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Tytuł:
Contrast induced acute kidney injury – is it a real problem these days?
Autorzy:
Musiałowski, P.
Musiałowska, D.
Gościk, E.
Małyszko, J.
Powiązania:
https://bibliotekanauki.pl/articles/1917818.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
contrast media
contrast induced nephropathy
acute kidney injury
Opis:
Acute kidney injury (AKI) is proven risk factor associated with higher mortality and morbidity among hospitalized patients. The widespread use contrast media opens the discussion about the acute kidney injury as a result of used contrast - contrast induced nephropathy (CIN). CIN is defined as an acute, generally reversible decline in renal function that occurs 48-72 hours after intravascular injection of contrast medium. Pre-existing renal insufficiency is characterised independent risk factor for occurrence of CI-AKI, other factors,such as diabetes mellitus, hypertension, advanced age or hemodynamic instability increase the risk of AKI, but are not characterized as independent risk factors. Published new large retrospective single-center studies presented equal risk of AKI among patients receiving contrast enhanced computer tomography if compared to unenhanced computer tomography, based on serum creatinine levels. In our review we would like to present a persisting the problem of CIN after intravenous (iv) as well intra-arterial contrast media administration
Źródło:
Progress in Health Sciences; 2016, 6(1); 177-182
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency of cropping system designs via base contrast
Autorzy:
Bronowicka-Mielniczuk, U.
Mielniczuk, J.
Przybysz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1208129.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
cropping system experiment
inter-contrast
efficiency factor
base contrast
Opis:
The present article is a continuation of previous papers by the same authors devoted to the efficiency of crop rotation experiments. We focus on plans distinguished by the cyclical pattern of the incidence matrix. For practical reasons, we slightly modify the efficiency coefficient. The relation between the resulting efficiency coefficients is examined. In addition, we provide a background material on crop rotation experiments.
Źródło:
Applicationes Mathematicae; 2000, 27, 4; 377-384
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Yellow-Tinted Lenses on Visual Attributes Related to Sports Activities and Daily Life in Late Middle-aged Adults
Autorzy:
Kohmura, Yoshimitsu
Murakami, Shigeki
Someya, Yuki
Aoki, Kazuhiro
Powiązania:
https://bibliotekanauki.pl/articles/1055076.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
contrast sensitivity
dynamic visual acuity
hand–eye coordination
low-contrast visual acuity
sports
Opis:
The purpose of this study was to clarify the effects of colored lenses on the visual performance of middle-aged people. The subjects were 19 middle-aged people with a mean age of 57.4 ±6.0 years. Five different functional lenses were used in the experiments: colorless lenses and four colored lenses (Light-yellow, Dark-yellow, Light-gray, and Dark-gray). Using each lens type, contrast sensitivity, depth perception, hand–eye coordination, dynamic visual acuity, and visual acuity/low-contrast visual acuity were measured. Visual acuity/low-contrast visual acuity was measured under the four conditions of Evening, Evening + Glare, Day, and Day + Glare. Results showed that dynamic visual acuity and depth perception did not differ among the lens types, but hand–eye coordination measurements had a significantly shorter time with the Light-yellow and Dark-yellow lenses than the Dark-gray lenses. Low-contrast visual acuity under Evening and Evening + Glare conditions tended to be lower with the Dark lenses than the Colorless and Light-yellow lenses. The subjects rated the Yellow lenses as bright in a subjective questionnaire evaluation.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2015, 9, 1; 27-36
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A statistical criterion to establish normal ranges for age in a contrast sensitivity function test
Autorzy:
Santillán, J E
Issolio, L A
Colombo, E M
Powiązania:
https://bibliotekanauki.pl/articles/173959.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
contrast sensitivity
ophthalmological clinic
normality references
Opis:
In a previous work (Opt. Appl. 39(2), 2009, pp. 415–428) we established the characteristics that a computer-based contrast sensitivity function (CSF) measurement system has to be used in the opthalmological clinic. In order to obtain a generalized use of CSF in clinics and as a screening tool, the necessity to incorporate a normality range by age was also suggested. It will also be important to establish how many reference curves are necessary, because in the last decades, different ranges have been presented in the literature. In the present work, our purpose was to show how to distribute the observers in terms of the statistical variations of CSF as a function of age in a normal population of healthy eyes. We then evaluated the utility of these curves in the detection of vision problems and, finally, the possibility of using them as a screening tool considering a reduced number of spatial frequencies. We used a computer-based CSF measurement system to present sinusoidal gratings whose values range from 1 to 24 cycles per degree. Three different groups (control, clinical and non-clinical) of subjects were considered. From the statistical analysis we obtained two ranges of normality, based on significant differences that appear around the age of 50. As we were interested in evaluating if this separation could increase the sensitivity of the test, we also performed a series of measurements in a clinical environment. As an interesting possibility of usage of a vision test is screening, we also measured people in conditions relatively different to those found in laboratories or clinics. We observed that this division into two ranges allows a better discrimination, especially for young adults. Measurements show an improvement of 22% in the detection of vision anomalies.
Źródło:
Optica Applicata; 2014, 44, 2; 213-225
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Do they understand more? Turkish EFL speakers perception of sentence stress in English
Autorzy:
Buczek-Zawiła, Anita
Powiązania:
https://bibliotekanauki.pl/articles/1040190.pdf
Data publikacji:
2016-12-30
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
sentence stress
discrimination
phonetic training
focus
contrast
Opis:
As one of the most prominent elements of intonation sentence stress frequently contributes to the meaning expressed by speakers. It most typically signals details of an utterance information structure, but it also performs a contrastive or emphasizing function, thus expressing focus in the spoken discourse. In English and many other languages its location, while exhibiting certain regularities it additionally determined by extra relevant or relative information. As such, either alone or in combination, it may communicate certain additional shades of meaning that, similarly to the contribution of sentence intonation, may escape the attention of EFL speakers. The paper explores the comprehension sensitivity of Turkish speakers of English when it comes to identifying meaning details contributed by sentence stress. It investigates their awareness as detected through perception of variable sentence stress location. The target group are Turkish advanced speakers of English, with various levels of competence, and only sporadic phonetic training in English for part of them. In a perception-based experiment they were asked to identify the details they perceive. Their results were then compared and analysed, also in relation to what their native language (with a distinction into sentential and focal stress) adds in terms of this module of utterance intonation. Finally, their results were correlated with those achieved by Polish advanced speakers of English as investigated in a similar study conducted earlier. The interpretation of the results reveals that Turkish EFL speakers are more sensitive to the highlighting or contrastive function of sentence stress, achieving overall better result here than when they are to judge its contribution to notion such as politeness or impatience. They are also rather competent at detecting the prominent element in an utterance.
Źródło:
Linguistics Beyond and Within; 2016, 2; 27-43
2450-5188
Pojawia się w:
Linguistics Beyond and Within
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Are traditional methods of balancing accommodation still useful in the modern optometry office? A comparison of methods
Autorzy:
Pempera, P
Feltzke, M
Miskowiak, B
Powiązania:
https://bibliotekanauki.pl/articles/173744.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
binocular balance
Turville infinity balance
Humphriss immediate contrast
Opis:
The goal of this research is to compare the usefulness of both Turville infinity balance (TIB) and Humphriss immediate contrast (HIC) as methods of balancing accommodation. Statistical analysis of test results and practical application of both tests were taken into account. A group of 50 people between 18 to 72 years of age were examined. Balancing the state of accommodation of each eye by the two aforementioned methods was performed after refractive examination and full correction of refractive errors. The examination was carried out by the use of phoropter and optotypes on the LCD monitor. Bland–Altman plots were used as a method of statistical analysis. Calculations were made by the use of the programs Excel 2000 and MedCalc. Three variables d, T and H were defined as the differences in spherical lens powers, right and left eye respectively, after monocular refraction (d ), after the balance of accommodation by the TIB test (T ) and after the balance of accommodation by HIC test (H ). The mean difference between TIB and HIC methods for the same individuals was +0.05 (95% limits of agreement: from –0.40 to +0.51 D), the mean difference between the refraction monocular (d ) and the TIB method (T ) was +0.01 D (95% limits of agreement: –0.48 to +0.50 D), the mean difference between monocular refraction (d ) and HIC method (H ) was 0.07 D (95% limits of agreement: from –0.56 to +0.69 D). Comparison of the selected methods of balancing accommodation shows that for patients, in whom it can be used, the Turville infinity balance test is a superior method to the Humphriss immediate contrast test.
Źródło:
Optica Applicata; 2014, 44, 1; 79-91
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring of the Basic Parameters of LCD Displays
Autorzy:
Barczyk, R.
Kabzinski, B.
Jasinska-Choromanska, D.
Stienss, A.
Powiązania:
https://bibliotekanauki.pl/articles/384703.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
LCD
parameter
contrast ratio
view angle
luminance
measurement
Opis:
This article is about realization of the laboratory stand used for measuring parameters of LCD displays. The stand together with additional accessories (spectrophotometer and measuring probes) as well as software allow to measure a wide range of parameters (colour gamut, response time, contrast coefficient and its irregularity, luminance of black colour and its irregularity, luminance of white colour and its irregularity, changes of luminance depending on the viewing angle). This paper also show method and results of measurements of differences in contrast ratio and luminance uniformity between particular pieces of the same model of a display screen (research has been carried out on 5 pieces of the same model of a display). The presented results show that the measured value of the viewing angle may significantly differ from the value provided by producers of displays.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 46-48
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and evaluation of novel mri contrast agents of chemically modified GD-DTPA complexes with sugars
Autorzy:
Sugiyama, M.
Yamashita, M.
Yu, G.
Fujie, M.
Ogawa, K.
Ozaki, N.
Aoki, T.
Mizuno, S.
Okada, S.
Tachi, K.
Aoshima, K.
Sankar, U. R.
Kumar, B. S.
Takehara, Y.
Sakahara, H.
Powiązania:
https://bibliotekanauki.pl/articles/385252.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
MRI contrast agent
Gd(III)-DTPA
tumor imaging
Opis:
MRI is one of medical diagnostic imaging technologies that can draw the cross section in the body. To obtain a clearer image, Gd complexes are often used as MRI contrast agents. Gd-DTPA (Gd-Diethylenetriaminepentaacetate, Magnevist registered trademark ) is used in particular as the MRI contrast agents. We prepared and evaluated novel MRI contrast agents that were chemically modified Gd-DTPA with sugars (represented as Gd-DTPA-Sugar) via hydrolysis route for providing specificity to target organs and tissues. Gd-DTPASugar complex showed an excellent potential for the MRI contrast agent (r1=31.2 s-1mM-1). Gd-DTPA-Sugar complexes alternatively prepared by shorter synthetic route without protection/ deprotection (hydrolysis) method showed inferior results (r1=6.3 and 8.1 s-1mM-1) to the hydlized product.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 191-194
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A unified terminology in block designs
Autorzy:
Caliński, Tadeusz
Kageyama, Sanpei
Powiązania:
https://bibliotekanauki.pl/articles/729764.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
block design
PEB design
efficiency factor
basic contrast
Opis:
Partially efficiency balanced (PEB) designs with m efficiency classes have been defined by Puri and Nigam [15] as block designs which have simple analysis and, if properly used, allow the important contrasts to be estimated with desired efficiency. Such designs can be made available in varying replications and/or unequal block sizes. However, any block design is a PEB design with m efficiency classes for some m < v, where v is the number of treatments in the design. So the term "PEB" itself is not much informative in a statistical sense. More information may be added to this term. In this paper, a unified terminology is suggested, aimed at giving more statistical meaning to the PEB designs, which may or may not be connected. The paper is essentially based on our recent books "BLOCK DESIGNS: A Randomization Approach", Springer Lecture Notes in Statistics, Vol. 150 (2000), Vol. 170 (2003), with some new additions.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2004, 24, 1; 127-145
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of absorption and scattering on the velocity of acoustic streaming
Autorzy:
Secomski, W.
Wójcik, J.
Klimonda, Z.
Olszewski, R.
Nowicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/332699.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
ultrasound
radiation force
starch
contrast agent
blood
thrombolysis
Opis:
Streaming velocity depends on intensity and absorption of ultrasound in the media. In some cases, such as ultrasound scattered on blood cells at high frequencies, or the presence of ultrasound contrast agents, scattering affects the streaming speed. The velocities of acoustic streaming in a blood-mimicking starch suspension in water and Bracco BR14 contrast agent were measured. The source of the streaming was a plane 20MHz ultrasonic transducer. Velocity was estimated from the averaged Doppler spectrum. The single particle driving force was calculated as the integral of the momentum density tensor components. For different starch concentrations, the streaming velocity increased from 8.9 to 12.5mm/s. This corresponds to a constant 14% velocity increase for a 1 g/l increase in starch concentration. For BR14, the streaming velocity remained constant at 7.2mm/s and was independent of the microbubbles concentration. The velocity was less than in reference, within 0.5mm/s measurement error. Theoretical calculations showed a 16% increase in streaming velocity for 1 g/l starch concentration rise, very similar to the experimental results. The theory has also shown the ability to reduce the streaming velocity by low-density scatterers, as was experimentally proved using the BR14 contrast agent.
Źródło:
Hydroacoustics; 2017, 20; 159-168
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Primary spleen lymphoma visualized with contrast enhanced ultrasound - case report
Autorzy:
Kurzepa, Joanna
Uhlig, Sebastian
Czekajska-Chehab, Elżbieta
Siek, Elżbieta
Zakościelna, Magdalena
Drop, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/972546.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
contrast enhanced ultrasonography
CEUS
Primary splenic lymphoma
PSL
Opis:
Introduction. The case is reported of an extremely rare primary splenic lymphoma (PSL) and summarizes the basic concepts and techniques of contrast enhanced ultrasonography (CEUS), focusing on splenic applications for the diagnosis of malignant splenic lesions. Case report. A 52-year-old male with no co-morbidities presented with a history of left upper abdominal pain for one month, and chronic fatigue. Abdominal ultrasound was performed in which suspicious focal lesions in the enlarged spleen was detected, and assessed with contrast enhanced ultrasound, followed by magnetic resonance imaging (MRI). The diagnosis of malignant splenic tumour was made based on history, clinical examinations and radiographic appearance in CEUS and MRI. Conclusion. In the presented case contrast enhanced ultrasound allowed establishing the diagnosis of malignancy within the spleen, which was later confirmed with MRI and histopathological examination.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2017, 11, 2; 157-159
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contrast enhancement of scanning electron microscopy images using a noncomplex multiphase algorithm
Autorzy:
Alsaygh, Zaid
Al-Ameen, Zohair
Powiązania:
https://bibliotekanauki.pl/articles/2097436.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
image enhancement
SEM images
statistical approaches
contrast enhancement
Opis:
Microscopic technology has recently flourished, allowing unparalleled viewing of microscopic elements invisible to the normal eye. Still, the existence of unavoidable constraints led on many occasions to have low contrast scanning electron microscopic (SEM) images. Thus, a noncomplex multiphase (NM) algorithm is proposed in this study to provide better contrast for various SEM images. The developed algorithm contains the following stages: first, the intensities of the degraded image are modified using a two-step regularization procedure. Next, a gamma-corrected cumulative distribution function of the logarithmic uniform distribution approach is applied for contrast enhancement. Finally, an automated histogram expansion technique is used to redistribute the pixels of the image properly. The NM algorithm is applied to natural-contrast distorted SEM images, as well as its results are compared with six algorithms with different processing notions. To assess the quality of images, three modern metrics are utilized, in that each metric measures the quality based on unique aspects. Extensive appraisals revealed the adequate processing abilities of the NM algorithm, as it can process many images suitably and its performances outperformed many available contrast enhancement algorithms in different aspects.
Źródło:
Applied Computer Science; 2022, 18, 2; 28--42
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of effect of computer tomography with intravenous contrast administration on renal excretory function
Ocena wpływu badania tomograficznego z dożylnym podaniem kontrastu na czynność wydalniczą nerek
Autorzy:
Pietrzak, Mikołaj
Cieślar, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1036521.pdf
Data publikacji:
2016
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
computer tomography
radio-contrast
renal excretory function
contrast-induced nephropathy
tomografia komputerowa
kontrast radiologiczny
markery czynności wydalniczej nerek
nefropatia pokontrastowa
Opis:
INTRODUCTION: Despite the described risk of contrast-induced nephropathy, defined as sudden (up-to 48–72 h) deterioration of renal function after the administration of contrast, guidelines for border level renal excretory function markers securing safe contrast CT have not been established. The aim of study was to assess the effect of CT with intravenous contrast on changes of renal excretory function markers. MATERIALS AND METHODS: In a prospective study, 60 patients who had CT with intravenous contrast were analyzed. Before CT and after 48 hours, the level of markers of renal function: creatinine, urea and potassium were marked in the patients’ serum and the eGFR value was calculated. The patients were divided into 2 groups, depending on the output value of creatinine and eGFR: group 1 – normal values and group 2 – slightly elevated ones by 20%. RESULTS: The average concentration of creatinine before CT did not differ significantly from the values after contrast application (1.05 ± 0.23 vs. 1.03 ± 0.26 mg/dl). The average value of eGFR before contrast CT did not differ significantly from the value after contrast application (71.53 ± 18.86 vs. 74.25 ± 22.50 ml/min./1.73 m2). No significant changes in urea and potassium concentrations after radio-contrast application were observed. The values of the analyzed markers did not differ significantly compared to the baseline values in any group, nor did sex or type of CT have an effect on the marker levels. CONCLUSIONS: The intravenous administration of contrast during CT does not cause significant changes in renal excretory function markers, either in patients with normal renal function or in patients with baseline values elevated by 20%, irrespective of sex or type of CT.
WSTĘP: Pomimo opisywanego ryzyka wystąpienia nefropatii kontrastowej definiowanej jako nagłe (do 48–72 h) pogorszenie funkcji nerek po podaniu kontrastu dotychczas nie ustalono wytycznych odnośnie do granicznego poziomu markerów czynności wydalniczej nerek, dla których dopuszczalne jest wykonanie kontrastowego badania TK. Celem pracy była ocena wpływu dożylnego podania kontrastu podczas badań TK różnego typu na zmiany wartości markerów czynności wydalniczej nerek. MATERIAŁ I METODY: W prospektywnym badaniu analizowano 60 kolejnych pacjentów (25 kobiet i 35 mężczyzn), którym wykonano badanie TK z dożylnym podaniem kontrastu. W dniu badania oraz po 48 godzinach w surowicy pacjentów oznaczano stężenie markerów czynności nerek: kreatyniny, mocznika i potasu oraz obliczano współczynnik filtracji kłębuszkowej (eGFR). Pacjentów podzielono na 2 grupy zależnie od wyjściowych wartości badanych markerów: grupa 1 – wartości prawidłowe, grupa 2 – wartości przekraczające normę średnio o ok. 20%. WYNIKI: Średnie stężenie kreatyniny przed badaniem nie różniło się znamiennie od stężenia po badaniu (1,05 ± 0,23 vs. 1,03 ± 0,26 mg/dl). Średnia wartość eGFR przed badaniem nie różniła się znamiennie od wartości po badaniu (71,53 ± 18,86 vs. 74,25 ± 22,50 ml/min./1,73 m2). Nie stwierdzono również istotnych zmian stężenia mocznika i potasu po wykonaniu badania. Wartości badanych parametrów po wykonaniu badania TK nie różniły się znamiennie w stosunku do wartości wyjściowych w żadnej grupie chorych, nie były również zależne od płci i rodzaju badania TK. WNIOSKI: Dożylne podanie kontrastu w trakcie badania TK nie powoduje znamiennych zmian wartości markerów czynności wydalniczej nerek u pacjentów z prawidłową czynnością nerek oraz u pacjentów z wyjściowymi wartościami markerów przekraczającymi granicę normy o ok. 20%, bez względu na płeć i rodzaj wykonanego badania.
Źródło:
Annales Academiae Medicae Silesiensis; 2016, 70; 33-39
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D/4D contrast-enhanced urosonography (ceVUS) in children – is it superior to the 2D technique?
Sonocystografia 3D/4D u dzieci – czy wnosi więcej informacji niż badanie 2D?
Autorzy:
Woźniak, Magdalena Maria
Osemlak, Paweł
Ntoulia, Aikaterini
Borzęcka, Halina
Bieniaś, Beata
Brodzisz, Agnieszka
Jędrzejewski, Grzegorz
Drelich-Zbroja, Anna
Powerski, Maciej
Pech, Maciej
Wieczorek, Andrzej Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1033099.pdf
Data publikacji:
2018
Wydawca:
Medical Communications
Tematy:
children
contrast agents
ultrasound
urinary tract infections
vesicoureteral reflux
Opis:
Background: By now, two-dimensional contrast-enhanced voiding urosonography (ceVUS) has become a well-established method for the diagnosis and treatment monitoring of vesicoureteral reflux in children, particularly after the recent approval for this application in children in the USA and in Europe. The introduction of three-dimensional static (3D) and real-time (4D) techniques with ultrasound contrast agents opens up new diagnostic opportunities for this imaging modality. Objective: To analyze whether 3D and 4D ceVUS is a superior technique compared to standard 2D ceVUS in diagnosing vesicoureteral reflux in children. Material and methods: The study included 150 patients (mean age 3.7 years) who underwent 2D and 3D/4D ceVUS for the diagnosis and grading of vesicoureteral reflux. Results: 2D ceVUS and 3D/4D ceVUS diagnosed the same number of vesicoureteral refluxes, however, there was a statistically significant difference in grading between the two methods. Performing 3D/4D ceVUS resulted in changing the initial grade compared to 2D ceVUS in 19 out of 107 refluxing units (17.76%) diagnosed. The 4D technique enabled a more conspicuous visualization of vesicoureteral reflux than the 3D technique. Conclusions: 2D ceVUS and 3D/4D ceVUS diagnosed the same number of vesicoureteral refluxes, however, there was a statistically significant difference in grading between the two methods. Thus 3D/4D ceVUS appears at least a valid, if not even a more conspicuous technique compared to 2D ceVUS.
Wprowadzenie: Sonocystografia mikcyjna wykonywana techniką dwuwymiarową (2D) posiada ugruntowaną pozycję jako metoda diagnostyki i monitorowania leczenia odpływu pęcherzowo-moczowodowego u dzieci, szczególnie w kontekście uzyskanej niedawno rejestracji środka do stosowania w tym wskazaniu w USA i Europie. Wprowadzenie trójwymiarowych technik statycznych (3D) i dynamicznych (4D) z zastosowaniem ultrasonograficznych środków kontrastujących otwiera nowe możliwości diagnostyczne przed tą metodą obrazowania. Cel pracy: Celem pracy było określenie, czy sonocystografia mikcyjna 3D i 4D wnosi więcej informacji w porównaniu do standardowej sonocystografii mikcyjnej 2D w diagnostyce odpływu pęcherzowo-moczowodowego u dzieci. Materiał i metoda: Grupa badana obejmowała 150 pacjentów (średnia wieku 3,7 roku), którzy zostali poddani badaniu sonocystografii mikcyjnej 2D i 3D/4D w celu zdiagnozowania i oceny stopnia odpływu pęcherzowo-moczowodowego. Wyniki: Przy użyciu techniki 2D zdiagnozowano taką samą liczbę odpływów pęcherzowo-moczowodowych jak w badaniu 3D/4D. Istniała jednak statystycznie istotna różnica pomiędzy obiema metodami w aspekcie oceny stopnia odpływu. W 19 spośród 107 (17,76%) jednostek miedniczkowo-moczowodowych (JMM) ze zdiagnozowanym odpływem rozszerzenie badania o sonocystografię techniką 3D/4D skutkowało zmianą pierwotnego stopnia odpływu określonego na podstawie sonocystografii mikcyjnej 2D. Technika 4D umożliwiała uzyskanie obrazowania odpływu pęcherzowo-moczowodowego w sposób dokładniejszy niż technika 3D. Wnioski: Przy użyciu sonocystografii mikcyjnej 2D zdiagnozowano taką samą liczbę odpływów pęcherzowo-moczowodowych jak w przypadku techniki 3D/4D. Istniała jednak statystycznie istotna różnica pomiędzy obiema metodami w aspekcie oceny stopnia odpływu. Można zatem stwierdzić, iż sonocystografia mikcyjna 3D/4D to skuteczna technika diagnostyczna, która dodatkowo umożliwia bardziej dokładne w porównaniu z techniką 2D zobrazowanie odpływu, ułatwiając ocenę jego stopnia.
Źródło:
Journal of Ultrasonography; 2018, 18, 73; 120-125
2451-070X
Pojawia się w:
Journal of Ultrasonography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-level and Low-level Feature Set for Image Caption Generation with Optimized Convolutional Neural Network
Autorzy:
Padate, Roshni
Jain, Amit
Kalla, Mukesh
Sharma, Arvind
Powiązania:
https://bibliotekanauki.pl/articles/2174448.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
CNN
image caption
proposed contrast
sharpness
SMO-SCME algorithm
Opis:
Automatic creation of image descriptions, i.e. captioning of images, is an important topic in artificial intelligence (AI) that bridges the gap between computer vision (CV) and natural language processing (NLP). Currently, neural networks are becoming increasingly popular in captioning images and researchers are looking for more efficient models for CV and sequence-sequence systems. This study focuses on a new image caption generation model that is divided into two stages. Initially, low-level features, such as contrast, sharpness, color and their high-level counterparts, such as motion and facial impact score, are extracted. Then, an optimized convolutional neural network (CNN) is harnessed to generate the captions from images. To enhance the accuracy of the process, the weights of CNN are optimally tuned via spider monkey optimization with sine chaotic map evaluation (SMO-SCME). The development of the proposed method is evaluated with a diversity of metrics.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 4; 67--74
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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