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Wan Fiona Fong-ying,Yeung Catherine Ming-mun,Yam Pak-ki,Ng Pan Pan,Chow Boris Chun Kei,Chiang Jeanie Betsy,Lee Jonan Chun-yin,Cheung Kenneth Kai-yat,Ng Ming-yen 아시아심장혈관영상의학회 2022 Cardiovascular Imaging Asia Vol.6 No.3
Objective:Splenic switch-off (SSO) sign has been utilized as a surrogate marker of adequate stress but can only be assessed after first-pass perfusion imaging. A study previously reported that drop in T1spleen ≥30 ms during adenosine infusion predicts presence of SSO, but this finding has not been externally validated. This study aimed to prospectively validate whether drop in T1spleen ≥30 ms is a reliable marker of SSO and hence adequate stress, and to assess reproducibility of T1spleen measurements. Materials and Methods: Data of fifty consecutive patients undergoing stress cardiac magnetic resonance were prospectively collected. Native T1-maps were acquired at rest and at 2.5 min after adenosine infusion in short axis slices, followed by perfusion images at 3 min. To measure T1spleen pre- and post-adenosine infusion, regions of interest were manually placed to include most splenic tissue. Adenosine stress adequacy was evaluated by visual SSO assessment and semi-quantitative splenic perfusion analysis. Results:A significant association was found between a drop in T1spleen of ≥30 ms and SSO response (p<0.001). There was excellent correlation between SSO response and semiquantitative perfusion change in spleen (rho=0.847, p<0.001). Inter-observer and intra-observer agreement for measurement of ΔT1spleen values were excellent, with intra-class correlation coefficients of 0.987 and 0.995, respectively. By receiver-operating characteristic analysis, the optimal cut-off value of ΔT1spleen for predicting presence of SSO was -28 ms, with area under the curve=0.76 (p=0.002). Conclusion:Splenic T1-mapping is accurate and reproducible for predicting SSO, potentially allowing optimization of adenosine dosage for adequate stress.
Nuclear Theranostics in Taiwan
Ko-Han Lin,Yi-Wei Chen,Rheun-Chuan Lee,Ling-Wei Wang,Fong-In Chou,Chi-Wei Chang,Sang-Hue Yen,Wen-Sheng Huang 대한핵의학회 2019 핵의학 분자영상 Vol.53 No.2
Boron neutron capture therapy and Y-90 radioembolization are emerging therapeutic methods for uncontrolled brain cancers and hepatic cancers, respectively. These advanced radiation therapies are heavily relied on theranostic nuclear medicine imaging before the therapy for the eligibility of patients and the prescribed-dose simulation, as well as the post-therapy scanning for assessing the treatment efficacy. In Taiwan, the Taipei Veterans General Hospital is the only institute performing the BNCT and also the leading institute performing Y-90 radioembolization. In this article, we present our single institute experiences and associated theranostic nuclear medicine approaches for these therapies.