Overview radiography of abdominal organs in dogs and cats

2020 ◽  
Vol 1 (4) ◽  
pp. 6-14
Author(s):  
V. N. Baymatov ◽  
◽  
A. V. Metelev ◽  
Keyword(s):  
Barium Sulfate ◽  
Bile Ducts ◽  
Individual Characteristics ◽  
Correct Selection ◽  
X Ray ◽  
Abdominal Organs ◽  
Modern Methods ◽  
Extrahepatic Bile Ducts ◽  
Selection Of

Today, less attention has been paid to x-ray studies of animals in connection with the advent of more modern methods. At the same time, the quality of radiopaque substances decreased, which is reflected in this article. The Omnipack, Urografin, Visipack, Barium sulfate, Iodipamide, Bilignost and Biligrafin used in radiopaque contrast studies in most cases did not reveal the hepatobiliary system. Only the last two drugs gave satisfactory results. The complexity of the X-ray examination of the biliary system in cats and dogs lies in the features of the location of the extrahepatic bile ducts and the condition of the intestine, the size of the liver, its structure, echogenicity, the state of the vessels and surrounding organs. In this work, we took into account the anatomical variants of the development and location of organs in animals, which may complicate the study or evaluation of the data obtained. These included changes in the contours, shape, location of the gallbladder and its filling. The results obtained were compared with the available general species standards, taking into account the possible individual characteristics of each animal. Other studied drugs gave satisfactory results with an overall assessment of the abdominal organs, but we preferred Omnipack. Survey radiography provides a large amount of information with the correct selection of radiopaque substances.

scholarly journals For the 30th anniversary of laparoscopic cholecystectomy: problems remain

2019 ◽  
Vol 100 (3) ◽  
pp. 537-541
Author(s):  
I V Fedorov ◽  
A N Chugunov ◽  
L E Slavin ◽  
D A Slavin ◽  
V I Fedorov
Keyword(s):  
Laparoscopic Cholecystectomy ◽  
Bile Ducts ◽  
Perioperative Complications ◽  
Open Cholecystectomy ◽  
Intrahepatic Bile Ducts ◽  
Negative Effect ◽  
Iatrogenic Damage ◽  
Extrahepatic Bile Ducts ◽  
Legal Costs

The review describes perioperative complications of laparoscopic cholecystectomy. Over the past 30 years, laparoscopy has become the «gold standard» for cholecystectomy and one of the most frequently performed procedures in abdominal surgery. Nevertheless, despite the advantages of the method, it has an «Achilles heel» - the frequency of iatrogenic damage to the extrahepatic bile ducts is 3-5 times higher than with an open cholecystectomy. This complication has a negative effect on the survival of patients after surgery, leads to deterioration in the quality of life and is a major source of legal costs in many countries. In general, the total range for any damage to the biliary tract during laparoscopic cholecystectomy is 0.32-0.52%, while the complication rate and mortality rate are 1.6-5.3% and 0.08-0.14%, respectively. Patients who have undergone a complete intersection of the hepaticoholedochus, become «bile cripples» for life. Recurrent cholangitis, strictures of anastomoses with a possible outcome in liver cirrhosis are quite likely in later periods after damage to the intrahepatic bile ducts. Technological efforts to improve the results of laparoscopic cholecystectomy reside. These include the routine use of intraoperative cholangiography, infrared fluorescent cholangiography, etc. Nevertheless, despite the growing number of methods designed to reduce these complications, evidence of their effectiveness remains limited. The most important factors ensuring the safety of laparoscopic cholecystectomy are recognized: understanding of anatomy, adequate exposure when using electrosurgery, psychological readiness to invite a senior colleague in time for help, the ability to recognize a situation that requires conversion and rejection of laparoscopy.

Measurement of High Thermodynamic Temperatures in the DLR Solar Furnace by UV-B Detection

Solar Energy ◽  
2002 ◽  
Author(s):  
Nicola Rohner ◽  
Andreas Neumann
Keyword(s):  
Temperature Measurement ◽  
Temperature Measurements ◽  
Solar Furnace ◽  
Correct Selection ◽  
Basic Material ◽  
Atmospheric Conditions ◽  
Spectral Measurements ◽  
System Temperature ◽  
Selection Of

The correct selection of the operating wavelength is essential for a precise pyrometric temperature measurement on solar irradiated samples, as the measurement may be disturbed by reflected solar radiation. Atmospheric conditions and particularly the emissivity as basic material property determine the amount of this reflected and the emitted radiation from a sample under investigation. An approach to solve this problem by using a monochromator system for temperature measurement in the UV-B range was developed and experimentally tested. With this system, temperature measurements were possible beginning at 1320°C and ranging up to about 2400°C. Two calculation methods are described and compared. The influence of the calibration temperature on the quality of the temperature measurement is shown. Measurements on a blackbody up to 1500°C were performed for calibration purpose. Temperature measurements on a real solar heated magnesia sample up to 2400°C are presented and discussed. These spectral measurements on hot bodies irradiated in the DLR Solar Furnace led to the final specification of the measurement wavelengths to be in the range from 280 nm to 293 nm.

Elements and Materials Improve the FDM Products: A Review

2016 ◽  
Vol 16 ◽  
pp. 33-51 ◽  
Author(s):  
Abduladim Salem Bala ◽  
Saidin bin Wahab ◽  
Mazatusziha binti Ahmad
Keyword(s):  
Matrix Material ◽  
Process Parameter ◽  
Correct Selection ◽  
Complex Environment ◽  
Technology Process ◽  
The Matrix ◽  
Additive Materials ◽  
Insight Into ◽  
Selection Of

This work aims to provide a review of available published literature that explores the opportunities to improve the quality of fused deposit modelling (FDM) products, particularly in medical applications. The paper presents details concerning the basis of the technology, process parameter settings and their responses, and reviews the properties of common FDM engineering/bio-materials and the available methods applied for improving their performance. Based on the researches which have been reviewed, FDM technology works within a complex environment from process parameters. Thus, it can achieve good results only with the proper settings for these parameters according to the properties of the material used. Improving the polymers is essentially based on the correct selection of additive materials, which can particularly enhance the key property/properties in the matrix material. This review provides a brief insight into FDM technology, provides an idea of the process parameter settings, the available materials and ways of modifying their properties to consequently improve the quality of FDM products.

The Gambler's Ruin Problem, Genetic Algorithms, and the Sizing of Populations

1999 ◽  
Vol 7 (3) ◽  
pp. 231-253 ◽  
Author(s):  
George Harik ◽  
Erick Cantú-Paz ◽  
David E. Goldberg ◽  
Brad L. Miller
Keyword(s):  
Genetic Algorithms ◽  
Building Blocks ◽  
Correct Selection ◽  
Problem Size ◽  
One Dimensional ◽  
Fitness Evaluation ◽  
Gambler’S Ruin ◽  
Gambler's Ruin Problem ◽  
Selection Of

This paper presents a model to predict the convergence quality of genetic algorithms based on the size of the population. The model is based on an analogy between selection in GAs and one-dimensional random walks. Using the solution to a classic random walk problem—the gambler's ruin—the model naturally incorporates previous knowledge about the initial supply of building blocks (BBs) and correct selection of the best BB over its competitors. The result is an equation that relates the size of the population with the desired quality of the solution, as well as the problem size and difficulty. The accuracy of the model is verified with experiments using additively decomposable functions of varying difficulty. The paper demonstrates how to adjust the model to account for noise present in the fitness evaluation and for different tournament sizes.

scholarly journals Predicting Tomato Seedling Morphology by X-ray Analysis of Seeds

1994 ◽  
Vol 119 (2) ◽  
pp. 258-263 ◽  
Author(s):  
W.J. van der Burg ◽  
J.W. Aartse ◽  
R.A van Zwol ◽  
H. Jalink ◽  
R.J. Bino
Keyword(s):  
Free Space ◽  
Evaluation Procedure ◽  
Germination Test ◽  
High Quality ◽  
Seedling Morphology ◽  
Tomato Seedling ◽  
X Ray ◽  
Size And Morphology ◽  
Selection Of

Studies based on X-ray photographs were conducted to predict the morphology of tomato (Lycopersicon esculentum Mill.) seedlings at transplanting stage. Currently, seed-lot quality of tomato seeds for growing commercial transplants is determined with grow-out tests in the greenhouse because the standard germination test fails to predict the percentage of normal or usable transplants (UTs). These grow-out tests, however, are difficult to standardize. An X-ray evaluation procedure is presented as an alternative. X-ray images nondestructively provide information on embryo size and morphology and the amount of endosperm and the area of free space. These parameters correlate well with the morphology of 14-day old seedlings. Cotyledon morphology has the highest correlation with the percentage of UTs. A test based on the evaluation of X-ray images, classifying the cotyledon morphology and seed free space, predicts the percentage of UTs more accurately than the currently used germination test. A second method based on an equation that uses the probabilities of all X-ray categories proportionally predicts the percentage of UTs of primed seeds more accurately than the first method. Selecting individual seeds based on X-ray images has the potential to raise the percentage of UTs of seed lots. On the average, the percentage of UTs of control seeds was 22% higher after hand selection based on X-ray evaluation. Primed seeds gave 12% higher results. Hence, X-ray analysis can predict seedling performance and enable the selection of high-quality seeds.

Typical errors when performing intraoral periapical x-rays, and their effect on image quality

2020 ◽  
pp. 36-44
Author(s):  
A.P. Arzhantsev
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Digital Image ◽  
Cone Beam ◽  
X Rays ◽  
Post Processing ◽  
X Ray ◽  
Selection Of ◽  
Periapical Radiography

During the study, intraoral periapical images were analyzed in 300 patients. The possibilities of using the methods of radiography and their influence on the quality of the obtained x-ray images were studied. The intraoral periapical radiography was compared with the results of orthopantomography and cone beam computed tomography. To identify the features of the mapping of zones of periapical destruction, 47 experimental x-ray studies were performed on skeletonized jaws with artificial defects in cortical plates. Often encountered errors are: an arbitrary choice of angles of inclination and the centration of the x-ray tube, the wrong location of the x-ray receiver in the patient's mouth, inaccurate installation or poor fixation of the patient's head, inefficient selection of physical and technical conditions of shooting, non-compliance with the conditions of the photo process with analog radiography or post-processing and printing digital image. The characteristic projection distortions of images resulting from these errors are analyzed and illustrated.

The method of estimation of influence the type of intersection into environmental conditions

2018 ◽  
Vol 121 ◽  
pp. 351-362
Author(s):  
Aleksander Sobota
Keyword(s):  
Quality Of Service ◽  
Transport System ◽  
Environmental Conditions ◽  
Decision Problem ◽  
Road Transport ◽  
Correct Selection ◽  
Basic Assumptions ◽  
Selection Of

Functioning of transport system is determine by the quality of service realized by infrastructure of different transport branches. In case of road transport, very important are intersections. These objects are usually a bottleneck in the network. Therefore, the correct selection of the intersection type is really important in the planning and projecting process of infrastructure. So, decision problem have to be solved by the projectors, who have an influence on these process. But the selection of the intersection type is also the multi-criteria problem. Therefore the answer on the question like, does the intersection type have an influence on environmental conditions, have been presented in the article. For this purpose, the basic assumptions of the method of selections the intersection type, and results of the measurements realized at four type of intersection located on multilane arteries, have been presented in the article.

scholarly journals Multiple Primary Advanced Metachronous Cancer of Abdominal Organs with Multifocal Obstructive Syndrome: a Clinical Case of Successful Complex Treatment

2020 ◽  
Vol 13 (4) ◽  
pp. 338-343
Author(s):  
Alexander N Redkin ◽  
Elena Yu Ustinova ◽  
Sergey Sergeevich Popov ◽  
Olga V Manukovskaya ◽  
Juliya S Konoplina ◽  
...  
Keyword(s):  
Bile Ducts ◽  
Scar Tissue ◽  
Metachronous Cancer ◽  
Neoplastic Processes ◽  
Abdominal Organs ◽  
Tumor Lesion ◽  
Multiple Primary ◽  
Tissue Changes ◽  
Oncological Practice

Impaired patency of the gastrointestinal and urinary tract, and bile ducts is one of the essential problems in oncological practice in patients with tumors of various localizations. Stenoses are one of the most severe complications of the course of tumor diseases.Obstruction is a polyetiological condition that can result from a primary tumor lesion and specific neoplastic processes of nearby organs and structures. Sometimes narrowing of the lumen of organs and ducts can occur as a result of reactive scar tissue changes along the periphery of tumors. In some cases stenosis manifests itself as a complication of certain stages of treatment (surgical, radiation).The development of stenoses of the large intestine, the pylorus, the bile and urinary tracts significantly reduces the quality of life of patients due to the increasing obstruction of the above structures. Elimination of this syndrome is the main aim of treatment, regardless of the presence of tumor or non-tumor complications that have arisen.

scholarly journals WEIGHTED ICP POINT CLOUDS REGISTRATION BY SEGMENTATION BASED ON EIGENFEATURES CLUSTERING

2020 ◽  
Vol XLIII-B2-2020 ◽  
pp. 217-226
Author(s):  
M. Franzini ◽  
A. M. Manzino ◽  
V. Casella
Keyword(s):  
Point Clouds ◽  
Correct Selection ◽  
City Block ◽  
Flat Terrain ◽  
Dense Point ◽  
Aerial Vehicle ◽  
Single Block ◽  
Weighted Icp ◽  
Selection Of

Abstract. Dense point clouds can be nowadays considered the main product of UAV (Unmanned Aerial Vehicle) photogrammetric processing and clouds registration is still a key aspect in case of blocks acquired apart. In the paper some overlapping datasets, acquired with a multispectral Parrot Sequoia camera above some rice fields, are analysed in a single block approach. Since the sensors is equipped with a navigation-grade sensor, the georeferencing information is affected by large errors and the so obtained dense point clouds are significantly far apart: to register them the Iterative Closes Point (ICP) technique is applied. ICP convergence is fundamentally based on the correct selection of the points to be coupled, and the paper proposes an innovative procedure in which a double density points subset is selected in relation to terrain characteristics. This approach reduces the complexity of the calculation and avoids that flat terrain parts, where most of the original points, are de-facto overweighed. Starting from the original dense cloud, eigenfeatures are extracted for each point and clustering is then performed to group them in two classes connected to terrain geometry, flat terrain or not; two metrics are adopted and compared for k-means clustering, Euclidean and City Block. Segmentation results are evaluated visually and by comparison with manually performed classification; ICP are then performed and the quality of registration is assessed too. The presented results show how the proposed procedure seem capable to register clouds even far apart with a good overall accuracy.

scholarly journals SCLEROSING CHOLANGITIS IN CHILDREN AND ADOLESCENTS: CURRENT STATE OF THE PROBLEM

2019 ◽  
Vol 21 (5) ◽  
pp. 312-318 ◽  
Author(s):  
Galina V. Volynets ◽  
A. I. Khavkin ◽  
T. A. Skvortsova ◽  
V. V. Matkash ◽  
A. V. Nikitin
Keyword(s):  
Inflammatory Bowel Disease ◽  
Sclerosing Cholangitis ◽  
Bile Ducts ◽  
Immunosuppressive Treatment ◽  
Fecal Calprotectin ◽  
Unknown Etiology ◽  
Current State ◽  
Modern Methods ◽  
Extrahepatic Bile Ducts ◽  
Inflammatory Bowel

There are presented generalized data on modern methods of diagnosis and treatment of sclerosing cholangitis (SCh), a chronic inflammatory liver disease of unknown etiology affecting the intrahepatic and/or extrahepatic bile ducts resulting in cirrhosis of the liver. In children, 2 forms of SCh are distinguished: primary (PSCh) and autoimmune (ASCh). Diagnosis of SCh requires performing cholangiography. ACh responds to standard immunosuppressive treatment with prednisone/prednisone and azathioprine. Supportive immunosuppressive therapy should last at least 2-3 years. After the end of such treatment, the doctor should continue to monitor changes in the ratios of AST/ALT/IgG autoantibodies in the blood of patients every 3-month for at least 5 years. SCh is often associated with inflammatory bowel disease, which should be excluded in the debut by determining the content of fecal calprotectin and colonoscopy data. In children, liver transplantation is one of the options for the treatment of Ch. However, the frequency of relapses after transplantation remains high, especially in ACh patients.

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