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Journal articles on the topic 'Turbofan intake noise radiation'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Palma, Giorgio, Lorenzo Burghignoli, Francesco Centracchio, and Umberto Iemma. "Innovative Acoustic Treatments of Nacelle Intakes Based on Optimised Metamaterials." Aerospace 8, no. 10 (2021): 296. http://dx.doi.org/10.3390/aerospace8100296.

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Modern turbofans with high bypass ratios, low blade passage frequencies and short nacelles require continuous development of acoustic linings to achieve the noise reductions expected by the international aviation authorities. Metamaterials and metafluids have been recently proposed as promising technologies for designing innovative acoustic treatments dedicated to reducing aeronautic turbofan noise emissions. In this work, a phase-gradient metasurface treatment is investigated as a way to tackle the noise radiation from an axially symmetric nacelle. This paper aims to study the potential benef

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2

Guérin, S., and A. Holewa. "Fan tonal noise from aircraft aeroengines with short intake: A study at approach." International Journal of Aeroacoustics 17, no. 6-8 (2018): 600–623. http://dx.doi.org/10.1177/1475472x18789001.

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This work assesses the risks of increased fan noise for high bypass ratio aeroengines with short intakes. The close proximity between the fan and inlet contributes to the increase in radiation of the rotor-alone tones and reinforces the interaction of the inflow distortion with the fan. Thus, the closer the fan is to the inlet, the higher the risk for noise generation. This article discusses the results of Harmonic Balance simulations performed on a conceptual turbofan operated at the approach condition. The inflow distortion created by the nacelle incidence is dominated by the circumferential

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3

Groeneweg, J. F., and E. J. Rice. "Aircraft Turbofan Noise." Journal of Turbomachinery 109, no. 1 (1987): 130–41. http://dx.doi.org/10.1115/1.3262058.

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Recent advances in the understanding of turbofan noise generation and suppression in aircraft engines are reviewed with particular emphasis on NASA research. The review addresses each link in the chain of physical processes which connect unsteady flow interactions with fan blades to far field noise. Mechanism identification and description, duct propagation, radiation, and acoustic suppression are discussed. Recent advances in the experimental technique of fan inflow control assure that inflight generation mechanisms are not masked by extraneous sources in static tests. Rotor blade surface pre

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4

Özyörük, Y., E. Alpman, V. Ahuja, and L. N. Long. "Frequency-domain prediction of turbofan noise radiation." Journal of Sound and Vibration 270, no. 4-5 (2004): 933–50. http://dx.doi.org/10.1016/s0022-460x(03)00640-0.

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5

Korotin, P. I., O. A. Potapov, G. E. Fiks, I. S. Fiks, Ia S. Pochkin, and I. D. Khaletskii. "Active noise suppression in the model of turbofan intake duct." Aviation Engines, no. 2 (2021): 7–16. http://dx.doi.org/10.54349/26586061_2021_2_7.

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6

Polacsek, C., and S. Burguburu. "Fan Interaction Noise Predictions Using RANS-BEM Coupling." International Journal of Aeroacoustics 4, no. 1-2 (2005): 153–67. http://dx.doi.org/10.1260/1475472053729987.

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A source-to-far-field computation procedure aiming at predicting the noise generated by rotor-stator fan interactions and inlet noise radiation is presented here. It is applied to the NLR turbofan model, tested in DNW-LLF anechoic chamber under the framework of DUCAT project. The unsteady aerodynamic input for the acoustic computation is obtained using a 3D RANS code, CANARI, developed at ONERA for turbomachinery applications. The CFD solutions are coupled, using a modal expansion approach, to a BEM code, solving the Helmholtz equation in an arbitrary bounded space. A single interacting cut-on

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7

Rouvas, D.-M., and A. McAlpine. "Prediction of Fan Tone Radiation Scattered By A Cylindrical Fuselage." IOP Conference Series: Materials Science and Engineering 1226, no. 1 (2022): 012050. http://dx.doi.org/10.1088/1757-899x/1226/1/012050.

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Abstract A theoretical prediction method of the scattering of fan tone radiation from a turbofan inlet duct by the airframe fuselage is presented. The fan tone noise is modelled by an acoustic disc source that represents the sound field at the inlet duct termination. Adjacent to the source is a cylindrical fuselage that scatters the fan tone radiation. The prediction method is valid for upstream sound radiation. The acoustic pressure on the cylindrical fuselage is affected by refraction of the sound as it propagates through the fuselage boundary layer. This effect known as boundary layer shiel

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8

Parrett, A. V., and W. Eversman. "Wave envelope and finite element approximations for turbofan noise radiation in flight." AIAA Journal 24, no. 5 (1986): 753–60. http://dx.doi.org/10.2514/3.9342.

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9

Kholodov, Pavel, and Stéphane Moreau. "Identification of Noise Sources in a Realistic Turbofan Rotor Using Large Eddy Simulation." Acoustics 2, no. 3 (2020): 691–706. http://dx.doi.org/10.3390/acoustics2030037.

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Large Eddy Simulation is performed using the NASA Source Diagnostic Test turbofan at approach conditions (62% of the design speed). The simulation is performed in a periodic domain containing one fan blade (rotor-alone configuration). The aerodynamic and acoustic results are compared with experimental data. The dilatation field and the dynamic mode decomposition (DMD) are employed to reveal the noise sources around the rotor. The trailing-edge radiation is effective starting from 50% of span. The strongest DMD modes come from the tip region. Two major noise contributors are shown, the first be

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10

Duta, M. C., and M. B. Giles. "A three-dimensional hybrid finite element/spectral analysis of noise radiation from turbofan inlets." Journal of Sound and Vibration 296, no. 3 (2006): 623–42. http://dx.doi.org/10.1016/j.jsv.2006.03.006.

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11

Wang, Ruichen, and Xun Huang. "Sound radiation from semi-infinite elliptical ducts with uniform subsonic jets: An analytical approach." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A188—A189. http://dx.doi.org/10.1121/10.0023221.

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This paper presents an analytical method for modeling the acoustic field radiation from a semi-infinite elliptical duct with a uniform subsonic jet. Elliptical ducts are often used as inlets for turbofan engines to take full advantage of the pre-compression effect of the fuselage and improve the stealth performance of the aircraft. The method accounts for the instability wave inside the vortex sheet induced by the shearing of jet and ambient flow and its effect to sound radiation. The method uses Mathieu functions to describe the incident and scattered sound in the elliptic cylindrical coordin

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12

Dong, Thomas Z. "On Boundary Conditions for Acoustic Computations in Non-Uniform Mean Flows." Journal of Computational Acoustics 05, no. 03 (1997): 297–315. http://dx.doi.org/10.1142/s0218396x97000174.

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Many acoustic problems involve acoustic wave radiation to the exterior field. A common approach in numerical simulations is to restrict the computational domain to a finite region with artificial boundaries. The so-called radiation or non-reflecting boundary conditions must be imposed at those artificial boundaries. Most existing non-reflecting boundary conditions are derived for computing disturbances propagating in a known uniform mean flow near the boundaries. In many applications such as the computation of jet noise or turbofan noise, the mean flow at an artificial boundary is non-uniform

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13

Liu, Hongda, Dan Sun, Jingguo Sun, and Jianyuan He. "Numerical Analysis of Flow Field and Aerodynamic Noise in Intake Structure." Journal of Physics: Conference Series 2463, no. 1 (2023): 012052. http://dx.doi.org/10.1088/1742-6596/2463/1/012052.

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Abstract The CFD numerical simulation was used to simulate the flow field and sound field of the intake system, combined with the acoustic finite element method. Based on the Lighthill acoustic analogy and the Möhring acoustic analogy method, the internal sound source distribution of the intake system, the intensity of the nozzle noise and the acoustic directivity were analyzed. Improvement measures were proposed from the perspective of noise transmission, and the influence of different wall thicknesses on the wall stimulated radiation noise, as well as the effects of attaching sound absorbing

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14

Schade, Stephen, Roberto Merino-Martinez, Antoine Moreau, Susanne Bartels, and Robert Jaron. "Psychoacoustic evaluation of different fan designs for an urban air mobility vehicle with distributed propulsion system." Journal of the Acoustical Society of America 157, no. 3 (2025): 2150–67. https://doi.org/10.1121/10.0036228.

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Distributed propulsion systems are developed to power a new generation of aircraft. However, it is not known yet which noise emissions these propulsion systems produce, which psychoacoustic characteristics such systems exhibit, and how the generated noise is perceived. This paper investigates how fans with fewer stator than rotor blades affect the noise perception of a distributed propulsion system intended for an urban air mobility vehicle, which is equipped with 26 low-speed ducted fans. Three fan designs with different tonal to broadband noise ratio and opposite dominant noise radiation dir

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15

Qiu, S., WB Song, and H. Liu. "Shape optimization of a general bypass duct for tone noise reduction using continuous adjoint method." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 1 (2013): 119–34. http://dx.doi.org/10.1177/0954406213481915.

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A novel continuous adjoint-based acoustic propagation method is proposed for low-noise turbofan duct design. A fan bypass duct tonal noise propagation model that is verified by comparison with an analytical solution of the modal radiation from a semi-infinite duct with the shear layer is enhanced with its continuous adjoint formulation, having been applied to design the bypass duct. First, this article presents the complete formulation of the time-dependent optimal design problem. Second, a continuous adjoint-based acoustic propagation method for two-dimensional bypass duct configurations is d

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Simon, Frank, Noah H. Schiller, Nicole Pettingill, Nicolas Zawodny, and Matt Galles. "Measurement of airborne sound insulation of building components by near-field acoustic holography." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 7 (2023): 657–67. http://dx.doi.org/10.3397/in_2022_0091.

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Unmanned aerial vehicles (UAVs) are currently being used for reconnaissance missions, tactical surveillance, and infrastructure inspection. When legislation allows it, these devices will provide additional services close to inhabited areas, which could lead to noise complaints. On most UAVs, the propellers are the dominant source of noise. As a result, researchers have studied the impact of propeller shape and blade count on noise. Much of this work, however, has focused on isolated propellers. While different UAV concepts are equipped with ducts for aerodynamic and protection reasons, few stu

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17

Шмырев, Владимир Федорович. "ОСОБЛИВОСТІ ПРОЕКТУВАННЯ НОСКА ПОВІТРОЗАБІРНИКА ТУРБОВЕНТИЛЯТОРНОГО ДВИГУНА". Open Information and Computer Integrated Technologies, № 86 (14 лютого 2020): 25–36. http://dx.doi.org/10.32620/oikit.2019.86.02.

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Optimization of turbofan engine air intake as well as geometry of intake lip, in-let cross-sectional area and its length is a relevant task in optimizing aerodynamic configuration of an aircraft. It is necessary to ensure a smooth entry of air flow into the engine at all modes of its operation and at various aircraft evolutions while minimizing impact on the overall aerodynamic efficiency of the aircraft. Development of engine air intake was once a very long, routine process that could last for months be-fore design completion, followed by expensive tests on determination of air intake perform

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18

Nuckolls, W. E., and W. F. Ng. "Fan Noise Reduction From a Supersonic Inlet During Simulated Aircraft Approach." Journal of Engineering for Gas Turbines and Power 117, no. 2 (1995): 237–44. http://dx.doi.org/10.1115/1.2814086.

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A series of experiments was conducted to investigate the radiation of fan noise from a supersonic inlet during a simulated aircraft approach. A scaled-down model of an axisymmetric, mixed-compression, supersonic inlet (P-inlet) was used in conjunction with a 10.4 cm (4.1 in) diameter turbofan engine simulator as the noise source. The tests were conducted at an outdoor facility under static conditions. The main goal of the experiment was to reduce the forward radiating fan noise by modifying the auxiliary inlet doors. The modified doors are designed to reduce the inlet distortion to the fan fac

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19

Choung, HanAhChim. "Numerical investigation on radiation characteristics of aero-intake noise with ground effects." Journal of the Acoustical Society of America 140, no. 4 (2016): 3141. http://dx.doi.org/10.1121/1.4969845.

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20

Liu, Chen, Yipeng Cao, Yang Liu, Wenping Zhang, Pingjian Ming, and Sihui Ding. "Numerical and experimental analyses of intake silencer and its effects on turbocharger compressor performance." Advances in Mechanical Engineering 11, no. 3 (2019): 168781401982667. http://dx.doi.org/10.1177/1687814019826677.

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Numerical studies of a marine diesel engine intake silencer are conducted to evaluate its performance, and effects of the silencer on the turbocharger compressor performance are also discussed. The results show that the duct acoustic mode method can be used in the silencer transmission loss prediction, and the predicted noise reduction and main frequency range agree with the measurements fairly well. However, it is found that the silencer compromises the compressor performance by shortening its operating range. It is found that the static pressure on the compressor blade surface is decreased,

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21

RICHTER, CHRISTOPH, HANNES LÜCK, ŁUKASZ PANEK, and FRANK THIELE. "METHODS FOR SUPPRESSING SHEAR LAYER INSTABILITIES FOR CAA." Journal of Computational Acoustics 19, no. 02 (2011): 181–203. http://dx.doi.org/10.1142/s0218396x11004420.

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The rearward propagation of tonal noise from the main fan and the engine core of modern high bypass aeroengines is one of the current demanding applications of CAA methods. One of the main features of this problem is the radiation of tones from main fan and turbine through the shear layers of core and bypass jets. This can approximately be described by a solution of the linearized perturbed Euler equations over a sheared turbulent averaged base flow field. However, these equations not only describe sound propagation, but also provide a stability analysis for the sheared base flow. Three techni

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22

Vasilyev, Andrey. "AUTOMOBILE INTERNAL COMBUSTION ENGINE LOW FREQUENCY NOISE REDUCTION USING ACTIVE NOISE CONTROL SOLUTIONS." Akustika 34 (November 1, 2019): 113–17. http://dx.doi.org/10.36336/akustika201934113.

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Increased level of automobile low-frequency noise may cause significant environmental pollution, driver and passenger discomfort etc. For automobile equipped with internal combustion engine forming of either internal or external noise is mainly caused by engine operation. Approaches to automobile low-frequency noise reduction are suggested using active noise control method. The different variants of principal schemes and constructions of electronic units of forming required vibroacoustic characteristic of active noise control system were developed by the author either for complex noise reducti

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23

Gounet, Helene, and Serge Lewy. "Three-Dimensional Sound Directivity around a Helicopter Turboshaft Engine." Journal of the American Helicopter Society 57, no. 4 (2012): 1–10. http://dx.doi.org/10.4050/jahs.57.042002.

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Turboshaft engines can be the main source of noise due to a helicopter at takeoff. Some new silencing designs of the inlets and of the ejector were tested on a Turbomeca Arrius 2B2 engine in an open-air static facility. Intake and exhaust are not axisymmetric, and conventional directivity patterns of sound field on a horizontal arc of circle are insufficient. A special microphone array on a vertical half-circle translating axially was built. Data processing has been implemented to plot maps of sound pressure levels in third-octave bands and to compute sound power levels. Intake and exhaust rad

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24

Fedorov, Volodymyr, Oleksii Korpach, Dmytro Yashchenko, and Volodymyr Bosenko. "EXTERNAL NOISE REDUCTION “NOVATOR” ARMORED CAR USING A HIGHLY EFFICIENT SILENCER." Avtoshliakhovyk Ukrayiny 3, no. 275 (2023): 36–41. http://dx.doi.org/10.33868/0365-8392-2023-3-275-36-41.

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Armored vehicles are widely used for combat operations, for which it is extremely important to be as inconspicuous as possible. There are different types of masking, one of which is reducing the level of external noise. For the Novator armored car, a highly effective muffler of the exhaust gases of the internal combustion engine was devel-oped. The Novator armored car has a pickup-type body, a gross weight of 9,000 kg and a Ford F8 turbodiesel engine with a power of 300 hp. The uniqueness of the developed muffler is that it seeks to return all the sound waves that entered it back to the intake

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Chapman, C. J. "Sound radiation from a cylindrical duct. Part 2. Source modelling, nil-shielding directions, and the open-to-ducted transfer function." Journal of Fluid Mechanics 313 (April 25, 1996): 367–80. http://dx.doi.org/10.1017/s0022112096002248.

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This paper analyses the sound radiated from the front face of a hard-walled circular cylindrical duct in a subsonic mean flow when the duct contains acoustic sources typical of those in a ducted-fan aeroengine. Two main results are established for modes of any given frequency and circumferential order. The first result is that in certain easily calculated directions, called here the nil-shielding directions, the sound radiated by ducted sources is the same as the sound radiated by the corresponding open sources, i.e. by unducted sources of the same distribution and strength radiating into free

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Vasilyev, A. V. "SOFTWARE DEVELOPMENT FOR ESTIMATION OF LOW FREQUENCY SOUND PROPAGATION IN GAS GUIDES OF POWER PLANTS TAKING TO ACCOUNT ACTIVE SOUND SOURCES." Journal of Dynamics and Vibroacoustics 5, no. 4 (2020): 36–44. http://dx.doi.org/10.18287/2409-4579-2019-5-4-36-44.

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This paper is devoted to the problems of modelling and calculation of propagation of low frequency sound in gas guides of power plants taking to account active sound sources. The structure of software for prediction and calculation of low-frequency sound propagation in gas guides have described. Software uses four-pole method and takes to account radiation from additional (active) sound course. By using software it is possible to estimate sound source parameters to provide efficient sound attenuation. Examples of software application to calculation of intake and exhaust noise of internal combu

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O, Zaporozhets, Karpenko S, Puzik S, and Sagaidak B. "MODEL OF SOUND LEVELS CALCULATION FOR NOISE FROM COMPRESSOR STATIONS FOR JUSTIFICATION OF SANITARY PROTECTION ZONE BOUNDARIES." National Transport University Bulletin 1, no. 50 (2021): 81–91. http://dx.doi.org/10.33744/2308-6645-2021-3-50-081-091.

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This article is devoted to the study of sound levels for noise from a gas turbine plant and technological equipment of a compressor station in everyday operation, in order to assess the sustainability of the conditions of sanitary protection zones around the compressor station and in order to protect the population living near the compressor station. The main purpose of the study is to assess the compliance of the sizes of sanitary protection zones in terms of noise load on environment. The main source of noise at compressor gas-pumping stations is determined by the noise regime at the industr

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Руденко, В. В., И. В. Калужинов та Н. А. Андрущенко. "АКУСТИЧНА ПОМІТНІСТЬ БЕЗПІЛОТНИХ ЛІТАЛЬНИХ АПАРАТІВ З СИЛОВИМИ УСТАНОВКАМИ НА БАЗІ ПОРШНЕВИХ ДВИГУНІВ". Open Information and Computer Integrated Technologies, № 88 (6 листопада 2020): 62–80. http://dx.doi.org/10.32620/oikit.2020.88.05.

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The presence in operation of many prototypes of UAVs with propeller propellers, the use of such devices at relatively low altitudes and flight speeds makes the problem of noise reduction from UAVs urgent both from the point of view of acoustic imperceptibility and ecology.The aim of the work is to determine a set of methods that help to reduce the visibility of UAVs in the acoustic range. It is shown that the main source of noise from the UAV on the ground is the power plant, which includes the engine and the propeller. The parameters of the power plants influencing the processes that determin

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Kondrat’ev, Konstantin V., Pavel F. Kiku, Svetlana N. Beniova, et al. "Social and hygienic assessment of the spread of thyroid diseases." HEALTH CARE OF THE RUSSIAN FEDERATION 65, no. 1 (2021): 37–44. http://dx.doi.org/10.47470/0044-197x-2021-65-1-37-44.

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Introduction. Iodine deficiency diseases (IDD) are currently one of the most common pathologies of the endocrine system. The development of these diseases in the Primorsky region depends on the sufficient intake of iodine and various factors of exogenous and endogenous nature. The identification and establishment of the contribution of social and hygienic nature factors in the comprehensive impact to the occurrence and development of thyroid diseases, including IDD, is an important area of research. The aim of the study is to obtain information about the social and hygienic factors that influe

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Buszyk, Martin, Polacsek Cyril, Le Garrec Thomas, Barrier Raphaël, Salze Edouard, and Mardjono Jacky. "Turbofan Aeroacoustics with a Serrated Stator: Design, Predictions, and Comparisons with Measurements." AIAA Journal, June 18, 2025, 1–17. https://doi.org/10.2514/1.j065316.

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This work is devoted to the design and evaluation of a low-noise outlet guide vane (OGV) aiming to reduce the rotor–stator interaction noise using leading-edge serrations and tested on the ECL5 ultrahigh-bypass-ratio model in the PHARE-2 rig at Ecole Centrale Lyon. First, a radially varying 2D design is proposed and evaluated by means of a fast analytical prediction tool and using a strip approach. Then, an iterative process combining 3D Reynolds-averaged Navier–Stokes (RANS) calculations with an in-house modeler is carried out to achieve a suitable 3D geometry while minimizing the aerodynamic

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Christophe, Julien, Julien de Decker, and Christophe Schram. "Jet Noise and Wing Installation Effects of Circular, Beveled and Rectangular Nozzles." Flow, Turbulence and Combustion, February 26, 2024. http://dx.doi.org/10.1007/s10494-024-00533-7.

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AbstractWith the growth of modern turbofan engines, their integration under the wing becomes challenging and induces aerodynamic and acoustic interactions between the jet exhaust and the airframe. Jet noise reduction techniques have been widely studied over the past decades but their efficiency has still to be demonstrated once installed. The present lab-scale jet experiments at Mach 0.6 compare the noise radiated by beveled and rectangular installed nozzles to circular ones on a quarter-sphere radiation map using a microphone antenna. For all radiation angles, modified nozzles show an amplitu

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Nguyen, V. H. "Application of the “actuator disk” boundary condition to calculation of a non-uniform flow in the air intake of modern turbofan engines." Engineering Journal: Science and Innovation, no. 8 (92) (August 2019). http://dx.doi.org/10.18698/2308-6033-2019-8-1909.

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As the degree of bypass ratio of modern aviation turbofan engines increases, their appearance and characteristics change as well: the nacelle diameter increases, the air intake length decreases, and the temperature and jet noise reduce. Due to these circumstances, the design must take into account the interaction between the fan and the air intake as part of configuration. An approach based on unsteady three-dimensional modeling with account for full blade tips is necessary for the analysis, but is resource-intensive. In some cases, an approach based on the “actuator disk” boundary condition c

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Al-Am, Jean, Alexis Giauque, Vincent Clair, Jérôme Boudet, and Fernando Gea-Aguilera. "Direct-Noise of an Ultrahigh-Bypass-Ratio Turbofan: Periodic-Sector vs Full-Annulas Large-Eddy Simulations." AIAA Journal, May 8, 2024, 1–15. http://dx.doi.org/10.2514/1.j063596.

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The tonal and broadband noise of an ultrahigh-bypass-ratio fan stage, which has been developed at École Centrale de Lyon, is studied using large-eddy simulations (LES). Wall-modeled LES of a periodic sector and a 360-deg full fan stage have been performed at approach conditions, which is a relevant operating point for aircraft noise certifications. The fan noise is directly obtained from the fully compressible LES, using a well-refined unstructured mesh, and compared with state-of-the-art analytical models. The impact of the periodic boundary conditions, which are often used for high-fidelity

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Qiu, S. "Design of a low noise turbofan duct via an acoustic gradient-enhanced Kriging method." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, June 17, 2020, 095440622093364. http://dx.doi.org/10.1177/0954406220933640.

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The Kriging models which are frequently used in aerodynamic shape optimization may become computationally inefficient when solving problems with large numbers of design variables. One solution to this problem would be the application of gradient-enhanced Kriging model. A gradient-enhanced Kriging and acoustic adjoint-method approach to duct acoustic problems is developed, aimed to improve the efficiency and accuracy of the existing Kriging approach at acoustic problems with many design parameters. To our knowledge, it is the first application of gradient-enhanced Kriging for duct acoustic prob

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Polacsek, Cyril, Majd Daroukh, Benjamin Francois, and Raphaël Barrier. "Zonal Detached Eddy Simulation of the Fan-OGV Stage of a Turbofan Engine: PartII—Broadband Noise Predictions." Journal of Turbomachinery, June 9, 2022, 1–30. http://dx.doi.org/10.1115/1.4054764.

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Abstract This part II paper presents the broadband noise predictions of a turbofan stage based on an hybrid method proposed by ONERA in the framework of the European project TurboNoiseBB. The numerical approach relies on a ZDES (Zonal Detached Eddy Simulation) strategy that is applied to a fan module at approach condition and tested in AneCom facility (Wildau, Germany). The ZDES method with main aerodynamic flow features are detailed in a companion paper (part I) and this one focuses on acoustic analyses. Acoustic codes based on Amiet's theory and FWH (Ffowcs-Williams and Hawkings) analogy, br

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Pan, Yuning, Aiqin Song, Shizhong Bu, Zhaoqian Chen, Qiuli Huang, and Aijing Li. "The feasibility of low-concentration contrast and low tube voltage in computed tomography perfusion imaging: an animal study." Bioscience Reports 38, no. 1 (2018). http://dx.doi.org/10.1042/bsr20170977.

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Aim: To investigate the feasibility of low-concentration contrast (270 mg/ml) together with low tube voltage (80 kV) and adaptive iterative dose reduction (AIDR)-3D reconstruction in liver computed tomography (CT) perfusion imaging. Method: A total of 15 healthy New Zealand rabbits received two CT scans each. The first scan (control) was acquired at 100 kV and 100 mA with iopromide (370 mg/ml), while the second scan (experimental) was acquired at 80 kV and 100 mA with iodixanol (270 mg/ml) 24 h after the first scan. The obtained images were reconstructed with filtered back projection (FBP) and

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Wu, Lan, Shilong Tang, Wushuang Chen, Xin Chen, Li Zhang, and Ling He. "Study of Low kV, Low Contrast Agent Dosage, and Low Contrast Agent Flow Rate Scan in Computed Tomography Angiography of Children's Liver." Iranian Journal of Radiology 20, no. 4 (2024). http://dx.doi.org/10.5812/iranjradiol-138586.

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Background: During computed tomography (CT) examinations, the presence of radiation material undoubtedly has a certain impact on patients, particularly children, who are more susceptible to radiation. Consequently, finding ways to minimize radiation dosage and mitigate radiation-related risks while enhancing the quality and accuracy of CT scans has become a crucial concern for medical professionals in CT equipment manufacturing companies and radiology departments to contemplate. Objectives: This study aimed to explore the feasibility of low dose and low contrast medium combined with low flow r

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Liu, Zhi-Chao, Sai Zhao, Ze-Peng Ma, Tian-Le Zhang, and Yong-Xia Zhao. "Comparing feasibility of different tube voltages and different concentrations of contrast medium in coronary CT angiography of overweight patients." Journal of X-Ray Science and Technology, October 7, 2022, 1–12. http://dx.doi.org/10.3233/xst-221263.

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OBJECTIVES: To compare image quality, radiation dose, and iodine intake of coronary computed tomography angiography (CCTA) acquired by wide-detector using different tube voltages and different concentrations of contrast medium (CM) for overweight patients. MATERIALS AND METHODS: A total of 150 overweight patients (body mass index≥25 kg/m2) who underwent CCTA are enrolled and divided into three groups according to scan protocols namely, group A (120 kVp, 370 mgI/ml CM); group B (100 kVp, 350 mgI/ml CM); and group C (80 kVp, 320 mgI/ml CM). The CT values, signal-to-noise ratio (SNR), contrast-to

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Gao, Kai, Ze-Peng Ma, Tian-Le Zhang, Yi-Wen Liu, and Yong-Xia Zhao. "Comparative study of abdominal CT enhancement in overweight and obese patients based on different scanning modes combined with different contrast medium concentrations." Journal of X-Ray Science and Technology, January 12, 2024, 1–13. http://dx.doi.org/10.3233/xst-230327.

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PURPOSE: To compare image quality, iodine intake, and radiation dose in overweight and obese patients undergoing abdominal computed tomography (CT) enhancement using different scanning modes and contrast medium. METHODS: Ninety overweight and obese patients (25 kg/m2≤body mass index (BMI)< 30 kg/m2 and BMI≥30 kg/m2) who underwent abdominal CT-enhanced examinations were randomized into three groups (A, B, and C) of 30 each and scanned using gemstone spectral imaging (GSI) +320 mgI/ml, 100 kVp + 370 mgI/ml, and 120 kVp + 370 mgI/ml, respectively. Reconstruct monochromatic energy images of gro

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Zhao, Sai, Zhi-Chao Liu, Yong-Xia Zhao, Tian-Le Zhang, and Zi-Wei Zuo. "A feasibility study of different GSI noise indexes and concentrations of contrast medium in hepatic CT angiography of overweight patients: image quality, radiation dose, and iodine intake." Japanese Journal of Radiology, January 6, 2023. http://dx.doi.org/10.1007/s11604-022-01384-w.

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Gao, Yuan, Huiqiao Xie, Chih‐Wei Chang, et al. "CT‐based synthetic iodine map generation using conditional denoising diffusion probabilistic model." Medical Physics, June 18, 2024. http://dx.doi.org/10.1002/mp.17258.

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AbstractBackgroundIodine maps, derived from image‐processing of contrast‐enhanced dual‐energy computed tomography (DECT) scans, highlight the differences in tissue iodine intake. It finds multiple applications in radiology, including vascular imaging, pulmonary evaluation, kidney assessment, and cancer diagnosis. In radiation oncology, it can contribute to designing more accurate and personalized treatment plans. However, DECT scanners are not commonly available in radiation therapy centers. Additionally, the use of iodine contrast agents is not suitable for all patients, especially those alle

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