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題 名 | A Practical Background Correction Method for an Immediately Repeated First-pass Radionuclide Angiography |
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作 者 | Hu, Lien-hsin; Wu, Liang-chih; Lee, Chien-ying; Lin, Ko-han; Chu, Lee-shing; Liu, Ren-shyan; Huang, Wen-sheng; Chang, Cheng-pei; Huang, Wen-sheng; Lee, Chien-ying; Chu, Lee-shing; Hu, Lien-hsin; Chang, Cheng-pei; Liu, Ren-shyan; Lin, Ko-han; Wu, Liang-chih; | 書刊名 | Journal of the Chinese Medical Association |
卷 期 | 81:4 2018.04[民107.04] |
頁 次 | 頁331-339 |
分類號 | 414.93 |
關鍵詞 | Background correction; Background interference; Background subtraction; Ejection fraction; First-pass radionuclide angiography; Image processing; |
語 文 | 英文(English) |
英文摘要 | Background: A satisfactory bolus injection is essential for a successful first-pass radionuclide angiography (FPRNA). Rescheduling the FPRNA study is usually needed due to high background interference caused by an unsatisfactory bolus injection. We developed a protocol to correct the pre-existing background activity subsequent to immediately repeating the study. Methods: Seventy-four consecutive patients who had their bone scan and FPRNA scheduled on the same day were included for analysis. The initial 51 cases constituted the “validation-only” group. In the other 23 cases, the “validation plus clearance constants” group, a 5-min dynamic acquisition was performed during the 5-min equilibrium to obtain the background clearance curve and the clearance constants. For all included 74 cases ejection fraction (EF) analysis was proceeded using the images from the first injection, second injection, and second injection with the corrected background to yield EF1, EF2, and EF20 , respectively. EF2 and EF20 were then compared to the ejection fraction without background interference, the EF1. Results: For the LV, the mean difference between the EF1 and the uncorrected EF2 (jLVEF1-LVEF2j in mean ± SD) was 3.1 ± 2.0% and the difference between the EF1 and the corrected EF20 (jLVEF1-LVEF20 j) was 1.6 ± 2.1%, while the mean differences for RV are 2.2 ± 1.9% and 1.8 ± 1.8%, respectively. A significant difference ( p < 0.05) was observed between the uncorrected and the corrected data for both the LV and RV. Conclusion: In FPRNA, when a bolus injection is immediately readministered, both LVEF and RVEF can be underestimated. With our correction method, the results are superior to those without correction. |
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