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几乎所有胰腺癌病人都具有局部病变难以控制的特点,因此提高局部一区域治疗效果将有助于提高存活率和达到姑息疗效。过去七年中在美国U--TMB和MDAH进行一组临床实验,用快中子及混合束(快中子加高能光子)治疗15例,并与光子外照射组及~198)Au植入组的疗效进行比较。快中子的物理特点:快中子束是以50Mev重氢核轰击铍靶而产生(50Mevd→Be)平均中子能量为22Mev。中子束剂量用组织等效电离室浸入组织等效液(ρ=1.07g/cm~3)中测量,其物理剂量以rad表示,包括中子和r线成份(radnr)。本文用中子束治疗的病人其物理剂量用下面方式表示:①
Almost all patients with pancreatic cancer have the characteristics that the local lesions are difficult to control, so improving the local-regional therapeutic effect will help improve the survival rate and achieve palliative efficacy. A series of clinical trials in U-TMB and MDAH in the United States in the past seven years, 15 cases treated with fast neutrons and mixed beams (fast neutrons plus high-energy photons), and photon external irradiation group and ~198) Au implants The efficacy of the group was compared. The physical characteristics of fast neutrons: The fast neutron beam is produced by bombarding the target with 50 MeV heavy hydrogen atoms (50 MeVd → Be) with an average neutron energy of 22 MeV. The neutron beam dose was measured by immersing in a tissue-equivalent ionization chamber (ρ=1.07 g/cm 3 ). The physical dose was expressed in rad and included neutron and r-ray components (radnr). The physical dose of patients treated with neutron beams in this paper is expressed as follows: 1