@article{oai:kanazawa-u.repo.nii.ac.jp:00013121,
 author = {Onoguchi, Masahisa and Maruno, Hirotaka and Takayama, Teruhiko and Naoi, Yutaka and Irimoto, Masahiro and Maehara, Nobuyuki and Katayama, Hitoshi and Murata, Hajime},
 issue = {1},
 journal = {Journal of Nuclear Medicine Technology},
 month = {Jan},
 note = {Objective: The purpose of this work was to develop functional parameters to analyze regional cardiac function using ECG-gated 99mTc-tetrofosmin SPECT. Our goal was to develop a methodology that used slice thickness correction, the generation of a time-activity curve and a polar map. Methods: Fourteen normal patients without evidence of coronary artery disease were studied. One hour after intravenous injection of 740-1110 MBq (20-30 mCi) 99mTc-tetrofosmin, ECG-gated SPECT data were acquired by dividing a cardiac cycle into 12 frames. The SPECT data were reconstructed from 11 of 12 frames into 3 views. The reconstruction of these images was repeated after performing slice thickness correction. Excluding the effect of different apex-to-base lengths at any frame during a cardiac cycle, 10 short-axis images with the same slice thickness were obtained. Each short-axis image was divided by 40 radii into 40 segments. The time-activity curve was generated from the total counts included in each segment plus both neighboring segments. Subsequently the curve fitting was performed using the second Fourier function. Results: From fitted curves and their differentials, we calculated end-systolic count, end-diastolic count, percent count increase, uptake, peak contraction rate, peak distention rate and contraction time. Conclusion: The functional polar maps visually demonstrated regional myocardial function. This method is expected to be helpful for assessing regional cardiac function using 99mTc-tetrofosmin., 金沢大学大学院医学系研究科},
 pages = {29--35},
 title = {New functional polar maps for estimating regional cardiac function using ECG-gated technetium-99m-tetrofosmin SPECT},
 volume = {28},
 year = {2000}
}