Effect of ultrasonic instrumentation on causing crack of ceramic fused to metal crowns (In-vitro study)

Vibration of Ultrasonic has used for scaling and periodontal curettage, it is also has used for metal crown and metal-ceramic crown removal, subsequently, using the tips whether for scaling or removing crown, they will be in direct contact with this crown, This research aimed to evaluate the surface of metal-ceramic crown after exposure to Vibration of Ultrasonic tips.

Extraction and Determination of Polyphenols in Dry Olive Leaves using Ultrasound Apparatus

Total Polyphenol was studied in olive leaves collected from Lattakia area (AlQurdaha zone), where Phenolic compounds were extracted from dry Olive leaves by using two extraction methods: maceration and Ultrasonic Device. By the both two methods a study was carried out on the extraction solvent concentration effect where the extraction was done by using the mixture of Ethanol-Water with different percentages (60,70,80 %). As well, The extraction temperature effect was studied at the both methods at (20,30, 40°C); in addition to the study of the extraction time effect. At the method of Maceration Extraction, the total polyphenols amount was studied in dry olive leaves after extraction during different times (24,48,72 h). While at the Ultrasonic Extraction the times were (10,20,30 min). The study showed that the highest amount of phenolic compounds were existed in dry olive leaves which were extracted by Ultrasonic Waves with the concentration of the solvent ethanol-water 80%, temperature of 40°C, and with an extraction time of 20min.

Surgical Treatment of Superficial Veins Thrombosis ( SVT ) in patients with Varicose Vein of the lower extremities

Sample of 60 evaluable patients were included in a prospective study with Superficial Veins Thrombosis(SVT)on ground of varicose vein lower extremities. the study achieved at AL-Assad hospital (Latakia) in the period between January 2005 to December 2011. Criteria of inclusion were incompetence (by Duplex investigation ), a tender indurated cord a long superficial vein, and indurated and heat in the affected area. Exclusion criteria were obesity, cardiovascular or neoplastic diseases, non-ambulatory status, SVT without varicose vein. 60 patients ( 41 females, 19 males) included in the study, 61.6% were between(31–50) years, left lower limb was affected in 48,3 %, Right 40%, and in 11,7 the both, The GSV was affected alone in all cases. Primary surgical choice was decided almost in all patients, secondary was in 4patients after 1-4 weeks of medical treatment. The extension level in the GSV determined by color duplex ultrasound was similar to surgical findings, and above clinical extension level in (5-14) cm. All surgical intervention was achieved under spinal anesthesia, with no major technical difficulties. Short term results were good, no(DVT, PE, acute cardiac ischemia, death ), complications related to surgery(hematoma, seroma5%, wound infection3.3%, wound necrosis1.7%, lymphatic discharge3.3%) show no difference to un complicated varicose surgery. Conclusion: Primary surgical approach can be used with thrombosis of GSV above knee in varicose patients safely and effectively , color duplex ultrasound scans is recommended to determine extension of SVT.

Study of effect of ultrasound weaves on dyeing polyester with disperse dyes

In this study we used ultrasonic technology as a means of enhancing dyeing process efficiency of polyester fibers with disperse dyes, which had frequency 42kHz and, we studied the behavior of dye when the polyester dyed with (US) and with traditional dyeing methods (without US).

Auto-Detection of Femur Length Using Ultrasound Image Processing Techniques

This Paper offers an effective method to measure the length of the femur in Fetal Ultrasound Images, it applies a series of steps starting with the reducing amount of noise in these images, and then converted them to a binary form and uses morphological operations to segment the femur and isolate it from the rest of the image objects, then it applies an Edge Detector in order to find the edges of the bone, then uses the Hough Transform to detect straight lines in the image. we apply overlapping for resulted lines on the original image, finally we choose the most significant and longest straight line which is corresponding to the length of the femur. The proposed method facilitates the measurement of the femur without the help of a physician through a series of steps.

Auto Measurement and Segmentation of Head Region in Fetal Ultrasound Images

This Paper offers an innovative way for auto segmentation of the fetal head in ultrasound US images. There is high amount of noise in US images, which it affects the visual appearance of the area of head. The research depends on auto segmentation mechanism without the need for user intervention at any stage of proposed method, so this is what makes segmentation process is difficult and important at the same, because the weakness of the edges and not fully enclosed in the desired region. We relied on a Level Set method to segment the head area, after determining the initial contour automatically by the Region Properties Function. The proposed method proves effective in the head area segmentation without being influenced by noise or the existence of discontinuities in the edges of the head, despite the absence of a pre-processing stage in a series of steps applied to several ultrasound images in different sizes and sources. The last step is to calculate the secondary diameter of the output ellipse (the fetal head sector) depending on the properties of the region, and this final measurement represents the Bi Parietal Diameter BPD, an important measure enables the physician to assess gestational age and determine the birth of the fetus date. Segmentation result has been authenticated based on similarity criteria, and the final measurement accuracy has been compared with manual measurements carried out by a specialist. The comparison results showed the effectiveness of the proposed algorithm and its success by up to 98%.

A Study of the effect of ultrasound Waves on the bleaching and mercerization Processes of Raw fabrics Made of cotton Yarns

Bleaching process of cotton fabrics consider an important and sensitive operations in wet chemical treatments of cotton fabrics, mercerization is not less important than them and that in cases in which is made necessary, but from the problems of these processes are long time and consumption of energy, but the ultrasound energy contribute to reduce these problems.

Medical Imaging Role in Renovascular Hypertension Diagnosis

Renal artery stenosis is an important clinical entity. its importance lies in that it may be a treatable cause of hypertension, and it is -when progress- a cause of chronic renal failure. The causes of renal artery stenosis are numerous, the most common are: atherosclerosis and fibromuscular dysplasia (accounts for more than 95% of cases). Digital Subtraction Angiography (DSA) is the standard reference in the radiologic diagnosis of renal artery stenosis, but it carries the risk of being invasive procedure. Doppler ultrasound is used in the evaluation of the renal arteries, and it has the advantage of being non-invasive and inexpensive.

Modeling and Simulation of Acousto-Optic Tunable Filter For WDM Applications

Optical filter is one of the most accurate and important elements in pure optical communication network which uses wavelength division multiplexing (WDM). This research includes studying Acousto Optic Tunable Filter (AOTF) in linear anisotropic medium, which depends on the interaction principle between optical waves and acoustic waves. This paper describes simulating and testing the AOTF in MATLAB/Simulink software which is a strong tool for simulating and designing various systems. We have achieved an AOTF model, and created special block which could be added to MATLAB Simulink Library. We have also evaluated the performance of this filter and its ability to select one wavelength between the set combined by WDM. Moreover, we have studied the effect of acoustic wave frequency, its velocity, the properties of the crystal used in manufacturing it, and other influent parameters, along the selected wavelength.

Prediction of preterm birth by estimating ultrasonographic cervical changes

The study is carried on 65 pregnant patients attending the outpatient clinics and inpatient department of Obstetrics and Gynecology of Al Assad University Hospital from February- 2013 until February- 2014. They were divided to three groups. The first is preterm labor with intact membranes (25 patients). The second is PROM (20 patients). The third one is control group (20 patients). All of them were submitted to ultrasonography to find cervical changes (cervical canal length and diameter of internal os in order to predict preterm delivery. Cervical canal length has a sensitivity of 91.43%, a specificity of 100%, a positive predictive value of 100%, a negative predictive value of 76.92%, and a relative risk (95% CI) of 4.33 (1.61-11.69) among patients with short cervical canal length and those with normal cervix. Diameter of internal os as a predictor of preterm delivery has a sensitivity of 60%, a specificity of 60%, a positive predictive value of 84%, a negative predictive value of 30%, and a relative risk (95% CI) of 1.2 (0.86–1.68).