Physics Open最新文献

Weak abnormal vibration monitoring of multiple reference sensors for OPGW lines based on TOC optimization 基于TOC优化的OPGW线路多参考传感器弱异常振动监测

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2026-02-01 DOI: 10.1016/j.physo.2026.100371

Ying Zhang , Hui Meng , Tianlong Bu , Hanpeng Kou , Helen Law

To address the limitations of existing fiber-optic sensing technologies in capturing weak-amplitude, high-precision forward-looking vibration data streams, this study proposes a novel prediction method based on a tornado optimizer with Coriolis force optimization. This method predicts abnormal vibration signals in optical-fiber composite overhead ground wire lines. The processing flow for multiple reference signals within the TOC-CNN-LSTM algorithm is theoretically derived. The hyperparameters are initialized, followed by fitness evaluation, algorithm state updates, and iterative optimization to output the global optimal solution. Experiments are conducted on a 220-kV transmission line in eastern Inner Mongolia, with six sensors providing multi-point reference signal inputs. The experimental results indicate that the predicted outcomes for both training and test sets closely align with actual measurements, exhibiting high accuracy. Compared to traditional algorithms, the proposed method demonstrates smaller prediction errors, superior stability, and enhanced reliability in error distribution analysis. Finally, ten datasets are processed using five algorithms, with runtime, accuracy, root mean square error, and relative percent difference metrics compared. The GA-BP algorithm achieved the shortest runtime with 14.892 s, while BOA-CNN-LSTM required the longest with 85.281 s. In terms of accuracy, the algorithms achieved 82.136 %, 90.652 %, 94.901 %, 95.633 %, and 97.846 %, respectively. The TOC-CNN-LSTM algorithm yielded optimal performance for 97.846 % accuracy, with an root mean square error of 0.420 % and relative percent difference of 5.156 %. Its comprehensive superiority confirms significant engineering application potential for distributed multi-point abnormal vibration monitoring.

为了解决现有光纤传感技术在捕获弱振幅、高精度前视振动数据流方面的局限性，本研究提出了一种基于科里奥利力优化的龙卷风优化器的新型预测方法。该方法预测了光纤复合架空地线中的异常振动信号。从理论上推导了TOC-CNN-LSTM算法中多个参考信号的处理流程。初始化超参数，然后进行适应度评估、算法状态更新和迭代优化，输出全局最优解。实验在内蒙古东部一条220 kv输电线路上进行，6个传感器提供多点参考信号输入。实验结果表明，训练集和测试集的预测结果与实际测量值接近，具有较高的准确性。与传统算法相比，该方法预测误差小，稳定性好，误差分布分析可靠性高。最后，使用五种算法对10个数据集进行处理，并对运行时间、精度、均方根误差和相对百分比差异指标进行比较。GA-BP算法运行时间最短，为14.892 s，而BOA-CNN-LSTM算法运行时间最长，为85.281 s。在准确率方面，算法分别达到82.136%、90.652%、94.901%、95.633%和97.846%。TOC-CNN-LSTM算法的准确率为97.846%，均方根误差为0.420%，相对差为5.156%。其综合优势证实了分布式多点异常振动监测的重大工程应用潜力。

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引用次数: 0

The enhancement of the interfacial thermal conductance at the Cu/Si heterointerface by the amorphous carbon intermediate layer 非晶碳中间层对Cu/Si异质界面界面导热性能的增强

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2026-01-10 DOI: 10.1016/j.physo.2026.100370

Nana Zhang

Heterostructures with different amorphous carbon (a-C) areas are fabricated through simulated magnetron sputtering and mask plates using molecular dynamics simulation. The rationality of the structures is analyzed by number/mass density, hybridization ratio of bonds, radial distribution function and bond angle distribution. Furthermore, the effect of the coverage area of a-C on the interfacial thermal conductance (ITC) of Cu/a-C/Si heterostructures is analyzed in depth. The results showed that the fully covered amorphous carbon insertion layer improves ITC by 67.84 % compared to Cu/Si heterostructure without a-C insertion layer. Phonon density of states (PDOS) shows that phonons within 0–8 THz dominate the heat transport at the heterointerface, and the increase in the coverage area of a-C enhances interfacial phonon transmission in 0–8 THz, allowing phonons to carry more heat energy across the heterointerface. The results and conclusion would have important guiding significance for enhancing the thermal transfer performance of semiconductor devices.

采用分子动力学模拟方法，通过磁控溅射和掩膜制备了具有不同非晶碳（a-C）区域的异质结构。通过数/质量密度、键的杂化比、径向分布函数和键角分布分析了结构的合理性。进一步分析了a-C覆盖面积对Cu/a-C/Si异质结构界面热导率的影响。结果表明，与不含碳插入层的Cu/Si异质结构相比，完全覆盖非晶碳插入层的ITC提高了67.84%。声子态密度（PDOS）表明，0-8 THz范围内的声子主导着异质界面的热传输，a-C覆盖面积的增加增强了0-8 THz范围内的界面声子传输，使声子能够携带更多的热能穿过异质界面。研究结果和结论对提高半导体器件的传热性能具有重要的指导意义。

引用次数: 0

Optical modulation and thickness-dependent structural evolution in CuO thin films for PEC-water splitting CuO薄膜中PEC-water分裂的光调制和厚度相关结构演化

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2026-01-09 DOI: 10.1016/j.physo.2026.100369

Alaaeldin Mohamed , Mohamed Sh Abdel-wahab , Mohamed Egiza , Mohamed Ragab Diab , Wael Z. Tawfik , Ahmed A. Farghali

Copper oxide (CuO) thin films were deposited by RF magnetron sputtering from a high-purity copper target in an argon–oxygen plasma with a fixed oxygen flow of 20 sccm, and the effect of film thickness (105–410 nm) on structural, optical, and photoelectrochemical properties was systematically evaluated. X-ray diffraction and field-emission scanning electron microscopy demonstrate that increasing thickness promotes progressive crystallite growth and microstructural densification, with the average grain size increasing by 28 % from 13 ± 0.5 nm to 17 ± 0.5 nm, accompanied by reduced lattice disorder. These structural improvements directly modulate the optical response, leading to an 18 % narrowing of the optical band gap from 1.98 to 1.62 eV and a 5 % increase in refractive index from 2.7 ± 0.01 to 2.83 ± 0.03, reflecting enhanced optical density and stronger light–matter interaction. Photoelectrochemical measurements further reveal a clear thickness dependence, where the 410 nm CuO film delivers a maximum photocurrent density of approximately −2.8 mA cm⁻² at −1.0 V versus RHE, indicating more efficient charge generation and transport. The results demonstrate that thickness modulation during room-temperature RF sputtering is a key factor linking microstructural evolution with optical and photoelectrochemical performance, enabling rational optimization of CuO thin films for PEC water-splitting applications.

采用射频磁控溅射技术，在固定氧流量为20 sccm的氩氧等离子体中制备了氧化铜（CuO）薄膜，系统地研究了薄膜厚度（105 ~ 410 nm）对结构、光学和光电化学性能的影响。x射线衍射和场发射扫描电镜显示，厚度的增加促进了晶体的逐渐生长和微观结构的致密化，平均晶粒尺寸从13±0.5 nm增加到17±0.5 nm，增加了28%，同时晶格无序性降低。这些结构的改进直接调节了光学响应，导致光学带隙从1.98 eV缩小18%到1.62 eV，折射率从2.7±0.01增加到2.83±0.03，增加了5%，反映了增强的光密度和更强的光-物质相互作用。光电化学测量进一步揭示了明显的厚度依赖性，其中410 nm的CuO薄膜在- 1.0 V时与RHE相比提供了约- 2.8 mA cm - 2的最大光电流密度，表明更有效的电荷产生和传输。结果表明，室温射频溅射过程中的厚度调制是连接微观结构演变与光学和光电化学性能的关键因素，可以合理优化用于PEC水分解的CuO薄膜。

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引用次数: 0

Forecasting new charmonium mass spectra in the framework of the non-relativistic quark model by using AL1 and AL2 potentials 利用AL1和AL2势在非相对论夸克模型框架下预测新的调和子质谱

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2026-01-07 DOI: 10.1016/j.physo.2025.100367

Weeam S. Albaltan , R.F. Alnahdi , Ali A. Alkathiri , S.A. Abd El-Azeem , Atef Ismail , M. Allosh

We examine two phenomenological, non-relativistic

q \overline{q}

potential models (AL1, AL2), which fit the low-lying charmonium spectra. By solving the two-body Schrödinger equation based on Numerov technique, the whole spectrum of these mesons as well as the wavefunctions are obtained. The yielded productions of the wavefunctions and mass spectra using both the distinct models are identical. In the mass range of 2.90–4.30 GeV, we observed many resonant states with vector quantum numbers J^PC = 0⁺⁺, 1⁺⁺, and 3^--. The findings underscore the reliability of the considered AL1 and AL2 potentials in forecasting new charmonium mass spectra.

我们研究了两个现象学的，非相对论性的qq形式的势能模型（AL1, AL2），它们适合低处的charmonium谱。利用数值方法求解两体Schrödinger方程，得到了这些介子的全谱和波函数。用两种不同的模型得到的波函数和质谱是相同的。在2.90 ~ 4.30 GeV的质量范围内，我们观察到许多矢量量子数JPC = 0++、1++和3—的共振态。研究结果强调了所考虑的AL1和AL2势在预测新的charmonium质谱中的可靠性。

引用次数: 0

Investigation of thermo-magnetic properties in Ni-nanoparticles and Ni-PVA composites ni -纳米颗粒及Ni-PVA复合材料的热磁性能研究

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2026-01-05 DOI: 10.1016/j.physo.2026.100368

Mahmoud A. Hamad , Hatem R. Alamri , Ashraf M. Mohamed , Yasser I. Khedr , Mohamed E. Harb , Sameh M. Elghnam

To simulate the magnetocaloric effect (MCE) of Ni-nanoparticles and Ni-PVA composites, a phenomenological model (PM) is used. The MCE parameters of Ni-nanoparticles and Ni-PVA composites are calculated as the results of magnetization vs. temperature simulations. The cryogenic temperature range of MCE in Ni-nanoparticles and Ni-PVA composites is 10–40 K. Furthermore, Ni-nanoparticles serve important roles in tailoring the specific heat variability and changing the temperature range that covers this variation. In comparison, the MCE parameters of Ni-nanoparticles and Ni-PVA composites are therefore larger than the various MCE parameters of some published magnetocaloric (MC) samples. It is stated that Ni-nanoparticles and Ni-PVA composites could be utilized in effective cryogenic MR as MC magnets.

为了模拟ni -纳米粒子和Ni-PVA复合材料的磁热效应，采用了一种现象学模型（PM）。通过对ni -纳米粒子和Ni-PVA复合材料磁化温度的模拟，计算了其MCE参数。MCE在ni -纳米粒子和Ni-PVA复合材料中的低温范围为10-40 K。此外，镍纳米颗粒在调整比热变异性和改变覆盖这种变化的温度范围方面发挥着重要作用。相比之下，ni -纳米粒子和Ni-PVA复合材料的MCE参数大于一些已发表的磁热（MC）样品的各种MCE参数。ni -纳米粒子和Ni-PVA复合材料可以作为MC磁体有效地应用于低温磁流变中。

引用次数: 0

Analysis and modeling of fractional Mandelbrot scaling for parameterization-invariant theories for mechanical systems 机械系统参数化不变理论的分数阶Mandelbrot标度分析与建模

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2026-01-03 DOI: 10.1016/j.physo.2025.100365

Yazen M. Alawaideh , Bashar M. Al-khamiseh , Shajar Abbas , Ioan-Lucian Popa , Hala Ghannam , Tasneem Alayed

This study presents a comprehensive analysis and modeling framework that integrates Mandelbrot's fractal scaling with fractional variational principles to advance the understanding of parameterization-invariant theories for mechanical systems. Using the principle of least action, we derive the Euler–Lagrange equations of motion for two key scenarios that emphasize the preservation of symmetry in mathematical formulations.

In the first scenario, Mandelbrot's fractal scaling laws are incorporated into variational problems by reformulating the action integral using a scaling measure, which allows time to be parameterized accordingly. This approach yields Euler–Lagrange equations exhibiting intrinsic symmetries that reflect the self-similar and scale-invariant properties characteristic of fractal geometries, thereby extending classical mechanics into fractional-dimensional spaces.

The second scenario focuses on the role of fractional calculus in modeling mechanical systems, particularly on symmetry-preserving fractional formulations. Taking a fractional spring pendulum as a case study, we begin by deriving the classical equations of motion from the traditional Lagrangian formulation. Subsequently, the model is extended to fractional domains by employing fractional Euler–Lagrange equations based on both singular and non-singular kernels, such as the Caputo and Atangana–Baleanu derivatives. This extension introduces fractional symmetries that generalize classical system symmetries, thereby enriching the theoretical framework.

Numerical simulations illustrate the influence of the fractional order and initial conditions on the dynamic response of the system, confirming that fractional calculus enhances model accuracy while preserving and generalizing essential symmetry properties. The results highlight the significant impact of incorporating fractional dynamics and fractal scaling on understanding complex mechanical behaviors influenced by memory and non-local interactions. Overall, this work demonstrates a novel intersection of fractal geometry, fractional calculus, and nonlinear dynamics, offering a unified parameterization-invariant approach to studying mechanical systems in fractional-dimensional spaces. The findings provide new insights into the fundamental connections between symmetry, scaling laws and fractional dynamics, with potential applications spanning physics, engineering and applied mathematics.

本研究提出了一个综合的分析和建模框架，将Mandelbrot的分形尺度与分数变分原理相结合，以促进对机械系统参数化不变理论的理解。利用最小作用原理，我们推导了欧拉-拉格朗日运动方程的两个关键场景，强调在数学公式中保持对称性。在第一个场景中，Mandelbrot的分形标度定律被纳入变分问题，通过使用标度度量重新表述动作积分，从而允许时间被相应地参数化。这种方法产生的欧拉-拉格朗日方程表现出内在的对称性，反映了分形几何的自相似和尺度不变特性，从而将经典力学扩展到分数维空间。第二种情况侧重于分数阶微积分在机械系统建模中的作用，特别是在保持对称的分数阶公式上。以分数弹簧摆为例，我们首先从传统的拉格朗日公式推导出经典的运动方程。随后，利用基于奇异核和非奇异核的分数阶欧拉-拉格朗日方程（如Caputo和Atangana-Baleanu导数）将模型扩展到分数阶域。这一扩展引入了分数对称，推广了经典系统对称，从而丰富了理论框架。数值模拟说明了分数阶阶和初始条件对系统动态响应的影响，证实了分数阶微积分在保持和推广基本对称性的同时提高了模型精度。研究结果强调了分数阶动力学和分形标度对理解受记忆和非局部相互作用影响的复杂力学行为的重要影响。总的来说，这项工作展示了分形几何、分数阶微积分和非线性动力学的一个新的交叉点，为研究分数维空间中的机械系统提供了一个统一的参数化不变方法。这些发现为对称、比例定律和分数动力学之间的基本联系提供了新的见解，具有跨越物理、工程和应用数学的潜在应用。

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引用次数: 0

Mid-infrared filters based on subwavelength grating structures supporting high-Q resonance modes 基于支持高q共振模式的亚波长光栅结构的中红外滤波器

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-30 DOI: 10.1016/j.physo.2025.100366

Yuanhang Zhao , Zhihui Wei , Kai Wang , Bo Wang , Guiyan zhao , Yan Wang

We propose a notch filter based on a subwavelength grating structure, featuring ultra-narrowband suppression characteristics within the mid-infrared spectrum (3–5 μm). The device leverages Fano resonance generated by the coupling between Fabry–Pérot cavity modes and surface plasmon polaritons. By introducing controlled nanoscale perturbations within the unit cell, a high-Q resonant state is excited, resulting in a narrow linewidth of 1.08 nm in the transmission spectrum. The resonance depth can be freely adjusted via the grating duty cycle, while the quality factor increases with the degree of asymmetry, reaching up to 3900. The structure also exhibits a strong response to variations in the ambient refractive index while maintaining a high quality factor (>800), and demonstrates a high sensing sensitivity of 798 nm/RIU. This work establishes a versatile and robust platform for high-performance mid-infrared filtering and sensing applications, including refractive index detection, molecular spectroscopy, thermal imaging, and gas sensing.

我们提出了一种基于亚波长光栅结构的陷波滤波器，在中红外光谱（3-5 μm）范围内具有超窄带抑制特性。该装置利用法布里-帕姆罗腔模式和表面等离子激元之间耦合产生的法诺共振。通过在晶胞内引入可控的纳米级扰动，激发出高q谐振态，使得透射光谱的线宽窄至1.08 nm。谐振深度可以通过光栅占空比自由调节，而质量因子随着不对称程度的增加而增加，最高可达3900。该结构在保持高品质因子（>800）的同时，对环境折射率的变化也表现出强烈的响应，并表现出798 nm/RIU的高传感灵敏度。这项工作建立了一个多功能和强大的平台，用于高性能中红外滤波和传感应用，包括折射率检测，分子光谱，热成像和气体传感。

引用次数: 0

Investigation of oscillatory second-grade fluid flow through porous media under slip and thermal influences 滑移和热影响下二阶流体在多孔介质中的振荡流动研究

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-27 DOI: 10.1016/j.physo.2025.100363

Z. Abbas, A. Gull, G. Nazik, M.Y. Rafiq, M. Mujahid

This study presents an analytical investigation of oscillatory magnetohydrodynamic (MHD) flow of an electrically conducting second-grade fluid through a porous medium, incorporating the combined influences of velocity slip, thermal radiation, and a first-order chemical reaction. The governing momentum, energy, and concentration equations are formulated using the Boussinesq approximation and Darcy's law, assuming laminar, incompressible, and time-dependent flow. Through appropriate similarity transformations, the system is reduced to a set of ordinary differential equations, for which exact solutions for velocity, temperature, and concentration are derived. The results reveal that magnetic field strength and buoyancy forces significantly suppress fluid velocity due to enhanced Lorentz and thermal resistance effects, whereas thermal radiation elevates temperature throughout the channel. Increasing the Schmidt number and reaction rate reduces solute concentration, indicating diminished mass diffusivity. Heat and mass transfer characteristics, quantified through Nusselt and Sherwood numbers, show that higher Prandtl numbers enhance thermal transport, while stronger chemical reactions lower mass transfer rates. The main novelty of this work lies in obtaining closed-form solutions for oscillatory second-grade fluid flow in a porous medium under the simultaneous effects of slip, radiation, and chemical reaction, offering benchmark results and valuable physical insights for applications in heat exchangers, catalytic reactors, polymer processing, and biomedical flow control systems.

本文对一种导电二级流体在多孔介质中的振荡磁流体动力学（MHD）流动进行了分析研究，考虑了速度滑移、热辐射和一级化学反应的综合影响。控制动量、能量和浓度方程是使用Boussinesq近似和Darcy定律制定的，假设层流、不可压缩和随时间变化的流动。通过适当的相似变换，将系统简化为一组常微分方程，并推导出速度、温度和浓度的精确解。结果表明，由于洛伦兹和热阻效应的增强，磁场强度和浮力显著抑制流体速度，而热辐射则升高整个通道的温度。增加施密特数和反应速率降低溶质浓度，表明质量扩散系数降低。通过Nusselt和Sherwood数量化的传热传质特性表明，更高的普朗特数增强了热传递，而更强的化学反应降低了传质速率。这项工作的主要新颖之处在于获得了在滑移、辐射和化学反应同时作用下多孔介质中振荡二级流体流动的封闭形式解，为热交换器、催化反应器、聚合物加工和生物医学流动控制系统的应用提供了基准结果和有价值的物理见解。

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引用次数: 0

Spiral Compactification with torsion-monodromy locking 具有扭转单锁的螺旋紧化

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-26 DOI: 10.1016/j.physo.2025.100364

Matthew C. Allaby

We present a unified geometric framework in which spiral compactification with torsion and monodromy locking defines a minimal invariant structure governing spectra, interactions, and stability in a five dimensional Kaluza–Klein type setting. The construction introduces a compact spiral dimension endowed with intrinsic torsion, where monodromy fixes allowed winding modes and removes ambiguities associated with conventional compactification schemes. A central result is the identification of a minimal invariant,

D_{min}

, which uniquely determines admissible field configurations, vertical mode spectra, and coupling structure across gravitational and gauge sectors.

Unlike standard approaches that rely on additional symmetry assumptions or external stabilization mechanisms, the present framework derives spectral discreteness and mode selection directly from geometric and topological constraints. We show that torsion and monodromy locking lead to robust quantization conditions, suppress pathological zero modes, and yield a constrained but flexible parameter space compatible with known four dimensional physics. To illustrate the formalism, we provide representative examples and limiting cases that connect the theory to familiar Kaluza–Klein models, as well as to torsion driven phenomena in cosmology and condensed matter systems.

These results establish a mathematically rigorous yet physically motivated foundation for unification based on spiral geometry. The framework is falsifiable in principle through its predicted mode structure and torsion induced spectral features, offering clear pathways toward phenomenological investigation in high energy physics, cosmology, and analog systems.

我们提出了一个统一的几何框架，其中具有扭转和单锁的螺旋紧化定义了在五维Kaluza-Klein型设置中控制光谱，相互作用和稳定性的最小不变结构。该结构引入了具有固有扭转的紧凑螺旋尺寸，其中单一性固定允许缠绕模式，并消除了与传统紧化方案相关的模糊性。一个中心结果是最小不变量Dmin的识别，它唯一地决定了可接受的场构型、垂直模式谱以及引力和规范扇区之间的耦合结构。与依赖于额外对称假设或外部稳定机制的标准方法不同，本框架直接从几何和拓扑约束中获得光谱离散性和模式选择。我们证明了扭转和单一性锁定导致鲁棒量化条件，抑制病态零模式，并产生与已知四维物理兼容的受限但灵活的参数空间。为了说明形式主义，我们提供了代表性的例子和限制情况，将理论与熟悉的Kaluza-Klein模型以及宇宙学和凝聚态系统中的扭转驱动现象联系起来。这些结果为基于螺旋几何的统一建立了数学上严谨但物理上有动机的基础。该框架通过其预测的模式结构和扭致光谱特征在原则上是可证伪的，为高能物理、宇宙学和模拟系统的现象学研究提供了明确的途径。

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引用次数: 0

Dosimetric and radiobiological parameters in brain cancers: A comparison of IMRT and VMAT techniques 脑癌的剂量学和放射生物学参数：IMRT和VMAT技术的比较

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-23 DOI: 10.1016/j.physo.2025.100362

Hamed Zamani , Mohsen Saeb , Shahram Monadi , Mostafa Alizade-Harakiyan , Ali Akhavan , Amin Khodaei , Alireza Farajollahi , Mikaeil Molazadeh

Aim

This study aimed to perform a physics-driven comparison of volumetric modulated arc therapy (VMAT) and intensity-modulated radiation therapy (IMRT) for brain cancers by integrating quantitative dosimetric indices derived from Monte Carlo–based dose calculation and radiobiological modeling. Plans prescribed at 50 Gy and 60 Gy were evaluated to investigate both physical dose distribution characteristics and predicted biological outcomes.

Materials and methods

Eighty-four computed tomography (CT) datasets of brain cancer patients (mean age, 51.9 ± 12.8 years) were used for treatment planning. IMRT plans were generated using 7–9 non-coplanar fields, while VMAT plans employed a single full clockwise arc. Dose calculations were performed using a Monte Carlo algorithm within the treatment planning system to ensure accurate modeling of dose deposition in heterogeneous intracranial tissues. Quantitative dosimetric parameters, including minimum, mean, maximum doses and dose–volume metrics, were extracted. Conformity index (CI) and homogeneity index (HI) were calculated to assess plan quality from a physics standpoint. For radiobiological evaluation, dose–volume histograms (DVHs) were exported to Biosuit software to compute tumor control probability (TCP) using Niemierko's EUD-based model and normal tissue complication probability (NTCP) for organs at risk (OARs) using the Lyman–Kutcher–Burman (LKB) model.

Results

VMAT demonstrated significantly shorter delivery times compared with IMRT (7.52 ± 0.60 vs. 11.20 ± 1.14 min; P = 0.012) and required fewer monitor units per fraction, reflecting higher delivery efficiency. Quantitative dosimetric analysis revealed significant differences in D_min, D2 %, HI (0.12 ± 0.07 for VMAT vs. 0.14 ± 0.08 for IMRT; P = 0.01), and CI (0.76 ± 0.05 for VMAT vs. 0.72 ± 0.05 for IMRT; P < 0.001), indicating improved dose conformity and homogeneity with VMAT. Radiobiological modeling showed higher TCP for VMAT (0.83 ± 0.07 vs. 0.80 ± 0.06; P = 0.04) and generally lower NTCP and EUD values for several OARs, although most NTCP differences were not statistically significant. Lower prescription dose (50 Gy) resulted in reduced OAR doses and NTCP values compared with 60 Gy.

Conclusion

From a medical physics perspective, VMAT provides superior dosimetric performance and delivery efficiency compared with IMRT, while Monte Carlo–based dose calculation and radiobiological modeling suggest modest improvements in predicted tumor control and normal tissue sparing. The integration of advanced dose calculation algorithms with TCP/NTCP analysis enhances understanding of the physical–biological interplay in intracranial radiotherapy planning.

目的本研究旨在通过整合基于蒙特卡洛剂量计算和放射生物学模型得出的定量剂量学指标，对体积调制电弧治疗（VMAT）和调强放疗（IMRT）治疗脑癌进行物理驱动的比较。评估了50gy和60gy的剂量计划，以研究物理剂量分布特征和预测的生物学结果。材料与方法采用84例脑癌患者（平均年龄51.9±12.8岁）的CT数据集制定治疗方案。IMRT计划使用7-9个非共面场生成，而VMAT计划使用单个完整的顺时针弧。在治疗计划系统中使用蒙特卡罗算法进行剂量计算，以确保对异质性颅内组织中的剂量沉积进行准确建模。提取定量剂量学参数，包括最小、平均、最大剂量和剂量-体积指标。计算一致性指数（CI）和均匀性指数（HI），从物理角度评估计划质量。放射生物学评估，将剂量-体积直方图（DVHs）输出到Biosuit软件，使用Niemierko基于eud的模型计算肿瘤控制概率（TCP），使用Lyman-Kutcher-Burman （LKB）模型计算危险器官（OARs）的正常组织并发症概率（NTCP）。结果vmat与IMRT相比递送时间明显缩短（7.52±0.60 vs 11.20±1.14 min; P = 0.012），每分数所需的监护单位更少，反映出更高的递送效率。定量剂量学分析显示，Dmin、D2 %、HI （VMAT组0.12±0.07，IMRT组0.14±0.08,P = 0.01）和CI （VMAT组0.76±0.05，IMRT组0.72±0.05,P < 0.001）差异有统计学意义，表明VMAT的剂量一致性和均匀性得到改善。放射生物学模型显示VMAT的TCP较高（0.83±0.07 vs. 0.80±0.06;P = 0.04），几种桨的NTCP和EUD值普遍较低，尽管大多数NTCP差异无统计学意义。与60 Gy相比，较低的处方剂量（50 Gy）导致OAR剂量和NTCP值降低。结论从医学物理学的角度来看，VMAT与IMRT相比具有更好的剂量学性能和递送效率，而基于蒙特卡罗的剂量计算和放射生物学模型表明，VMAT在预测肿瘤控制和正常组织保留方面有适度的改善。将先进的剂量计算算法与TCP/NTCP分析相结合，增强了对颅内放疗计划中物理-生物相互作用的理解。

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引用次数: 0