Chou C K, McDougall J A, Chan K W, Luk K H
Department of Radiation Research, City of Hope National Medical Center, Duarte, California 91010.
Med Phys. 1990 Jul-Aug;17(4):705-9. doi: 10.1118/1.596470.
Three square (L, M, MS) and one rectangular (HN) applicators with captive boluses were provided by the Clini-Therm Corporation for evaluation. Surface cooling is achieved by attaching a mineral oil captive bolus to the built in water-circulating tubes at the aperture of the applicators. These applicators were tested on a phantom with a 2-cm fat slab over 10-cm-thick muscle. Surface and sagittal heating patterns were obtained using a thermograph. All captive-bolus applicators have heating patterns similar to that of the regular Clini-Therm applicators. Due to hot spots at the edges of the applicators where the E fields terminate, these modified applicators should not be placed in direct contact with patients when boluses are not used. Tests with Clini-Therm regular water bolus instead of the captive oil bolus indicated that the orientation of water flow should be parallel to the E field to minimize perturbation of the heating patterns. Thermal conduction studies showed that the captive bolus reacts too slowly for skin temperature control. The modified captive bolus applicators did not improve the performance of the system.
Clini-Therm公司提供了三个方形（L、M、MS）和一个带有俘获体模的矩形（HN）施源器用于评估。通过将矿物油俘获体模附着在施源器孔径处的内置水循环管上来实现表面冷却。这些施源器在一个带有2厘米脂肪层覆盖10厘米厚肌肉的体模上进行了测试。使用热成像仪获得表面和矢状面加热模式。所有俘获体模施源器的加热模式与常规Clini-Therm施源器相似。由于施源器边缘电场终止处存在热点，当不使用体模时，这些改进后的施源器不应直接与患者接触。用Clini-Therm常规水模而非俘获油模进行的测试表明，水流方向应与电场平行，以尽量减少对加热模式的干扰。热传导研究表明，俘获体模对皮肤温度控制的反应过于缓慢。改进后的俘获体模施源器并未改善系统性能。
