Burleson W D, Stutzman C D, Stitt J A, Karlsson U L, Mian T A
Department of Radiology, University of Colorado, Denver 80262.
Int J Radiat Oncol Biol Phys. 1991 Jun;20(6):1347-52. doi: 10.1016/0360-3016(91)90248-3.
Hip prostheses may cause irradiation dose inhomogeneities in conventional four-field target volumes to the pelvis. Two patients, with bilateral and unilateral prostheses, were subjected to thermoluminescent dosimetry measurements in the prostatic urethra during 24 MV photon portal exposures. The results suggested a 13% decrease in absorbed dose only for conventional four-field beam geometry with bilateral prostheses, as compared to oblique four-field beam geometry or unilateral prosthesis. This supports the suggestion that beam technique modifications may be warranted for patients with hip prostheses.
髋关节假体可能会在骨盆的传统四野靶区中导致辐射剂量不均匀。两名患者，分别有双侧和单侧假体，在24兆伏光子射野照射期间，对其前列腺尿道进行了热释光剂量测定。结果表明，与斜四野射野几何形状或单侧假体相比，仅双侧假体的传统四野射野几何形状的吸收剂量降低了13%。这支持了对于有髋关节假体的患者可能需要调整射野技术的建议。
