55 research outputs found

    Cardiac Hydatid cyst without liver involvement: A case report

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    Hydatid disease is a rare parasitic disease, which mainly involves liver then lung tissues. Cardiac involvement is very rare, especially when there is not hepatic in-volvement. We describe a 47-year-old woman with a history of a lung hydatid cyst who was referred to Rajaei Heart Center, Tehran, Iran in 2012. Her chest computed tomographic scan showed a cardiac mass. Echocardiographic exami-nation illustrated a large, well-defined heterogeneous mass (4.5 � 2.5 cm) in the roof of the right atrium with attachment to the crista terminalis without com-pressive effect on the inferior and superior venae cavae. The patient was candi-date for open-heart surgery via median sternotomy. A cystic mass was observed in the lateral aspect of the right atrial wall. After an injection of hypertonic nor-mal saline into the cystic lesion, the mass was excised totally. The right atrial de-fect was reconstructed with autologous pericardium. The patient was discharged from the hospital in good condition. Histological examination confirmed the di-agnosis of the hydatid cyst. © 2016, Tehran University of Medical Sciences (TUMS). All rights reserved

    Comparative insight into the interfacial phase evolutions during solution treatment of dissimilar friction stir welded AA2198-AA7475 and AA2198-AA6013 aluminum sheets

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    In the current research, dissimilar friction stir welded (FSW) sheets of AA2198-AA7475 and AA2198-AA6013 were solution treated at 460–580◦C for 1 h. Annealing at 580◦C led to complete degradation of both dissimilar weldments from the AA2198 side. According to the microstructure inspection, solution treatment triggered abnormal grain growth within the stir zone (SZ), and applying higher treatment temperatures enhanced the fraction of transformed grains. SEM analysis revealed that the pre-melting of grain boundaries (GBs) over 540◦C encouraged the diffusion of solute atoms to the GBs. The massive diffusion of Cu to the GBs led to the formation of Cu-rich eutectic phases in AA7475 and AA2198 and dense Cu-rich particles in AA6013. In the meantime, the diffusion of Mg and Zn to the GBs of AA7475 and Fe and Si to the GBs of AA6013 eventuated in the formation of coarse particles at the GBs which, in return, attenuated the bonding adhesion of the grains at SZ. The formation of remarkable Cu-rich phases in the pre-melted regions and significant contraction of the eutectic phase while cooling as well as the formation of particles at GBs resulted in intergranular failure of the joints from the AA2198 side of the SZ

    Mid-term patency in radial artery and saphenous vein after coronary artery bypass grafting in asymptomatic patients using 128-slice CT coronary angiography

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    Background: Patency of the revascularization conduit is an essential predictor of long-standing survival after coronary artery bypass grafting. Objectives: We have conducted this study to compare the mid-term patency rates of radial artery (RA), left internal thoracic artery (LITA) and also saphenous vein (SV) grafts in asymptomatic patients following coronary artery bypass graft surgery (CABG) undergoing total IV anesthesia. Patients and Methods: In this study, 30 three-vessel disease patients with 104 RA, LITA, and SV grafts used concomitantly for primary isolated non-emergent CABG surgery were assessed. The primary end point was CT angiographic graft patency rate. After 53.5 (24-97) months� follow-up, graft patency was assessed using 128-slice CT coronary angiography. Logistic regression analysis was used to detect the independent predictors of graft failure. Results: A total of 104 grafts, including 30 LITA, 44 SV, and 30 RA grafts, were studied. Cumulative graft patency rates were 93.3 in LITA, 83.3 in RA, and 70.5 in SV grafts. Statistically significant difference was found between the LITA and the SV graft patency rates (P = 0.019), whereas the difference between the RA conduit patency and the LITA or SV graft patency rates did not have any statistical significance (P = 0.424 and P = 0.273, respectively). Independent predictors of RA grafts occlusion were native coronary stenosis < 70 and female gender. Conclusions: In our patients, the RA grafts had an acceptable patency rate in 2 to 5 years� follow-up. Although the SV grafts had a relatively higher patency rate than RA grafts in our asymptomatic patients, the patency rates in RA and SV grafts were close to each other. The RA graft function was poor in the patients with a higher number of risk factors and in the females. © 2015, Iranian Society of Regional Anesthesia and Pain Medicine (ISRAPM)

    A monte carlo platform for characterization of x-ray radiation dose in ct imaging

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    Background: Computed tomography (CT) is currently known as a versatile imaging tool in the clinic used for almost all types of cancers. The major issue of CT is the health risk, belonging to X-ray radiation exposure. Concerning this, Monte Carlo (MC) simulation is recognized as a key computational technique for estimating and optimizing radiation dose. CT simulation with MCNP/MCNPX MC code has an inherent problem due to the lack of a fan-beam shaped source model. This limitation increases the run time and highly decreases the number of photons passing the body or phantom. Recently, a beta version of MCNP code called MCNP-FBSM (Fan-Beam Source Model) has been developed to pave the simulation way of CT imaging procedure, removing the need of the collimator. This is a new code, which needs to be validated in all aspects. Objective: In this work, we aimed to develop and validate an efficient computational platform based on modified MCNP-FBSM for CT dosimetry purposes. Material and Methods: In this experimental study, a setup is carried out to measure CTDI100 in air and standard dosimetry phantoms. The accuracy of the developed MC CT simulator results has been widely benchmarked through comparison with our measured data, UK�s National Health Service�s reports (known as ImPACT), manufacturer�s data, and other published results. Results: The minimum and maximum observed mean differences of our simulation results and other above-mentioned data were the 1.5, and 9.79, respectively. Conclusion: The developed FBSM MC computational platform is a beneficial tool for CT dosimetry. © 2021, Shriaz University of Medical Sciences. All rights reserved

    The association between increased carotid intima-media thickness and SYNTAX Score in coronary artery disease: A single center study

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    Background: Carotid artery lesions frequently coexist with coronary arterial disease (CAD). The aim of this study was to investigate the relation between carotid intima-media thickness (CIMT) and the extent of CAD and whether CIMT could be predictive of severity of coronary atherosclerosis. Methods: Coronary angiography and carotid ultrasound evaluations of 100 consecutive patients with CAD who had undergone elective coronary angiography were reviewed. IMT was measured at both carotid arteries. CIMT and severity of CAD relationship based on SYNTAX score was assessed. The relation between CIMT and cardiovascular risk factors was determined. Results: Mean overall SYNTAX score was 15.76 + 4.82. Mean right CIMT was 0.86 ± 0.29 and mean left CIMT was 0.83 ± 0.24. There were no significant correlation between the SYNTAX score and CIMT (r: 10, P: 30). There was significant relationship between hypertension,diabetes and CIMT (P: 0.01). Conclusion: we found no relationship between CIMT and SYNTAX score in patients who underwent coronary angiography. Diabetes mellitus and hypertension are related to increased carotid intima-media thickness. © 2018

    The association between increased carotid intima-media thickness and SYNTAX Score in coronary artery disease: A single center study

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    Background: Carotid artery lesions frequently coexist with coronary arterial disease (CAD). The aim of this study was to investigate the relation between carotid intima-media thickness (CIMT) and the extent of CAD and whether CIMT could be predictive of severity of coronary atherosclerosis. Methods: Coronary angiography and carotid ultrasound evaluations of 100 consecutive patients with CAD who had undergone elective coronary angiography were reviewed. IMT was measured at both carotid arteries. CIMT and severity of CAD relationship based on SYNTAX score was assessed. The relation between CIMT and cardiovascular risk factors was determined. Results: Mean overall SYNTAX score was 15.76 + 4.82. Mean right CIMT was 0.86 ± 0.29 and mean left CIMT was 0.83 ± 0.24. There were no significant correlation between the SYNTAX score and CIMT (r: 10, P: 30). There was significant relationship between hypertension,diabetes and CIMT (P: 0.01). Conclusion: we found no relationship between CIMT and SYNTAX score in patients who underwent coronary angiography. Diabetes mellitus and hypertension are related to increased carotid intima-media thickness. © 2018

    Dilated cardiomyopathy as a rare presentation of the pulmonary sequestration: A case report with aberrant vessel from aorta to left lower pulmonary lobe

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    Late onset non-ischemic cardiomyopathy is a rare manifestation of the presence of aberrant vessel from descending thoracic aorta to left lower lobe of lung. This congenital anomaly is associated with pulmonary sequestration. Our case was a 23-year-old male who was under observation since the age of 19 years for evaluation of shortness of breath, functional class II. He had history of professional athletic training and he denied consumption of any compound. Ejection fraction had deteriorated during three years from 45�50 to 40 and left ventricular size increased from normal size to mild enlargement. Cardiac computed tomography showed presence of aberrant artery from descending aorta to left lower pulmonary lobe with pulmonary sequestration. His cardiac function improved after successful coil embolization of aberrant vessel. In conclusion, pulmonary sequestration and aberrant pulmonary supply from aorta should be considered as a rare cause of dilated cardiomyopathy which can be reversible by proper intervention. © 2019 Japanese College of Cardiolog

    Evaluation of visibility of foreign bodies in the maxillofacial region: Comparison of computed tomography, cone beam computed tomography, ultrasound and magnetic resonance imaging

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    Background: Detection of foreign bodies (FBs) is challenging. Selection of a fast and affordable imaging modality to locate the FB with minimal patient radiation dose is imperative. Objectives: This study sought to compare four commonly used imaging modalities namely cone beam computed tomography (CBCT), magnetic resonance imaging (MRI), computed tomography (CT), and ultrasound (US) for detection of FBs in the head and neck region. Materials and Methods: In this in vitro study, iron, glass, stone, wood, asphalt, and tooth samples measuring 0.1 � 0.5 � 0.5 cm were placed in the tongue muscle, soft tissue-bone interface and nasal cavity in a fresh sheep�s head and subjected to MRI, US, CT and CBCT. A total of 20 images were captured by each imaging system from the six materials in the afore-mentioned locations. The images were observed by an expert oral and maxillofacial radiologist and a general radiologist. To assess reliability, 20 images were randomly observed by the observers in two separate sessions. The images were classified into three groups of good visibility, bad visibility and invisible. The data were analyzed using SPSS version 18, Wilcoxon Signed Rank, Pearson chi square, and Fisher�s exact tests. Results: All FBs in the tongue and at the soft tissue-bone interface had good visibility on US (P = 1.00). Also, CBCT and CT had significantly different performance regarding FB detection (P < 0.001). All wooden samples in the nasal cavity were invisible on CT scans; while, only 20 of them were invisible on CBCT scans. MRI showed significant differences for detection of FBs in the three locations (P < 0.001). MRI could not locate iron samples due to severe artifacts and only showed their presence (bad visibility) but other FBs except for wood and tooth in the nasal cavity (100 invisible) had good visibility on MRI. Conclusions: Ultrasound is recommended as the first choice when FB is located within the superficial soft tissues with no bone around it. In case of penetration of FB into deeper tissues or beneath bone, CT or CBCT are recommended. Otherwise, considering lower dose, CBCT is preferred over CT. We can use MRI if the FB is not ferromagnetic. However, CT is the first choice in emergency situations because of higher sensitivity. © 2016, Tehran University of Medical Sciences and Iranian Society of Radiology
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