scholarly journals Forensic veterinary evaluation of gunshot wounds to a dog’s head based on traditional examination methods and modern imaging techniques

2020 ◽  
Vol 76 (03) ◽  
pp. 6357-2020
Author(s):  
KINGA PANASIUK-FLAK ◽  
MAŁGORZATA GRELA ◽  
PIOTR LISTOS ◽  
MAGDALENA GRYZIŃSKA ◽  
GRZEGORZ BUSZEWICZ ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Kinetic Energy ◽  
Imaging Techniques ◽  
Gunshot Wounds ◽  
Test Material ◽  
Imaging Methods ◽  
X Ray ◽  
Modern Imaging ◽  
Examination Methods ◽  
Tomography Scan

At present, the most common method of analysis of gunshot wounds is necropsy, but modern imaging methods, such as X-ray (RTG) and computed tomography (CT), are gaining in popularity. We conducted an experiment involving shooting at test material from various distances (0 m, 1.5 m, 15 m) with bullets of various calibres in order to obtain characteristic gunshot wounds and compare the utility of the traditional autopsy method and modern imaging methods for forensic veterinary purposes. Then, a digital X-ray and computed tomography scan as well as a necropsy, were performed. The analysis of the results of the experiment with ammunition of different calibres showed that damage caused by a shot from a firearm is correlated with the calibre, initial velocity and kinetic energy of the projectile, as well as the distance from the barrel end to the object being shot. In the 12 cases analysed, 80% of the bullets fired from different distances had sufficient kinetic energy to exit the test material after passing through the tissue. A macroscopic necropsy supplemented by modern imaging methods is the most accurate means of forensic veterinary analysis of gunshot wounds in animals.

scholarly journals The clicking chest: what exactly did Hamman hear? A case report of a left-sided pneumothorax

2020 ◽  
Author(s):  
Nadeem Jimidar ◽  
Patrick Lauwers ◽  
Emmanuela Govaerts ◽  
Marc Claeys
Keyword(s):  
Computed Tomography ◽  
Differential Diagnosis ◽  
Case Report ◽  
Case Reports ◽  
Gunshot Wounds ◽  
Computed Tomography Scan ◽  
Imaging Studies ◽  
Left Chest ◽  
Case Summary ◽  
Tomography Scan

Abstract Background Hamman’s sign is a rare phenomenon. Louis Hamman described this pathognomonic clicking chest noise in association with pneumomediastinum in 1937. This typical noise can also be present in left-sided pneumothorax. Clinical cases already mention this pericardial knock in 1918 in gunshot wounds of the left chest and in 1928 in cases of spontaneous left-sided pneumothorax. However, the sound itself has only rarely been recorded. Case summary We describe a case of a young man with no significant medical history who was referred to the hospital with chest pain and audible clicks, documented with his smartphone. Imaging studies including chest radiograph and computed tomography scan revealed a left-sided pneumothorax. The patient underwent semi-urgent insertion of a thorax drain. His clinical outcome was excellent. Discussion In recent years only a few case reports describe Hamman’s sign, as it is rare and happens only transiently. This case report includes the audible clicks recorded by the patient with his smartphone. We stress the importance of thoracic clicking sounds as key symptom in the differential diagnosis of left-sided pneumothorax, pneumomediastinum, and valvular pathology such as mitral valve prolapse.

scholarly journals Optimization of the energy for Breast monochromatic absorption X-ray Computed Tomography

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Pasquale Delogu ◽  
Vittorio Di Trapani ◽  
Luca Brombal ◽  
Giovanni Mettivier ◽  
Angelo Taibi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Imaging Techniques ◽  
Fixed Dose ◽  
X Rays ◽  
Reconstruction Algorithms ◽  
Contrast Resolution ◽  
X Ray ◽  
X Ray Imaging ◽  
X Ray Computed ◽  
Dose Levels

Abstract The limits of mammography have led to an increasing interest on possible alternatives such as the breast Computed Tomography (bCT). The common goal of all X-ray imaging techniques is to achieve the optimal contrast resolution, measured through the Contrast to Noise Ratio (CNR), while minimizing the radiological risks, quantified by the dose. Both dose and CNR depend on the energy and the intensity of the X-rays employed for the specific imaging technique. Some attempts to determine an optimal energy for bCT have suggested the range 22 keV–34 keV, some others instead suggested the range 50 keV–60 keV depending on the parameters considered in the study. Recent experimental works, based on the use of monochromatic radiation and breast specimens, show that energies around 32 keV give better image quality respect to setups based on higher energies. In this paper we report a systematic study aiming at defining the range of energies that maximizes the CNR at fixed dose in bCT. The study evaluates several compositions and diameters of the breast and includes various reconstruction algorithms as well as different dose levels. The results show that a good compromise between CNR and dose is obtained using energies around 28 keV.

scholarly journals K-edge Subtraction Computed Tomography with a Compact Synchrotron X-ray Source

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Stephanie Kulpe ◽  
Martin Dierolf ◽  
Benedikt Günther ◽  
Madleen Busse ◽  
Klaus Achterhold ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contrast Agent ◽  
Imaging Techniques ◽  
X Rays ◽  
Synchrotron Source ◽  
X Ray ◽  
Inverse Compton Scattering ◽  
Inverse Compton ◽  
X Ray Computed ◽  
Compact Light Source

Abstract In clinical diagnosis, X-ray computed tomography (CT) is one of the most important imaging techniques. Yet, this method lacks the ability to differentiate similarly absorbing substances like commonly used iodine contrast agent and calcium which is typically seen in calcifications, kidney stones and bones. K-edge subtraction (KES) imaging can help distinguish these materials by subtracting two CT scans recorded at different X-ray energies. So far, this method mostly relies on monochromatic X-rays produced at large synchrotron facilities. Here, we present the first proof-of-principle experiment of a filter-based KES CT method performed at a compact synchrotron X-ray source based on inverse-Compton scattering, the Munich Compact Light Source (MuCLS). It is shown that iodine contrast agent and calcium can be clearly separated to provide CT volumes only showing one of the two materials. These results demonstrate that KES CT at a compact synchrotron source can become an important tool in pre-clinical research.

scholarly journals Classification among Image Enhancement Techniques for Computed Tomography scan by using CancerNet neural network

2021 ◽  
Vol 12 (3) ◽  
pp. 4938-4941
Author(s):  
SatyasangramSahoo Et. al.
Keyword(s):  
Neural Network ◽  
Computed Tomography ◽  
Medical Imaging ◽  
Network Structure ◽  
Medical Image ◽  
Computed Tomography Imaging ◽  
X Ray ◽  
Tomography Imaging ◽  
Neural Network Structure ◽  
Tomography Scan

Enhancement of cancerous images is a vital section of image preprocessing for Computed Tomography imaging classification. The combination of computer added pictures in X-ray is widely used for medical imaging. Basic enhancement techniques like Pixel wise Enhancements and Local operator based operation on computed Tomography (C.T.) scan are mainly used in preprocessing by using an artificially based model of the medical imaging. The study is focused on selecting the better among basic enhancement methods by using the cancerNet neural network structure. Whereas CancerNet is a widely used Convolutional neural Network structure for classification based study for cancerous medical image.

scholarly journals A Survey on Artificial Intelligence in Chest Imaging of COVID-19

2020 ◽  
Vol 1 (3) ◽  
pp. 137-146
Author(s):  
Yun Chen ◽  
Gongfa Jiang ◽  
Yue Li ◽  
Yutao Tang ◽  
Yanfang Xu ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Computed Tomography ◽  
Imaging Techniques ◽  
Chest Imaging ◽  
Imaging Analysis ◽  
X Ray ◽  
The Past ◽  
Analysis Methods ◽  
Improve Accuracy ◽  
Assisted Diagnosis

Abstract The coronavirus disease 2019 (COVID-19) has infected more than 9.3 million people and has caused over 0.47 million deaths worldwide as of June 24, 2020. Chest imaging techniques including computed tomography and X-ray scans are indispensable tools in COVID-19 diagnosis and its management. The strong infectiousness of this disease brings a huge burden for radiologists. In order to overcome the difficulty and improve accuracy of the diagnosis, artificial intelligence (AI)-based imaging analysis methods are explored. This survey focuses on the development of chest imaging analysis methods based on AI for COVID-19 in the past few months. Specially, we first recall imaging analysis methods of two typical viral pneumonias, which can provide a reference for studying the disease on chest images. We further describe the development of AI-assisted diagnosis and assessment for the disease, and find that AI techniques have great advantage in this application.

scholarly journals Current Imaging Trends in COVID-19 Pneumonia

2020 ◽  
Vol 58 (226) ◽  
Author(s):  
Anamika Jha ◽  
Benu Lohani ◽  
Ram Kumar Ghimire
Keyword(s):  
Computed Tomography ◽  
Health Care ◽  
Disease Transmission ◽  
Medical Council ◽  
X Ray ◽  
System Functioning ◽  
Chest X Ray ◽  
Polymerase Chain ◽  
Tomography Scan

COVID-19 has rapidly emerged as a pandemic threatening lives and healthcare systems worldwide.With the emergence of the disease in Nepal, all faculties of medicine need to be well prepared toface the challenge. Fortunately, now plenty of research is available to facilitate our preparednessin the war against COVID-19. The reverse transcriptase-polymerase chain reaction is the currentgold standard diagnostic test and chest Computed Tomography scan for screening the disease isconsidered inappropriate by most society recommendations. The Nepal Radiologists’ Associationhas proposed its guidelines which have been endorsed by the Nepal Medical Council. This articleaims to summarize the role of imaging focusing on chest X-ray and Computed Tomography scanincluding the indications, specific findings, and important differentials. Imaging needs to be donetaking necessary precautions, to minimize disease transmission, protect health care personnel, andpreserve health care system functioning.

scholarly journals Identifying the chaîne opératoire of prehistoric clay figurines using experimental archeology and imaging methods

2018 ◽  
Vol 48 ◽  
pp. 1860107 ◽  
Author(s):  
Theodor Ignat ◽  
Roxana Bugoi ◽  
Florin Constantin ◽  
Valentin Parnic ◽  
Cătălin Lazăr
Keyword(s):  
Imaging Techniques ◽  
Experimental Archaeology ◽  
Imaging Methods ◽  
X Ray ◽  
Chaîne Opératoire ◽  
Chaine Operatoire ◽  
X Ray Imaging ◽  
Subsequent Step ◽  
Manufacturing Techniques ◽  
Experimental Archeology

This paper reports the use of experimental archaeology and imaging methods—X-ray computed tomography (CT) and radiography—that were employed to decipher the manufacturing techniques of Eneolithic clay artefacts. This study was triggered by the archaeological research conducted in some tell settlements in Southeastern Romania that belong to the Kodjadermen-Gumelniţa-Karanovo VI culture (c. 4500–3900 BC). The findings reported here represent the first accounts of a recently started research project, which has as its main goal the re-creation of Eneolithic clay artefacts and the identification of the chaîne opératoire used for manufacturing these objects. In particular, X-ray imaging techniques were used as complementary methods to help understand the structure of intact Eneolithic artefacts. In a subsequent step of this research, these techniques will be employed to check for similarities between the archaeological items and modern pottery replicas created in experimental archaeology workshops.

scholarly journals In vivo imaging techniques for bone tissue engineering

2019 ◽  
Vol 10 ◽  
pp. 204173141985458 ◽  
Author(s):  
Eirini A Fragogeorgi ◽  
Maritina Rouchota ◽  
Maria Georgiou ◽  
Marisela Velez ◽  
Penelope Bouziotis ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Imaging Techniques ◽  
Photon Emission ◽  
Bone Defects ◽  
Emission Computed Tomography ◽  
Histological Techniques ◽  
Imaging Methods

Bone is a dynamic tissue that constantly undergoes modeling and remodeling. Bone tissue engineering relying on the development of novel implant scaffolds for the treatment of pre-clinical bone defects has been extensively evaluated by histological techniques. The study of bone remodeling, that takes place over several weeks, is limited by the requirement of a large number of animals and time-consuming and labor-intensive procedures. X-ray-based imaging methods that can non-invasively detect the newly formed bone tissue have therefore been extensively applied in pre-clinical research and in clinical practice. The use of other imaging techniques at a pre-clinical level that act as supportive tools is convenient. This review mainly focuses on nuclear imaging methods (single photon emission computed tomography and positron emission tomography), either alone or used in combination with computed tomography. It addresses their application to small animal models with bone defects, both untreated and filled with substitute materials, to boost the knowledge on bone regenerative processes.

scholarly journals Modern approaches and possibilities for assessing bone mineral density by quantitative computed tomography (literature review)

2021 ◽  
Vol 23 (4) ◽  
pp. 372-381
Author(s):  
Aleksandr A. Melnikov ◽  
◽  
Viktor V. Diachenko ◽  
Igor V. Shubin ◽  
Aleksei E. Nikitin ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Bone Mineral Density ◽  
Bone Mineral ◽  
Imaging Techniques ◽  
Quantitative Computed Tomography ◽  
Dual Energy ◽  
Mineral Density ◽  
Diagnosis Of Osteoporosis ◽  
X Ray ◽  
Clinically Significant

The review provides the literature data on the basal issues of bone remodeling and the applied use of medical imaging techniques for the prevention of clinically significant consequences of osteoporosis. The article discusses the role and prospects of using the method of quantitative computed tomography and its modifications for the diagnosis of osteoporosis and osteopenic syndrome. It considers the advantages of quantitative computed tomography over widely used medical techniques for assessing bone mineral density (mono- and dual-energy X-ray absorptiometry, mono- and dual-energy isotope absorptiometry).

scholarly journals X-ray and computed tomography scan-based morphometric analysis of skull baselines in Indian population

2019 ◽  
Vol 14 (4) ◽  
pp. 1116
Author(s):  
JigarRajesh Desai ◽  
NandanAmrit Marathe ◽  
AdityaA Dahapute ◽  
KiranP Dhole ◽  
Shubhanshu Bhaladhare ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Morphometric Analysis ◽  
Indian Population ◽  
Computed Tomography Scan ◽  
X Ray ◽  
Tomography Scan
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