Temat: imaging - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The influence of the transducer bandwidth and double pulse transmission on the encoded imaging ultrasound
Autorzy:: Trots, I.
Nowicki, A.
Lewandowski, M.
Secomski, W.
Litniewski, J.
Tematy:: encoded imaging ultrasound
ultrasound imaging transducer
CGS; Pokaż więcej
Data publikacji:: 2008
Powiązania:: https://bibliotekanauki.pl/articles/331651.pdf Link otwiera się w nowym oknie
Źródło:: Hydroacoustics; 2008, 11; 419-430
1642-1817
Pojawia się w:: Hydroacoustics
Opis:: An influence effect of fractional bandwidth of ultrasound imaging transducer on the gain of compressed echo signal being the complementary Golay sequences (CGS) with different spectral widths is studied in this paper. Also, a new composing transmission method of CGS is discussed together with compression technique applied in order to increase the signal-to-noise ratio (SNR) and penetration. The CGS with two different bit lengths, one-cycle and two-cycles are investigated. Two transducers with fractional bandwidth of 25% and 80% at centre frequency 6 MHz are used. The experimental results are presented, clearly proofing that increasing of the code length leads to compressed echo amplitude enhancement. The smaller the bandwidth is the larger is this effect; the pulse-echo sensitivity of the echo amplitude increases by 1.88 for 25% fractional bandwidth and 1.47 for 80% while preserving time resolution. The presented results of double transmission of short codes show the penetration and SNR improvement while maintaining dead zone.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Observation of intrapulse energy switching in standing-wave electron linac
Autorzy:: Matusiak, Michał
Kosiński, Tymoteusz
Wronka, Sławomir
Zakrzewski, Tomasz
Tematy:: cargo scanning
dual-energy imaging
X-ray imaging; Pokaż więcej
Data publikacji:: 2022
Powiązania:: https://bibliotekanauki.pl/articles/2173383.pdf Link otwiera się w nowym oknie
Źródło:: Nukleonika; 2022, 67, 3; 43--47
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Opis:: For the development of an effective cargo-scanning system, an intrapulse energy switching has been tested at the National Centre for Nuclear Research (NCBJ) with the possibility to change the beam energy within a 4 μs pulse of the linear electron accelerator (linac). Modifi cation of the electron energy is achieved through the beam-loading effect in a standing-wave accelerating structure equipped with a triode gun. Construction of the machine and the achieved results are presented in this article.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Hyperspectral imaging - a short review of methods and applications
Autorzy:: Kowalewski, Jędrzej
Domaradzki, Jarosław
Zięba, Michał
Podgórski, Mikołaj
Tematy:: hyperspectral imaging
spectral imaging
observation methods
infrared detector; Pokaż więcej
Data publikacji:: 2023
Powiązania:: https://bibliotekanauki.pl/articles/58973645.pdf Link otwiera się w nowym oknie
Źródło:: Metrology and Measurement Systems; 2023, 30, 4; 637-654
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Opis:: This paper takes a look at the state-of-the-art solutions in the field of spectral imaging systems by way of application examples. It is based on a comparison of currently used systems and the challenges they face, especially in the field of high-altitude imaging and satellite imaging, are discussed. Based on our own experience, an example of hyperspectral data processing is presented. The article also discusses how modern algorithms can help in understanding the data that such images can provide.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Fusion of Depth and Thermal Imaging for People Detection
Autorzy:: Gutfeter, Weronika
Pacut, Andrzej
Tematy:: depth imaging
person detection
sensor fusion
thermal imaging; Pokaż więcej
Data publikacji:: 2021
Powiązania:: https://bibliotekanauki.pl/articles/2058486.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Telecommunications and Information Technology; 2021, 4; 53--60
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Opis:: The methodology presented in this paper covers the topic of automatic detection of humans based on two types of images that do not rely on the visible light spectrum, namely on thermal and depth images. Various scenarios are considered with the use of deep neural networks being extensions of Faster R-CNN models. Apart from detecting people, independently, with the use of depth and thermal images, we proposed two data fusion methods. The first approach is the early fusion method with a 2-channel compound input. As it turned out, its performance surpassed that of all other methods tested. However, this approach requires that the model be trained on a dataset containing both types of spatially and temporally synchronized imaging sources. If such a training environment cannot be setup or if the specified dataset is not sufficiently large, we recommend the late fusion scenario, i.e. the other approach explored in this paper. Late fusion models can be trained with single-source data. We introduce the dual-NMS method for fusing the depth and thermal imaging approaches, as its results are better than those achieved by the common NMS.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Factors Influencing Accuracy of Estimating Position of Objects in a Multi-camera System
Autorzy:: Klimaszewski, Krzysztof
Grajek, Tomasz
Wegner, Krzysztof
Tematy:: 3D imaging
measurement accuracy
optical imaging
stereovision; Pokaż więcej
Data publikacji:: 2024
Powiązania:: https://bibliotekanauki.pl/articles/58906717.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Telecommunications and Information Technology; 2024, 2; 1-16
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Opis:: Nowadays, research focusing on robotics, autonomous vehicles, and scene analysis shows a clear need for the ability to accurately reconstruct three-dimensional environments. One of the methods allowing to conduct such a reconstruction is to use a set of cameras and image processing techniques. This is a passive method. Despite being, in general, less accurate than its active counterparts, it offers significant advantages in numerous applications in which active systems cannot be deployed due to limited performance. This paper provides a theoretical analysis of the accuracy of estimating 3D positions of objects present at a given scene, based on images from a set of cameras. The analysis assumes a known geometrical configuration of the camera system. The important limiting factor in the considered scenario is the physical resolution of sensors - especially in the case of systems that are supposed to work in real time, with a high FPS rate, as the use of high-resolution cameras is difficult in such circumstances. In the paper, the influence of the geometric arrangement of the cameras is studied and important conclusions about the potential of three-camera configurations are drawn. The analysis performed and the formulas derived help predict the boundary accuracy values of any system using a digital camera. The results of an experiment that confirm the theoretical conclusions are presented as well.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Przydatność termowizji do diagnostyki technicznej urządzeń energomechanicznych w zakładach górniczych
Usefulness of thermal imaging for a technical diagnostics of energy-mechanical devices in mines
Autorzy:: Malicki, W.
Miedziński, B.
Tematy:: termowizja
termowizja w górnictwie
mining thermal imaging
thermal imaging; Pokaż więcej
Data publikacji:: 2009
Powiązania:: https://bibliotekanauki.pl/articles/186059.pdf Link otwiera się w nowym oknie
Źródło:: Mechanizacja i Automatyzacja Górnictwa; 2009, R. 47, nr 7, 7; 34-38
0208-7448
Pojawia się w:: Mechanizacja i Automatyzacja Górnictwa
Opis:: W artykule omówiono zarówno przydatność jak i podano możliwości wykorzystania termowizji do diagnostyki technicznej urządzeń energomechanicznych w zakładach górniczych. Wykazano, że prawidłowo opracowana analiza wykonanych zdjęć termowizyjnych daje szereg cennych informacji o stanie technicznym pracującego urządzenia. Pozwoli to na podjęcie, w szeregu przypadkach i w odpowiednim czasie, istotnych decyzji zapobiegających potencjalnym awariom.
There have been discussed both a usefulness and a usability of thermal imaging for a technical diagnostics of energy-mechanical devices in mines. It has been proven that a correctly prepared analysis of thermal images gives a number of valuable information on a technical state of operation of a device. This may allow the crucial decisions to be taken in many cases and in a proper time which would prevent possible failures.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Pomiary CTDI100w dla systemu XVI (Elekta) według normy IEC 60601-2-44-A1 (2012)
Measurements of CTDI for the XVI system (Elekta) in accordance to IEC 60601-2-44-A1 (2012)
Autorzy:: Oborska-Kumaszyńska, Dominika
Fazlic, Semir
Liu, Julian
Tematy:: obrazowanie CBCT
CTDI
dawki obrazowania
CBCT imaging
imaging dose; Pokaż więcej
Data publikacji:: 2020
Powiązania:: https://bibliotekanauki.pl/articles/2146757.pdf Link otwiera się w nowym oknie
Źródło:: Inżynier i Fizyk Medyczny; 2020, 9, 2; 125--132
2300-1410
Pojawia się w:: Inżynier i Fizyk Medyczny
Opis:: System kV-CBCT zintegrowany z akceleratorem dostarcza danych obrazowych do weryfikacji pozycjonowania pacjenta oraz określania międzyfrakcyjnego i śródfrakcyjnego ruchu narządów (w szczególności ważne dla obszarów targetowych i organów ryzyka). Zintegrowanie systemu obrazowania, używającego energie kilowoltowe, miało na celu przede wszystkim zapewnienie dobrego kontrastu dla różnicowania tkanek miękkich. Chociaż dawka promieniowania podczas kV-CBCT jest relatywnie niska, to, co powoduje, że należy ją zidentyfikować co do wartości, jest jej wielokrotne użycie podczas codziennej weryfikacji pozycji pacjenta podczas leczenia radioterapeutycznego. Średnia dawka współtowarzysząca w regionie graniczącym z wiązką terapeutyczną podczas przebiegu RT przy codziennym stosowaniu CBCT (zakładając łącznie 40 skanów) może mieścić się w zakresie 1-2 Gy, przy maksymalnych dawkach w zakresie 3-7 Gy. Przy takich poziomach dawek słuszne wydaje się właściwe zarządzanie tymi dawkami przez przeprowadzenie procesu optymalizacji, który zakłada wypracowanie kompromisu pomiędzy dostarczoną dawką a jakością obrazowania. Wykonanie pomiarów dawek pozwala na ocenę dawek współtowarzyszących sesjom radioterapeutycznym oraz zarządzanie procesami obrazowania z punktu widzenia tej kontrybucji w obszarach leczonych, jak również w organach ryzyka i tkankach zdrowych. W ramach oceny dawek dla systemu XVI (Elekta) zostały wykonane pomiary CTDI 100 zgodnie z metodologią standardu IEC 60601-2-44-A1 (2012), który przewiduje pomiary dla warunków wiązki stożkowej.
A kV-CBCT system, integrated with an accelerator, provides image data for verifying patient positioning and determining inter-fraction and intra-fraction movement of organs (it is particularly important for targets and OARs). An integration of an imaging system using kV energy was primarily aimed at providing a good contrast for soft tissue differentiation. Although, a kV-CBCT radiation dose is relatively low, importance of the dose assessment based on a fact the kV-CBCT imaging can be used for a daily verification of a patient’s position during RT. The average accompanying dose during RT with daily use CBCT (assuming a total of 40 scans) can be 1-2 Gy, with maximum doses 3-7 Gy. It seems appropriate to properly manage these doses by performing an optimization process that assumes a compromise between the dose delivered and the quality of imaging. Dose measurements allow the assessment of doses accompanying RT. The dose assessment has been done for the XVI (Elekta) system by CTDI100 measurements which were performed in accordance with the methodology of the IEC 60601-2-44-A1 (2012) for cone beam conditions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Functional MRI – how does it work?
Autorzy:: Truszkiewicz, Adrian
Aebisher, David
Przypek, Aneta
Guz, Wiesław
Bartusik-Aebisher, Dorota
Tematy:: deoxyhemoglobin
oxyhemoglobin
Magnetic Resonance Imaging functional Magnetic Resonance Imaging; Pokaż więcej
Data publikacji:: 2017
Powiązania:: https://bibliotekanauki.pl/articles/454947.pdf Link otwiera się w nowym oknie
Źródło:: European Journal of Clinical and Experimental Medicine; 2017, 2; 120-126
2544-2406
2544-1361
Pojawia się w:: European Journal of Clinical and Experimental Medicine
Opis:: Magnetic Nuclear Resonance (MRI) is a non-invasive tissue imaging method. This technique is based on the influence of a strong magnetic field and electromagnetic wave of strictly defined frequency on the nucleus of elements with non-zero spin. The study describes one of the variants of functional MRI, (fMRI), which has become a key technique in brain imaging. This technique has excellent spatial and temporal resolution and involves a changing signal intensity depending on the degree of oxygenation of the blood. Blood oxygenation levels are known to vary in accordance with neural activity and these differences can be used to detect brain activity. This is due to increased demand for energy and oxygen in the area of increased neural activity. The basis of this imaging is the so-called Blood Oxygenation-Level Dependent (BLOD) effect. The aim of this paper is to present the scope of fMRI as a diagnostic method in neurology and in neurosurgery. This paper presents the principles of fMRI, methods of application, research result development, and suggests areas of possible medical applications. The limitations of fMRI as a clinical tool in medical applications will also be addressed. Studies presented in this paper are based on clinical fMRI experience and a literature review.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Procesowa kontrola danych informatycznych w chmurze obliczeniowej
Autorzy:: Nowikowska, Monika
Tematy:: cloud computing
physical imaging
logical imaging
search
securing evidence; Pokaż więcej
Data publikacji:: 2023-02-20
Powiązania:: https://bibliotekanauki.pl/articles/13948496.pdf Link otwiera się w nowym oknie
Źródło:: Cybersecurity and Law; 2023, 9, 1; 167-183
2658-1493
Pojawia się w:: Cybersecurity and Law
Opis:: The article attempts to analyze the process control of correspondence stored in virtual memory, i.e. in the so-called Cloud Computing. The study is an attempt to answer the question of how mobile devices and clouds are examined and what impact the law on privacy has on the implementation of procedural activities. The growing interest in cloud computing results in the emergence of many new legal problems, which translate into, among others, on the practice and operation of law enforcement agencies. First, the concept of „cloud computing” was discussed and the provisions on obtaining electronic evidence were analyzed. The independence of ICT systems from the functioning of a classic work environment based on a single workstation also allowed us to raise the question of the cross-border nature of services provided in the cloud. IT data transmitted via cloud computing can be saved on several devices located in different countries.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Legal Possibilities of Using AI in Medicine, with Particular Emphasis on Imaging Diagnostics and Responsibility of Medical Entities – Polish Perspective
Autorzy:: Król-Całkowska, Justyna
Walczak, Daniel
Tematy:: artificial intelligence
deep learning
machine learning
medical imaging
diagnostic imaging; Pokaż więcej
Data publikacji:: 2021
Powiązania:: https://bibliotekanauki.pl/articles/55991969.pdf Link otwiera się w nowym oknie
Źródło:: Teka Komisji Prawniczej PAN Oddział w Lublinie; 2021, 14, 1; 205-218
1899-7694
2719-7379
Pojawia się w:: Teka Komisji Prawniczej PAN Oddział w Lublinie
Opis:: The method/practise of providing healthcare services has been significantly modified due to the development of the pandemic. In everyday medical practice, the use of telecommunication media has begun to be widely used, which enable the provision of healthcare services at a distance. The next step is the use of artificial intelligence during the planning, implementation and control of medical activities, which will support and even replace humans at various stages of medical activities. The article discusses issues related to the use of artificial intelligence in the process of medical activities, referring the above to the perspective of current legal regulations. Considering the nature of civilization diseases, the paper refers to the use of AI on the basis of imaging diagnostics constituting the basis for cancer diagnosis and therapy. The choice of this broad topic was motivated by the indications of the latest literature, which emphasize that malignant tumor is the most common cause of death in developed countries and it is estimated that the number of cases will continue to increase in aging populations. The article is one of the first attempts to analyze the principles of using AI in medicine and the principles of its liability for potential damage. The authors used the method of analyzing the applicable regulations, including regulations under European law, and also made a synthetic analysis of the position of the judicature and doctrine. The article indicates that the liability for damage caused by AI should be identified with liability for a dangerous product. At the same time, the civil liability of the medical entity for damages resulting from the use of AI in the diagnostic imaging process will be subject to the general regime of tort liability.
Dostawca treści:: Biblioteka Nauki

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