j. of eng. & applied sci. 4(1)

  • Sulieman M. S. Zobly and Abdu Omer, “Developing an Induction Heating & Hardening System

The aim of this paper is to discuss the developing of a new induction heating &

hardening system to harden a shallow depth o

f stainless steel that used to manufacture

surgical blades. The system has been designed to satisfy the requirement for this

application by using radio frequency generator, current transformer and inductor coil.

These three parts represent the main part of

the system which is known as induction

heating system. The system is connected to a temperature measurement device to control

the system by limiting the temperature during the process of heating up the material to

very high temperature and cool it rapidly

, to satisfy the required characteristic for

quenched material. Using this method, the process time is very short, yielding high

quality. The results of the experiment show that the designed system is faster than all

other types of induction heating system

s that can harden only one side of the material.

This design was conducted at University of Applied Science, Soest Division

Germany.

published in Gezira Journal of Engineering & applied science – University of Gezira

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