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| | The study was based on the maths model of waves which were reflected by a reflecting ellipsoid and whose distributing of energy in the ellipsoid. We developed an equipment by ellipsoidal focus to substitute for energy based on the research. The equipment has the characteristics of revolving therapy as the X-knife and the r-knife which can be used in 3D therapy. We call the system "Ultrasonic-knife" which were used in 3D hyperthermia. The equipment simulates an source of energy by the ellipsoidal focus. The ... | | 本研究基于波在椭圆体反射面的作用下能量分布的数学模型研制了一种椭圆聚焦超声换能器,该换能器本身具有X刀、γ刀等三维立体定向治疗设备的旋转治疗特点,基于这种换能器的立体定向热疗设备为超声刀,该设备利用椭圆反射聚焦虚拟了另外一个能量源,能不受辐射源外形的限制,将虚拟的能量源放在肿瘤的位置,并且能避免由于焦点所产生的局部热点、加温面积有限等缺点,通过合理的治疗计划实现理想的适形热疗。 | | 文摘来源 | | In order to improve therapeutic effects,the distribution of electromagnetic fields arisen by the magnetic fluid hyperthermia (MFH) treatment system need be investigated more explicitly. Three-dimensional finite element method (FEM) models for the prototype of the MFH treatment system designed by us were constructed and optimized. The distribution in static and harmonic magnetic fields were calculated and the magnetic intensities were compared when the spans of atmosphere between magnetic poles were 20 to 40... | | 为清楚了解磁流体热疗设备产生的电磁场的分布 ,本文采用有限元方法对自制的设备原型建立三维模型并进行了优化 ,计算了该模型在静态和谐态下产生的电磁场的分布 ,对磁极中间的气隙宽度在 2 0~ 40mm范围内变化时的磁场强度进行了对比 .选取气隙宽度为 30mm时计算电磁场的磁场强度、电感和涡流损耗 ,所得结果与实验测量值完全吻合 ,验证了模拟计算的可靠性 . | | 文摘来源 | | Objective: To evaluate the efficacy and side-effect of radiotherapy with radiofrequency hyperthermia(H) and radiotherapy alone (R) for locally advanced un-resectable or recurrent, rectal cancer. Methods: Eighty-three patients were treated with combined radiation therapy and radiofrequency hyperthermia or radiation alone in our hospital, from 1998-2002 were retrospectively studied. Fifty-one patients received radiotherapy alone by conventional pelvic 40-46Gy, a further 20-26Gy was given to a small volume to ... | | 目的 :探讨射频热疗结合放射治疗对局部晚期和 (或 )复发性直肠癌的安全性及初步疗效 ,并与单纯放疗的病人比较。方法 :分析本院 1998~ 2 0 0 2年收治的 83例中晚期直肠癌患者。其中 5 1例给予单外疗 (单放组 ) ,予全盆腔放疗 ,用 8MV -X线 ,放疗剂量 (DT) 4 0~ 4 6Gy ,局部缩野DT2 0~ 2 6Gy ,总DT6 0~ 6 6Gy ,均为常规分割。 32例予外放疗结合射频热疗 (热放组 ) ,放疗方法及剂量同单纯放疗组。热疗设备选用ZRL -Ⅰ型射频热疗机。 2例为腔内热疗 ,其余均为腹部透热 ,提升肿块局部温度达 4 1°~ 4 3℃ ,并维持 4 5~ 6 0分钟 ,热疗 2次 /周 ,每个疗程 6次。结果 :(1)症状的改变 :对有疼痛症状者采用自身对比法 ,热放组共 2 3例 ,疼痛缓解率 91.3%。单放组 4 0例伴有疼痛 ,症状缓解率 6 7.5 % (P <0 .0 5 )。热放组 18例便血 ,缓解率88.9% ,单放组 31例 ,缓解率 6 1.3% (P <0 .0 5 )... | | 文摘来源 | |   | | << 更多相关文摘 |
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