Höver K H, Hesse B M, Oetzel D, Rhein B, Lorenz W J, Engelhart R, Kimmig B, Wannenmacher M
Institut für Radiologie und Pathophysiologie Deutsches Krebsforschungszentrum, Heidelberg.
Strahlenther Onkol. 1991 Nov;167(11):651-7.
Dosimetric properties for stereotaxic convergent beam therapy techniques with small field sizes have been investigated as well as for the linear accelerator Mevatron 77 as for the neutron generator KARIN. Additionally we also measured the dose distribution of single plane rotational therapy. As an indication of quality we calculated the V50 ratio as V50 = (F50-F90)/F90 and the corresponding V20 values. For the single plane irradiation there is a considerable difference in dose distribution in favour of photons. V50 (axial) amounts to 1.77 for photons and to 2.7 for neutrons. For the convergential non coplaner arc-therapy using nine plans there is nearly no difference in the high dose region including the 50%-isodose. V50 (axial): 1.16 and 1.6 respectively; (frontal) 1.36 and 1.35 respectively. Regarding to physical dose distributions our results indicate, that 14-MeV neutrons are suitable for high dosed stereotactic single irradiations.
已经研究了小射野立体定向汇聚束治疗技术的剂量学特性，以及直线加速器Mevatron 77和中子发生器KARIN的剂量学特性。此外，我们还测量了单平面旋转治疗的剂量分布。作为质量指标，我们计算了V50比值，即V50 = (F50 - F90)/F90以及相应的V20值。对于单平面照射，光子的剂量分布有相当大的差异。光子的V50（轴向）为1.77，中子的为2.7。对于使用九个计划的汇聚非共面弧形治疗，在包括50%等剂量线的高剂量区域几乎没有差异。V50（轴向）：分别为1.16和1.6；（ frontal，原文可能有误，推测为frontal ）分别为1.36和1.35。关于物理剂量分布，我们的结果表明，14 MeV中子适用于高剂量立体定向单次照射。
