Papers by Abdalmajeid Alyassin
Measurement of natural and artificial radioactivity in powdered milk consumed in Jordan and estimates of the corresponding annual effective dose
Radiation Protection Dosimetry, Nov 7, 2009
The activity concentrations of (40)K, (226)Ra, (228)Ra and (137)Cs were measured for 14 brands of... more The activity concentrations of (40)K, (226)Ra, (228)Ra and (137)Cs were measured for 14 brands of the powdered milk consumed in Jordan, which are imported from various regions around the world. The activity concentrations of (40)K were found not to vary greatly from one brand to the other with an average of 348 +/- 26 Bq kg(-1). However, the activity concentrations of (137)Cs revealed a geographical distribution being: (i) undetected in any of the samples from Argentina, (ii) uniformly distributed in samples from Europe with an average of 0.43 +/- 0.05 Bq kg(-1), and (iii) widely varying in samples from New Zealand (from being not detected (ND) to 1.55 Bq kg(-1)). (226)Ra and (228)Ra were measured above the detection limits in five brands only and displayed relatively low activity concentrations of 0.50-2.14 and 0.78-1.28 Bq kg(-1) for (226)Ra and (228)Ra, respectively. The total average annual effective doses due to intake of (40)K, (226)Ra, (228)Ra and (137)Cs from the ingestion of the powdered milk for infants, children and adults were estimated to be (in microSv): 332, 138 and 43, respectively. These results indicate no significant radiation dose to the public.
This research aims to study gamma radiography feasibility in mammography through simulation. GATE... more This research aims to study gamma radiography feasibility in mammography through simulation. GATE simulation package was used to define the feasibility limits and to test several parameters including energy range, activity, source size and dose. An ACR-like mammography phantom was generated in simulation and the produced images were used for visual and analytical assessments. Some images were processed and enhanced by an application developed using the Visualization Toolkit. A special technique was developed to correct the gamma radiation field inhomogeneity and a morphological operator based technique was used to automatically extract regions of interest from the simulated images to estimate the contrast and signal-to-noise ratio. The results of the analytical and visual assessments demonstrated that gamma radiation of 35 keV energy or less produces acceptable mammography images. Higher energy photons produced mammography images but did not pass the rigorous clinical acceptable tes...
Radiation Protection Dosimetry, 2009
The Jordan Rift Valley (JRV) is considered the food bowl of Jordan, especially during the winter ... more The Jordan Rift Valley (JRV) is considered the food bowl of Jordan, especially during the winter season. In this study, soil and vegetable samples collected from greenhouses in the northern JRV were analysed for their radioactive content. The activity concentrations of 238
Diabetes, 1992
In this study, total body fat content and fat topography were related to glucose metabolism in th... more In this study, total body fat content and fat topography were related to glucose metabolism in the basal and insulin-stimulated states in 18 nonobese and 18 obese premenopausal nondiabetic women. All subjects received a euglycemic insulin (20 mil • min 1 • m 2) clamp study in combination with [3-3 H]-D-glucose infusion and indirect calorimetry to quantitate total body glucose uptake, glucose oxidation, and nonoxidative glucose disposal. Total body fat content was determined with tritiated water, whereas body fat distribution was estimated from the WHR, the STR, and the VSR (measured by magnetic resonance imaging). In the postabsorptive state, total body glucose utilization, glucose oxidation, and nonoxidative glucose disposal rates were similar in nonobese and obese women, whereas during the insulin clamp all three metabolic parameters were reduced significantly in the obese group. In nonobese women, total body fat content was related inversely to both total and nonoxidative glucose disposal during the insulin clamp, whereas no relationship was found between glucose metabolism (total, oxidative, and nonoxidative) and WHR, STR, or VSR. In contrast, in obese women, no relationship was observed between total body fat content and any measure of insulin-mediated glucose metabolism. However, both WHR and VSR were related inversely to total, oxidative, and nonoxidative glucose disposal rates during the insulin clamp. These results suggest that total body fat content and body fat
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 2022
The purpose of this research is to investigate the feasibility of using low contrast agent concen... more The purpose of this research is to investigate the feasibility of using low contrast agent concentration with X-ray computed tomography in visualizing and diagnosing the human vascular system while minimizing the risk of toxicity to the patient. This research investigated the effect of several iodine contrast agent concentrations on the ability to extract and visualize human vessels using simulated computed tomography scans. Monte Carlo simulation was used to perform these computed tomography acquisitions. The simulated patient was based on actual computed tomography angiography data, where a technique was developed to simulate brain vessels with contrast agents ranging from 0 mg to 20 mg of iodine. The simulation used segmented patient data along with basic image processing techniques to model the various levels of iodine concentrations. Cone beam computed tomography projections of a patient injected with and without iodine were acquired in the simulations. Subtraction of the corresponding projections was performed to generate images caused by the contrast agent. Then, histogram analysis of these differences was used to assess the validity of extracting and visualizing the human vessels. The smallest amount of iodine, 0.5 mg, helped better visualize the brain vessels and 2 mg of iodine was high enough to show almost 90% of the vessels. Additionally, the vessels were clearly visible in all the subtracted images. This research showed very promising outcomes in using low concentrations of iodine. Thus, this study proposes for the pharmaceutical companies and others interested to clinically investigate and evaluate the efficacy of using low concentrations of iodine and the associated side effects.
Method, system and computer program product for multi-modality registration using virtual cursors
Mehrmodalitäts X-ray and nuclear medical mammography imaging system and method
A Mehrmodalitatsabbildungssystem (1) comprises an X-ray imaging subsystem (3) and a nuclear medic... more A Mehrmodalitatsabbildungssystem (1) comprises an X-ray imaging subsystem (3) and a nuclear medicine imaging subsystem (5). The X-ray imaging subsystem (3) may be a Tomosynthesesubsystem. The system may be used for mammography imaging, so that the X-ray imaging subsystem (3) and the nuclear medical imaging subsystem (5) for imaging a breast by a compression paddle (41) compressed breast are set up.
Method and system for three dimensional tomosynthesis imaging
Method and apparatus for determining an unsupervised planar geodesic path
Measurement of Abdominal Fat with Magnetic Resonance Imaging
Invest Radiol, 1990
Method and system for unsupervised transfer function generation for images of rendered volumes
Volume and Surface Measurements from Tomographic Images: in Vivo Validation of AN Unsupervised Method
ABSTRACT
Unsupervised Method of In Vivo Urine Volume Estimation Using MRI
Visualization of In Vivo 3-D Thermal Mapping Using MRI
3-D Visualization of In Vivo Thermal Mapping Fused With Anatomical Structures Using MRI
Iterative Determination of the Shortest Path Between Two Points on a Polygonal Surface
Method And System for Diagnosing Faults in Imaging Scanners
Method and system for diagnosing trouble in imaging device
Detect Surface Points of an Ultrasound Image
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Papers by Abdalmajeid Alyassin