医用金红石载槽矩形波导阵列

R.C. Gupta, S.P. Singh
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引用次数: 2

摘要

本文从理论上分析和报道了一种直接接触加热介质的金红石加载矩形波导窄壁纵槽线性相控阵,该相控阵可用于治疗腹部或胸部肿瘤。每个槽由同轴线探头激发。我们建议在波导内部填充极低损耗的金红石材料,以提供更好的生物组织阻抗匹配。应用菲涅耳-基尔霍夫标量衍射场理论,导出了加热介质中电场的表达式。在433 MHz下,计算了槽波导阵列作为直接接触器在x-z平面上的比吸收率(SAR)轮廓分布和z方向上的比吸收率分布。得到了槽波导阵列的穿透深度、功率吸收系数和光斑尺寸等参数。将开槽波导阵列的结果与同一频率下的单波导缝的结果进行了比较。结果表明,通过改变阵列各槽激励的相位和幅值,可以改变热点的相对幅值和位置。结果表明,狭缝波导阵列改善了SAR分布和穿透深度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rutile-loaded slotted rectangular waveguide array for medical applications
In this paper, a linear phased array of longitudinal slots in narrow wall of rutile-loaded rectangular waveguide in direct contact with heating medium is theoretically analyzed and reported, which is useful for treatment of cancer in abdomen or chest region. Each slot is excited by a coaxial line probe. It is proposed that the interior of the waveguide be filled with very low loss rutile material to provide a better impedance match to biological tissue. By applying Fresnel-Kirchhoff scalar diffraction field theory, the expression for electric field in heating medium is derived. The contour distribution of specific absorption rate (SAR) in x-z plane and SAR distribution in z-direction due to slotted waveguide array as direct contact applicator is evaluated at 433 MHz. The parameters such as penetration depth, power absorption coefficient and spot size are obtained for slotted waveguide array. The results of slotted waveguide array are compared with those of a single waveguide slot operating at same frequency. It is shown that by changing the phase and amplitude of excitation of each slot of the array, relative amplitude and position of the hot spot can be changed. Results demonstrate that slotted waveguide array offers improvement in SAR distribution and penetration depth.
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