^(89)Sr韧致辐射显像的初步观察

Primary Observation of 89 Sr Bremsstrahlung Imaging

目的 探索８９Ｓｒ 韧致辐射显像的最佳采集因子。方法 以２ 个相同规格分别装有约１４－８ ＭＢｑ 的８９Ｓｒ及９９ｍＴｃ 液体的玻璃瓶为模型，用Ｐｈｉｌｉｐｓ ＳＰＥＣＴ 及Ｅｌｓｃｉｎｔ 双头ＳＰＥＣＴ在不同条件下进行测试或显像。结果 ８９Ｓｒ韧致辐射的能谱为一连续曲线，主能峰约为７９ｋｅＶ，适当范围能窗并配以针孔、发散型、中能或高能平行孔准直器时即可获得信／ 噪比及灵敏度均较高的理想图像。另外，有必要对原始资料进行衰减校正。结论 利用韧致辐射是能够对８９Ｓｒ 纯β体成像的。

Purpose To find optimum acquisition factors of 89 Sr bremsstrahlung imaging.Methods 2 similar glass bottles filled with some 14 8 MBq 89 Sr Chloride and 99m Tc fluid respectively were used as experimental models.Philips SPECT and Elscint dual headed SPECT were to measure the spectrum or to image the models under variable conditions.Results 89 Sr bremsstrahlung spectrum is a continuous curve,the main energy peak is about 79keV.When the energy window is properly broad,SPECT system fitted with pine hole,diverging,medium or high energy,parallel hole collimator can always produce ideal images that have both a higher signal noise ratio and a higher sensitivity.In addition,it is need to apply attenuation correction to the raw data.Conclusion It's practicable to image 89 Sr pure β emitter utilizing bremsstrahlung radiation. [