Tlー201心筋SPECTにおける吸収・散乱補正法の検討

概要

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In the quantitative analysis of SPECT images, it is necessary to correct for attenuation, scatter, and partial volume effect. Attenuation correction of a non-uniform body was possible with a simultaneous transmission-emission protocol(STEP). Scatter correction was also possible with the triple energy window(TEW) method. We evaluated the quantitative distribution of a Pei phantom and a cardiac-thoracic phantom using STEP and the TEW method. This system consists of a Tc-99m line source assembly and triple-head SPECT system(PRISM3000, Picker Int.) with cardio fan beam collimators. The uniformity of the tracer distribution on a Bull's-eye map was quantitatively evaluated as C.V. value in non-correction, STEP, and the combined correction protocol. Without activity in the liver, the C.V. value was improved from 8.9% to 5.58% with STEP. When liver activity was set beneath the cardiac phantom, the activity was not uniform with STEP, but it became uniform with the combined correction protocol. In conclusion, accurate correction of attenuation and scatter can be performed with the combined correction protocol. This protocol holds promise for the quantitative measurement of tracer concentration on SPECT images.
公益社団法人日本放射線技術学会の論文
1998-05-20