An Independent Three-Dimensional (3D) Dose Verification System for Elekta Unity MR-Linac Online Plans

Abstract PurposeTo implement an independent 3D dose verification system with RayStation (RaySearch, Stockholm, Sweden) for online adaptive radiotherapy on Elekta Unity MR-Linac (MRL). MethodsPlan quality of simple-single-field and intensity-modulated radiotherapy (IMRT) plans were investigated in a comparison of (1) Monte-Carlo calculated data using MRL Monaco with high magnetic field (1.5 T) and (2) Collapsed-Cone calculated data using RayStation. The dose quality of RayStation plans, compared to corresponding Monaco plans, was (1) visually inspected in percentage depth-dose curves, inline and crossline profiles, and (2) quantified in 3D gamma-passing-rates. Processing time was measured to evaluate the practical efficacy of our system using 5 prostate IMRT plans.ResultsCompared to Monaco simple-single-field plans as ground truth, RayStation simple-single-field plans achieved an average 95.7% and 98.5% in 2%/2mm and 3%/3mm of 3D gamma criteria, respectively. Gantry angle dependency in simple-single-field plans was <2% in both 2%/2mm and 3%/3mm, and field size dependency was <5% in 2%/2mm and <2% in 3%/3mm. Compared to Monaco IMRT plans, RayStation IMRT plans achieved an average 95.1% (3%/3mm). The entire processing time of the independent 3D dose verification system was an average approximately 200 s. ConclusionsThis was the study to implement an independent 3D dose verification process using RayStation with an in-house 3D gamma analysis software. This led to an average 95% plan quality in 3%/3mm gamma criteria and added an average 200 s throughout the entire verification processes. These results demonstrate that this approach can be applicable and efficient for online quality assurance for MRL online adaptive radiotherapy planning.

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An automatic dose verification system for adaptive radiotherapy for helical tomotherapy

Journal of Physics Conference Series ◽

10.1088/1742-6596/489/1/012075 ◽

2014 ◽

Vol 489 ◽

pp. 012075

Author(s):

Xiaohu Mo ◽

Mingli Chen ◽

Donald Parnell ◽

Gustavo Olivera ◽

Daniel Galmarini ◽

...

Keyword(s):

Helical Tomotherapy ◽

Adaptive Radiotherapy ◽

Dose Verification ◽

Verification System ◽

Automatic Dose

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INFLUENCE OF FORCED CONVECTION IN LIQUID INSIDE THE TIN ON DURATION OF STERILIZATION IN THE COURSE OF FISH PROCESSING

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2017-1-137-144 ◽

2017 ◽

pp. 137-144

Author(s):

Gennadiy Valentinovich Alexeev ◽

Elena Igorevna Verboloz

Keyword(s):

High Temperature ◽

Liquid Phase ◽

Forced Convection ◽

Thermal Process ◽

Processing Time ◽

Fish Processing ◽

Study Results ◽

Equipment Modernization ◽

Bottom To Top

The article focuses on the process of intensive mixing of liquid phase in the tin during high-temperature sterilization, i.e. sterilization when temperature of the heat carrier reaches 150-160°C. It has been stated that for intensification of the thermal process during sterilization of tinned fish with liquid filling it is preferable to turn a tin from bottom to top. This operation helps to increase the driving power of the process and to shorten warming time. Besides, high-temperature sterilization carried out according to experimental modes, where the number of tin turnovers is calculated, greatly shortens processing time and improves quality of the product. In this case there is no superheating, all tins are evenly heated. The study results will contribute to equipment modernization and to preserving valuable food qualities.

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STUDY ON THE PROCESS OF RAPESEED HULLING BY THE IMPACT

Известия вузов. Пищевая технология ◽

10.26297/0579-3009.2019.2-3.19 ◽

2019 ◽

Author(s):

А.О. РЕНЗЯЕВ ◽

О.П. РЕНЗЯЕВ ◽

С.Н. КРАВЧЕНКО ◽

Р.В. КРЮК

Keyword(s):

Rotational Speed ◽

Calculated Data ◽

Quality Characteristics ◽

Complete Separation ◽

Edible Oil ◽

Siberian Region ◽

The Core ◽

The Cost ◽

The Impact

Исследованы прочностные и физико-механические свойства оболочки рапса с точки зрения ее разрушения и удаления. Установлено, что наиболее рациональным является двухстадийный способ обрушивания: 1-я стадия – на вальцовых мельницах, 2-я – на центробежной обрушивающей машине. Определены параметры центробежной обрушивающей машины для обеспечения минимальной необходимой линейной скорости 10,81 м/с: угол наклона отбойной пластины (90 ± 2)°, частота вращения барабана (2400 ± 150) об/мин. Установлено, что правильно подобранные условия и угол, под которым происходит удар, позволяют значительно снизить количество не до конца обрушенного семени и содержание расколотого ядра. При этом при свободном ударе об отбойную пластину под углом, отличным от 88–91°, или подаче недостаточно равномерного потока семян значительно увеличивается содержание необрушенных семян. На разрушение 1 кг семян необходимо затратить 58,45 Дж. Таким образом, по расчетным данным, для семян рапса диаметром 1,5 мм частота вращения барабана должна находиться в диапазоне от 2221 до 2565 об/мин при ударе семени под углом 90°. Диаметр семян рапса, выращиваемого в Сибирском регионе, составляет от 0,8 до 1,8 мм. Установлено, что подсушивание семян рапса в течение 30–40 с при температуре 100°С позволяет увеличить эффективность разрушения оболочки до полного ее отделения от ядра рапса. Представленные результаты позволяют повысить качество очистки семян рапса от оболочки и улучшить качественные характеристики получаемого масла, облегчить последующие технологические процессы получения пищевого масла, снизить затраты на рафинацию и дезодорацию на 2%. The strength and physico-mechanical properties of the shell of rapeseed in terms of its destruction and removal are investigated. It is established that the most rational is a two-stage method of seed hulling: the 1st stage – on roller mills, the 2nd – on a centrifugal hulling machine. The parameters of the centrifugal hulling machine to provide the minimum required linear speed of 10,81 m/s are defined: the angle of inclination of the turnback plate (90 ± 2)°, the rotational speed of drum (2400 ± 150) RPM. It is established that the correctly selected conditions and the angle at which the impact occurs, can significantly reduce the amount is not completely hulling seed and the substance of the split nucleus. At the same time, with a free impact on the turnback plate at an angle different from 88–91°, or the supply of an insufficiently uniform flow of seeds, the content is not completely hulling seed increases significantly. On hulling of 1 kg of seeds it is necessary to spend 58,45 J. Thus, according to the calculated data, for rape seeds with a diameter of 1,5 mm, the rotational speed of drum should be in the range from 2221 to 2565 RPM when the seed is struck at an angle of 90°. The diameter of rapeseed grown in the Siberian region ranges from 0,8 to 1,8 mm. It was found that drying of rapeseed for 30–40 s at a temperature of 100°C, can increase the efficiency of destruction of the shell to its complete separation from the core of rapeseed. The presented results make it possible to improve the quality of cleaning of rape seeds from the shell and improve the quality characteristics of the obtained oil, facilitate the subsequent technological processes of obtaining edible oil, reduce the cost of refining and deodorization by 2%.

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Ultrajet Mesodiagnostic Probabilistic Model for Surface Layer’s Variable Defectiveness of Complex Technology Products

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.882.289 ◽

2021 ◽

Vol 882 ◽

pp. 289-295

Author(s):

Andrey Leonidovich Galinovskiy ◽

Aleksandr Aleksandrovich Barzov ◽

Mary Alekseevna Prokhorova

Keyword(s):

Surface Layer ◽

Sufficient Conditions ◽

Calculated Data ◽

Hydrodynamic Effect ◽

Topographic Features ◽

Technology Products ◽

Complex Technology ◽

Materials Used ◽

Necessary And Sufficient

Technologically, ultrajet mesodiagnostics (UJM) consists of local hydroerosive indentation by ultrajets (UJ) of water on the surface of the analyzed object (OA) and the subsequent study of the results of this minimally invasive microdestructive effect on its surface layer. Obviously, mathematical models’ construction of the functional relationship between the informative-physical signs of hydroerosive UJ destruction and the surface layer’s state parameters of various OA, primarily their defectiveness, is very important for the development of this potentially promising technology for ensuring the quality of critical products, mainly aviation and other industries. In this regard, the work proposes a probabilistic UJM model, which consists of analyzing the kinetics of the formation of an aggregate set of eroded particles, as a process caused by a combination of appropriate necessary and sufficient conditions for its implementation. The former include the topographic features of the microdefectiveness’ characteristics of the surface layer material, and the latter consist of a certain variational-force hydrodynamic effect of the diagnostic UJ on it. This approach made it possible to obtain calculated data related to probabilistic distribution of the UJ-eroded particles’ sizes of hypothetical OA, as a coordinate function describing the microdefects’ concentration in its surface layer. These functions are close to the available results of experimental UJM of typical and promising materials used in the manufacture of machinery technology.

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Percentage depth dose fragmentation for investigating and assessing the photon beam dosimetry quality

Journal of Radiotherapy in Practice ◽

10.1017/s1460396918000687 ◽

2018 ◽

Vol 18 (03) ◽

pp. 280-284 ◽

Cited By ~ 4

Author(s):

Mohamed Bencheikh ◽

Abdelmajid Maghnouj ◽

Jaouad Tajmouati

Keyword(s):

Exponential Decay ◽

Target Volume ◽

Photon Beam ◽

Field Size ◽

Photon Beams ◽

Energy Agency ◽

Percentage Depth Dose ◽

Depth Dose ◽

Beam Dosimetry

AbstractAimThe purpose of this study is to introduce a new approach to assess the dosimetry quality of photon beam with energy and irradiation field size. This approach is based on percentage depth dose (PDD) fragmentation for investigating the dosimetry quality.Materials and methodsFor the investigation of the dosimetry quality of 6 and 18 MV photon beams, we have proceeded to fragment the PDD at different field sizes. This approach checks the overall PDD and is not restricted to the exponential decay regions, as per the International Atomic Energy Agency Technical Reports Series No 398 and the American Association of Physicist in Medicine Task Group 51 recommendations.Results and discussionThe 6 MV photon beam deposited more energy in the target volume than the 18 MV photon beam. The dose delivered by the 6 MV beam is greater by a factor of 1·5 than that delivered by the 18 MV beam in the build-up region and the dose delivered by the 6 MV beam is greater by a factor of 2·6 than that delivered by the 18 MV beam in the electronic equilibrium and the exponential decay regions.ConclusionThe dose measured at different points of the beam is higher for 6 MV than for 18 MV photon beam. Therefore, the 6 MV beam is more dosimetrically efficient than the 18 MV beam. Using the proposed approach, we can assess the dosimetry quality by taking into account overall PDD not only in the exponential decay region but also in the field.

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Facial Composite System Using Genetic Algorithm

Research Papers Faculty of Materials Science and Technology Slovak University of Technology ◽

10.2478/rput-2014-0007 ◽

2014 ◽

Vol 22 (341) ◽

pp. 47-51 ◽

Cited By ~ 1

Author(s):

Barbora Zahradníková ◽

Soňa Duchovičová ◽

Peter Schreiber

Keyword(s):

Processing Time ◽

Composite System ◽

Future Research ◽

Face Identification ◽

Time System ◽

Research Orientation ◽

System Requirements ◽

Composites Processing ◽

Facial Composite

Abstract The article deals with genetic algorithms and their application in face identification. The purpose of the research is to develop a free and open-source facial composite system using evolutionary algorithms, primarily processes of selection and breeding. The initial testing proved higher quality of the final composites and massive reduction in the composites processing time. System requirements were specified and future research orientation was proposed in order to improve the results.

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Effect of processing time on the quality of dry-cured ham obtained from a native pig breed (Chato Murciano)

Animal Production Science ◽

10.1071/an13284 ◽

2015 ◽

Vol 55 (1) ◽

pp. 113 ◽

Cited By ~ 6

Author(s):

Eva Salazar ◽

Adela Abellán ◽

José M. Cayuela ◽

Ángel Poto ◽

Francisco Girón ◽

...

Keyword(s):

Processing Time ◽

Consumer Preference ◽

Ripening Stage ◽

High Quality ◽

Processing Times ◽

Consumer Study ◽

Dry Cured Ham ◽

Sensory Changes ◽

Sensory Parameters

The compositional and sensory parameters of Chato Murciano dry-cured ham at different ripening times (14, 18, 22 and 24 months of processing) were studied. A sensory consumer study of dry-cured ham with a short ripening stage (14 months of processing) and a similar ham with a long ripening stage (22 months of processing) was carried out. Dry-cured hams remained in the ripening stage at 18−20°C and 70–75% relative humidity. The different processing times studied had no effect on the ash, intramuscular fat, sodium chloride and protein contents of the final ham, but significantly affected the moisture (P < 0.05) and saturated (P < 0.01) and monounsaturated (P < 0.05) fatty acid contents. Sensory analysis showed that processing time enhanced redness, fat colour, all of the odour and flavour traits studied, and all the texture traits except juiciness. In the taste profile, only saltiness showed a significant increase. However, sensory changes were only significant up to 22 months of processing (for most of the parameters), the resulting ham showing higher level of consumer preference and acceptability than dry-cured ham with the shorter ripening. Based on these results, it is recommended that an appropriate processing time to obtain a high-quality Chato Murciano dry-cured ham is 22 months.

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