Prior M V, Lumori M L, Hand J W, Lamaitre G, Schneider C J, van Dijk J D
Hyperthermia Clinic, Hammersmith Hospital, London, UK.
IEEE Trans Biomed Eng. 1995 Jul;42(7):694-8. doi: 10.1109/10.391168.
There are a number of potential advantages to be gained by using an array of applicators in hyperthermia treatments compared with single applicator systems. These advantages include the possibility of greater spatial control of power deposition and conformability to nonplanar sites. Arrays of applicators can be driven either coherently or incoherently. In the case of coherent operation, an added advantage is the ability to steer power deposition by varying the phases of the antennas. In this study, we investigated the relative merits of the two modes of operation when a 2 x 2 planar array of current sheet applicators is used. The effective field size (EFS) of the array was calculated using a Gaussian beam representation of the applicators on a layered model in which the fat layer had its thickness varied. Good agreement was obtained between the square of the electric field distribution (E2) and quantitative experimental results. It is shown that when the planar array is used with a fat layer greater than about 2 mm present, it should be driven incoherently as this results in a significantly larger EFS than that obtained when the array is driven coherently.
与单辐射器系统相比，在热疗中使用一系列辐射器有许多潜在的优势。这些优势包括对功率沉积进行更大空间控制的可能性以及对非平面部位的贴合性。辐射器阵列可以相干驱动或非相干驱动。在相干操作的情况下，另一个优势是能够通过改变天线相位来控制功率沉积。在本研究中，当使用由电流片辐射器组成的2×2平面阵列时，我们研究了这两种操作模式的相对优点。在脂肪层厚度可变的分层模型上，使用辐射器的高斯波束表示来计算阵列的有效场大小（EFS）。电场分布的平方（E2）与定量实验结果之间取得了良好的一致性。结果表明，当平面阵列用于存在大于约2mm的脂肪层时，应采用非相干驱动，因为这会导致EFS比阵列相干驱动时显著更大。
