恶性肿瘤放射治疗对骨显像的影响

Effect of radiotherapy for malignancy on bone scanning

目的 观察放射治疗对恶性肿瘤患者核素骨显像的影响。方法 对 4 1例放疗中或放疗后的恶性肿瘤患者行前后位和后前位全身骨扫描。结果 观察放射野骨骼核素分布情况 :(1)增浓的有 5例 ,平均照射剂量为 6 2 .2 Gy,放疗距显像的平均时间为 2 .0 8月 ;(2 )未见明显变化的有 9例 ,平均剂量 4 1.8Gy,平均时间为 13.30月 ;(3)稀疏的有 2 7例 ,平均剂量 73.5 Gy,平均时间 7.31月。结论 放射治疗的剂量。

Objective To observe the effect of radiotherapy for malignancy on bone scanning.Methods 41 patients at mid radiotherapy or post radiotherapy with malignancy underwent bone scanning with Elscint Apex SPX 6 ECT after injection of 99m Tc MDP.Results 1)Radioisotope density on radiative field was observed in 5 cases,at 62 2Gy for average radiotherapentic dosage and 2 08 months for average interval from radiotherapy to imaging;2)No obvious change was found in 9 cases with 41 8Gy for average dosage and 13 30 months for average interval;3)27 cases showed sparse distribution for radioisotope with 73 5Gy for average dosage and 7 31 months for average interval.Conclusion The dosage of radiotherapy and the interval from radiotherapy to imagion can affect the absorbance of the imaging agent by the bone at radiotherapentic field.