Preliminary clinical results of photon energy recovery in simultaneous rest Tl-201/stress Tc-99m sestamibi myocardial SPECT

Background. The purpose of this study is to report the first clinical resul ts obtained with the spectral deconvolution technique photon energy recover y (PER) for crosstalk correction in simultaneous rest thallium 201/stress t echnetium 99m sestamibi myocardial perfusion single photon emission compute d tomography (SPECT), Methods and Results. Thirty-four patients with suspected coronary artery di sease received Tl-201 (111-130 MBq) at rest, followed by single SPECT, Tc-9 9m sestamibi (444-518 MBq) mas then injected at stress, followed by dual SP ECT. Single SPECT data were processed to obtain the following data sets: si ngle raw (conventional) Tl-201 and single PER (scatter-corrected) T1-201, D ual SPECT data were professed to obtain the following data sets: dual raw T l-201, dual PER (scatter- and crosstalk-corrected) T1-201, dual raw Tc-99m, and dual PER (scatter-corrected) Tc-99m, All. data sets were automatically analyzed with Cedars-Sinai Quantitative Perfusion SPECT software to derive the relative segmental uptake, the summed score, and the summed difference score. The relative segmental uptake, the summed score, and the number of patients with significant reversibility (summed difference score >2) were 7 4.84% +/- 12.79%, 3.44 +/- 3,07, and 13, respectively, for single raw Tk-20 1; 80.5% +/- 10.18%, 1.97 +/- 2,25, and 20, respectively, for dual raw Tl-2 01; 69.47% +/- 14.08%, 6.41 +/- 3,68, and 17, respectively, for single PER T1-201; and 69.99% +/- 13.39%, 6.58 +/- 3,63, and 17, respectively for dual PER T1-201, The differences between single and dual raw T1-201 data sets w ere highly significant, whereas there was no significant difference between PER-corrected Tl-201 data sets. Conclusions. PER is quantitatively efficient to correct for crosstalk in pa tients investigated with simultaneous rest Tl-201/stress Tc-99m sestamibi m yocardial SPECT.