2026-03-07T08:29:00Z https://kanazawa-u.repo.nii.ac.jp/oai

oai:kanazawa-u.repo.nii.ac.jp:00012939 2024-06-20T07:22:29Z 1132:1133:1134

New functional polar maps for estimating regional cardiac function using ECG-gated technetium-99m-tetrofosmin SPECT Onoguchi, Masahisa Maruno, Hirotaka 20171556 Takayama, Teruhiko Naoi, Yutaka Irimoto, Masahiro Maehara, Nobuyuki Katayama, Hitoshi Murata, Hajime 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量子医療技術学 Society of Nuclear Medicine 2000-03-01 2017-10-03 eng journal article VoR http://hdl.handle.net/2297/6999 https://kanazawa-u.repo.nii.ac.jp/records/12939 http://tech.snmjournals.org/cgi/content/short/28/1/29 0091-4916 Journal of Nuclear Medicine Technology 28 1 29 35 https://kanazawa-u.repo.nii.ac.jp/record/12939/files/ME-PR-ONOGUCHI-M-29.pdf application/pdf 393.4 kB 2017-10-03