scholarly journals Possibilities for obtaining the length-measured images of skeleton using modern X-rays equipment

2018 ◽  
Vol 25 (3-4) ◽  
pp. 89-94
Author(s):  
A. A Artemiev ◽  
A. Yu Silin ◽  
A. N Ivashkin ◽  
B. I Maximov ◽  
A. A Shipulin ◽  
...  
Keyword(s):  
X Rays ◽  
Special Equipment ◽  
High Quality ◽  
Teaching Activities ◽  
Medical Expertise ◽  
Special Knowledge ◽  
Data Documentation ◽  
Examination Process ◽  
Different Parts

Modern traumatology and orthopaedics is inconceivable without high-quality X-rays diagnostics. In the recent years special equipment that enables to obtain the length-measured images of different parts of a human body was introduced into clinical practice. The details of examination process, i.e. the position of a patient, position of an extremity and many others require special knowledge and experience. The aim of the study is to optimize the possibilities for obtaining the length-measured images of the different parts of a skeleton using modern X-rays equipment. The peculiarities of the determination of segments’ axes and length in patients with lower extremity deformities and shortening are presented; the most typical mistakes are analyzed. The results of the study are of great importance for medical expertise as well as for data documentation in practical, scientific and teaching activities.

scholarly journals HOMEMADE FIREARMS PRODUCED USING THE 3D PRINTING METHOD – THEIR CONSTRUCTION AND THE PECULIARITIES OF FORENSIC EXAMINATION

2020 ◽  
pp. 381-392
Author(s):  
P. Giverts
Keyword(s):  
3D Printing ◽  
New Technology ◽  
3D Printer ◽  
Wide Spread ◽  
Special Equipment ◽  
Forensic Examination ◽  
Special Knowledge ◽  
The Difference ◽  
Printing Method

The development of a new technology of material processing known as 3D printing in 2013 lead to posting on the Internet blueprints of the first pistol made with the use this technology. The pistol got the name Liberator. Within the first two days after the post, the blueprints of this pistol were downloaded more than a hundred thousand times. The difference of this construction from other constructions is that all the parts, except the firing pin, are printed on the 3D printer. For manufacturing this type of pistols special equipment (which has become easily available lately) is needed, as well as the knowledge and skill to operate it. At the same time, no special knowledge about the development and manufacturing of firearms is necessary. Availability of ready blueprints (the programs for printing the elements in 3D printer) without the need to do manual or machine treatment, lead to the wide spread of this type of homemade firearms. The law enforcements of many countries have already got cases of illegal trafficking of homemade firearms made with the use of 3D printing technology. The article discusses the construction features of Liberator pistol, as well as the peculiarities of its forensic examination. Special attention is paid to the problem of reliability and durability of this type of pistols. The possibility of damage or destruction of the pistol construction during a shot was investigated. The influence of different parameters, such as the size of the pistol, the material of its elements, the caliber of the cartridge on the possible destruction of the pistol, was also discussed. The damages in the pistols, made of different polymers, were illustrated in this article by the results of investigations taken from a few foreign professional sources. The problem of establishing the fact of a shot, which had been made from pistol printed in 3D printer, before the evidence came for forensic examination, was discussed. The article deals with the problem of the influence of this shot on the possibility of determination of the constriction durability and with the question if the evidence meets the criteria of firearms. Possible defects in the examined evidences, which should be checked be the examiners before the experimental shot, were pointed out.

Problems in Thin-Film X-ray Quantification

1990 ◽  
Vol 48 (2) ◽  
pp. 458-459
Author(s):  
J N Chapman ◽  
W A P Nicholson
Keyword(s):  
Thin Film ◽  
Specimen Thickness ◽  
X Rays ◽  
Characteristic Peak ◽  
Local Composition ◽  
X Ray ◽  
Measured Ratio ◽  
Path Lengths ◽  
Composition Changes

Energy dispersive x-ray microanalysis (EDX) is widely used for the quantitative determination of local composition in thin film specimens. Extraction of quantitative data is usually accomplished by relating the ratio of the number of atoms of two species A and B in the volume excited by the electron beam (nA/nB) to the corresponding ratio of detected characteristic photons (NA/NB) through the use of a k-factor. This leads to an expression of the form nA/nB = kAB NA/NB where kAB is a measure of the relative efficiency with which x-rays are generated and detected from the two species.Errors in thin film x-ray quantification can arise from uncertainties in both NA/NB and kAB. In addition to the inevitable statistical errors, particularly severe problems arise in accurately determining the former if (i) mass loss occurs during spectrum acquisition so that the composition changes as irradiation proceeds, (ii) the characteristic peak from one of the minority components of interest is overlapped by the much larger peak from a majority component, (iii) the measured ratio varies significantly with specimen thickness as a result of electron channeling, or (iv) varying absorption corrections are required due to photons generated at different points having to traverse different path lengths through specimens of irregular and unknown topography on their way to the detector.

Disability as a social phenomenon

2020 ◽  
pp. 22-38
Author(s):  
Natalia Guseva ◽  
Vitaliy Berdutin
Keyword(s):  
Social Protection ◽  
Russian Society ◽  
Stage Model ◽  
High Quality ◽  
Rehabilitation Programs ◽  
Current State ◽  
The Social ◽  
Consistent Solution ◽  
First Time

At present, the problem of establishing disability is a point at issue in Russia. Despite the fact that medical criteria for disability are being developed very actively, high-quality methods for assessing social hallmarks are still lacking. Since disability is a phenomenon inherent in any society, each state forms a social and economic policy for people with disabilities in accordance with its level of development, priorities and opportunities. We have proposed a three-stage model, which includes a system for the consistent solution of the main tasks aimed at studying the causes and consequences of the problems encountered today in the social protection of citizens with health problems. The article shows why the existing approaches to the determination of disability and rehabilitation programs do not correspond to the current state of Russian society and why a decrease in the rate of persons recognized as disabled for the first time does not indicate an improvement in the health of the population. The authors proposed a number of measures with a view to correcting the situation according to the results of the study.

Determination of Eleutherosides and β-Glucan Content from Different Parts and Cultivating Areas of A. senticosus and A. koreanum

2013 ◽  
Vol 42 (12) ◽  
pp. 2082-2087 ◽  
Author(s):  
Young-Hyun Kim ◽  
Da-Bin Bae ◽  
Jong Seok Lee ◽  
Sun-Ok Park ◽  
Sang-Jong Lee ◽  
...  
Keyword(s):  
Different Parts

scholarly journals POS1280 SPINAL LOCATION OF TUBERCULOSIS: WHAT HAS CHANGED OVER THE LAST YEARS?

2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 923.3-923
Author(s):  
S. Boussaid ◽  
M. Mrabet ◽  
S. Jemmali ◽  
H. Sahli ◽  
H. Ajlani ◽  
...  
Keyword(s):  
Neurological Complications ◽  
Developing Nations ◽  
Lumbar Pain ◽  
X Rays ◽  
Resonance Imaging ◽  
Vertebral Collapse ◽  
The Past ◽  
Significant Difference ◽  
Tuberculous Spondylodiscitis ◽  
Different Parts

Background:Tuberculosis (TB) is no longer a disease limited to developing nations and is still a major cause of significant morbidity and mortality worldwide. It can affect the different parts of the spine.Objectives:The aim of this study was to determine the preferred spinal location of TB.Methods:We conduct a retrospective and descriptive study in a single rheumatology department. Data were collected from observations of patients hospitalized in the past 20 years (2000-2020) who have been diagnosed with tuberculous spondylodiscitis (TS).Results:Fifty-two patients were included (37F/15M). Their mean age was 55.21 years ± 17.79 [19-91]. TS was more frequently unifocal (75%) than multifocal (25%). Lumbar spine involvement was the most common (57.7%) and more frequent in women (63.3%) but with no statistically significant difference (p = 0.2). Other localizations were described such as: dorso-lumbar (21.2%), dorsal (15.4%), lumbosacral (3.8%) and cervical (1.9%). Lumbar pain was present in 34 patients (65.4%) and 29 patients (55.8%) suffered from segmental lumbar stiffness. Imaging was contributive by showing the vertebral location using standard X-rays, computed tomography and magnetic resonance imaging. Disc pinch, erosion of vertebral plateaus and vertebral collapse were the major signs (82.7%, 65.4% and 67.3%, respectively).Conclusion:TS is a rare but serious clinical condition which may lead to severe deformity and early or late neurological complications. Spinal involvement is often unifocal and mostly diagnosed with lumbar pain or stiffness. Multifocal forms, touching several parts of the spine, however remain rare. Our findings remain consistent with those of the literature.Disclosure of Interests:None declared

scholarly journals Determination of the Vertical Dimension and the Position of the Occlusal Plane in a Removable Prosthesis Using Cephalometric Analysis and Golden Proportion

2021 ◽  
Vol 11 (15) ◽  
pp. 6948
Author(s):  
Gabriele Cervino ◽  
Sergio Sambataro ◽  
Chiara Stumpo ◽  
Salvatore Bocchieri ◽  
Fausto Murabito ◽  
...  
Keyword(s):  
Vertical Dimension ◽  
Occlusal Plane ◽  
X Rays ◽  
Common Procedure ◽  
Lower Incisor ◽  
Golden Proportion ◽  
The Face ◽  
Removable Prosthesis ◽  
Edentulous Patients

The aim of this study is to demonstrate the use and the effectiveness of cephalometry and golden proportions analysis of the face in planning prosthetic treatments in totally edentulous patients. In order to apply this method, latero-lateral and posterior-anterior X-rays must be performed in addition to the common procedure. Two main concerns for totally edentulous patients are the establishment of the vertical dimension and the new position of the occlusal plane. The divine proportion analysis was carried out by the use of a golden divider. The prosthetic protocol was divided into three steps and a case was selected for better understanding. Referring to the golden relations, if the distance from the chin to the wing of the nose is 1.0, the distance from the nose to eye is 0.618. This proportion is useful and effective in determining the correct prosthetic vertical dimension. The incisal margin of the lower incisor must be positioned between Point A (A) and protuberance menti (Pm) according to the gold ratio 0.618 of the total height A-Pm. Posteriorly the occlusal plane must be placed 2 mm below the divine occlusal plane (traced from the incisal margin of lower incisors to Xi point). A prosthesis made in accordance with cephalometric parameters and divine proportions of the face helps to improve the patient’s aesthetics, function and social personality.

scholarly journals Optimization of X-ray Investigations in Dentistry Using Optical Coherence Tomography

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4554
Author(s):  
Ralph-Alexandru Erdelyi ◽  
Virgil-Florin Duma ◽  
Cosmin Sinescu ◽  
George Mihai Dobre ◽  
Adrian Bradu ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Radiation Dose ◽  
Imaging Techniques ◽  
Image Resolution ◽  
Optical Coherence ◽  
X Rays ◽  
High Quality ◽  
X Ray

The most common imaging technique for dental diagnoses and treatment monitoring is X-ray imaging, which evolved from the first intraoral radiographs to high-quality three-dimensional (3D) Cone Beam Computed Tomography (CBCT). Other imaging techniques have shown potential, such as Optical Coherence Tomography (OCT). We have recently reported on the boundaries of these two types of techniques, regarding. the dental fields where each one is more appropriate or where they should be both used. The aim of the present study is to explore the unique capabilities of the OCT technique to optimize X-ray units imaging (i.e., in terms of image resolution, radiation dose, or contrast). Two types of commercially available and widely used X-ray units are considered. To adjust their parameters, a protocol is developed to employ OCT images of dental conditions that are documented on high (i.e., less than 10 μm) resolution OCT images (both B-scans/cross sections and 3D reconstructions) but are hardly identified on the 200 to 75 μm resolution panoramic or CBCT radiographs. The optimized calibration of the X-ray unit includes choosing appropriate values for the anode voltage and current intensity of the X-ray tube, as well as the patient’s positioning, in order to reach the highest possible X-rays resolution at a radiation dose that is safe for the patient. The optimization protocol is developed in vitro on OCT images of extracted teeth and is further applied in vivo for each type of dental investigation. Optimized radiographic results are compared with un-optimized previously performed radiographs. Also, we show that OCT can permit a rigorous comparison between two (types of) X-ray units. In conclusion, high-quality dental images are possible using low radiation doses if an optimized protocol, developed using OCT, is applied for each type of dental investigation. Also, there are situations when the X-ray technology has drawbacks for dental diagnosis or treatment assessment. In such situations, OCT proves capable to provide qualitative images.

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