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Yothin Rakvongthai - One of the best experts on this subject based on the ideXlab platform.
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Impact of Injection Time on migration of SPECT seizure onset in temporal lobe epilepsy
2017 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2017Co-Authors: Saranya Ramchuankiat, Pisit Jarumaneeroj, Chusak Limotai, Supatporn Tepmongkol, Yothin RakvongthaiAbstract:In this work, we investigated an impact of Injection Time on migration of seizure-onset in ictal/interictal single photon emission computed tomography (SPECT) study for patients with temporal lobe epilepsy. We selected 33 patients with refractory temporal lobe epilepsy who underwent ictal/interictal SPECT studies and had preoperative intracranial EEG result or surgical resection which was used as reference for seizure location. We divided all patients into two groups, which are the fast and the delayed groups; the delayed group comprised patients with Injection Time more than a cutoff Time and vice versa. Using the subtraction ictal-interictal SPECT co-registered with SPECT (SISCOS) with varied Z-threshold (1.0, 1.5, 2.0 and 2.5), a method similar to subtraction ictal SPECT co-registered to magnetic resonance imaging (MRI) (SISCOM), a seizure-onset region in the SISCOS image was localized at the region with maximum sum of Z-scores. For each pair of cutoff Time and Z-threshold, we determined the migratory proportion which was defined as the proportion of patients whose seizure-onset location based on SISCOS image was discordant with the reference. At cutoff Time of 32-35 seconds and the Z-threshold of 2.0, the migratory proportion values were 7/26 (26.9%) and 5/7 (71.4%) in the fast and the delayed groups, respectively. At the same range of cutoff Time with the Z-threshold of 2.5, the migratory proportion was 8/26 (30.8%) in the fast group while the proportion was 5/7 (71.4%) in the delayed group. Using Fisher's exact test, the migratory proportion values at the Z-threshold of 2.0 and 2.5 were significantly different between the fast and the delayed groups (p = 0.0709 and 0.0838, respectively), suggesting that patients with temporal lobe epilepsy who undergo an ictal/interictal SPECT study with Injection Time longer than 35 seconds tend to have seizure-onset zone migration in the SISCOS analysis with the traditionally-used Z-threshold of 2.0.
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EMBC - Impact of Injection Time on migration of SPECT seizure onset in temporal lobe epilepsy
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and, 2017Co-Authors: Saranya Ramchuankiat, Pisit Jarumaneeroj, Chusak Limotai, Supatporn Tepmongkol, Yothin RakvongthaiAbstract:In this work, we investigated an impact of Injection Time on migration of seizure-onset in ictal/interictal single photon emission computed tomography (SPECT) study for patients with temporal lobe epilepsy. We selected 33 patients with refractory temporal lobe epilepsy who underwent ictal/interictal SPECT studies and had preoperative intracranial EEG result or surgical resection which was used as reference for seizure location. We divided all patients into two groups, which are the fast and the delayed groups; the delayed group comprised patients with Injection Time more than a cutoff Time and vice versa. Using the subtraction ictal-interictal SPECT co-registered with SPECT (SISCOS) with varied Z-threshold (1.0, 1.5, 2.0 and 2.5), a method similar to subtraction ictal SPECT co-registered to magnetic resonance imaging (MRI) (SISCOM), a seizure-onset region in the SISCOS image was localized at the region with maximum sum of Z-scores. For each pair of cutoff Time and Z-threshold, we determined the migratory proportion which was defined as the proportion of patients whose seizure-onset location based on SISCOS image was discordant with the reference. At cutoff Time of 32–35 seconds and the Z-threshold of 2.0, the migratory proportion values were 7/26 (26.9%) and 5/7 (71.4%) in the fast and the delayed groups, respectively. At the same range of cutoff Time with the Z-threshold of 2.5, the migratory proportion was 8/26 (30.8%) in the fast group while the proportion was 5/7 (71.4%) in the delayed group. Using Fisher's exact test, the migratory proportion values at the Z-threshold of 2.0 and 2.5 were significantly different between the fast and the delayed groups (p = 0.0709 and 0.0838, respectively), suggesting that patients with temporal lobe epilepsy who undergo an ictal/interictal SPECT study with Injection Time longer than 35 seconds tend to have seizure-onset zone migration in the SISCOS analysis with the traditionally-used Z-threshold of 2.0.
Paul A. Cooper - One of the best experts on this subject based on the ideXlab platform.
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The effects of composition and carbon dioxide Injection Time on the properties of wood-cement composites
Holz als Roh- und Werkstoff, 2007Co-Authors: Hucheng Qi, Paul A. CooperAbstract:ZusammenfassungDer Einfluss der Holzfaser/Zement- und Wasser/Zement-Verhältnisse sowie der Dauer einer Kohlenstoffdioxid-Begasung auf die Karbonisierungsreaktion und die Festigkeit von Holz-Zement-Werkstoffen wurden untersucht. In der Regel führte ein höherer Fasergehalt zu Werkstoffen mit einer höheren Festigkeit und einem niedrigeren Karbonisierungsgrad, wohingegen ein höherer Wassergehalt in den meisten Fällen die Festigkeit der Werkstoffe reduzierte. Zu wenig oder zu viel Wasser verlangsamten die Karbonisierungsreaktion. Es wurde eine erhebliche Wechselwirkung zwischen Faser- und Wassergehalt festgestellt, die bei der Optimierung der Variablen beachtet werden musste. Eine längere Kohlenstoffdioxid-Begasungsdauer erhöhte den Karbonisierungsgrad, wirkte sich auf die Festigkeit der Werkstoffe jedoch nicht aus. Die Prozessoptimierung wurde im Hinblick auf die Wirkung der betrachteten Variablen auf die Festigkeit der Werkstoffe durchgeführt. In einem Überprüfungsversuch wurde die geschätzte optimale Festigkeit näherungsweise erreicht. Karbonisierte Holz-Zement-Werkstoffe erzielten in konventionellen und beschleunigten Alterungsprüfungen wesentlich bessere Ergebnisse als nicht karbonisierte Werkstoffe.AbstractThe effects of wood fiber/cement ratio, water/cement ratio and carbon dioxide Injection Time on the carbonation reaction and strength of wood-cement composites were evaluated. Increasing fiber content usually led to stronger composites and lower carbonation degree while increasing water amount decreased strength of composites in most cases. Either insufficient water or excessive water reduced carbonation reaction rate. There was a significant interaction effect between fiber content and water content, which had to be considered in optimizing the variables. Prolonging carbon dioxide Injection Time gradually increased carbonation degree, but did not affect the ultimate strength of composites. Process optimization was conducted according to the effects of the considered variables on the strength of composites. The validation experiment confirmed that the estimated optimal strength could be approximately obtained. Carbonated wood-cement composites performed much better than uncarbonated ones in conventional and accelerated ageing tests.
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The effects of composition and carbon dioxide Injection Time on the properties of wood-cement composites
Holz als Roh- und Werkstoff, 2007Co-Authors: Hucheng Qi, Paul A. CooperAbstract:Der Einfluss der Holzfaser/Zement- und Wasser/Zement-Verhältnisse sowie der Dauer einer Kohlenstoffdioxid-Begasung auf die Karbonisierungsreaktion und die Festigkeit von Holz-Zement-Werkstoffen wurden untersucht. In der Regel führte ein höherer Fasergehalt zu Werkstoffen mit einer höheren Festigkeit und einem niedrigeren Karbonisierungsgrad, wohingegen ein höherer Wassergehalt in den meisten Fällen die Festigkeit der Werkstoffe reduzierte. Zu wenig oder zu viel Wasser verlangsamten die Karbonisierungsreaktion. Es wurde eine erhebliche Wechselwirkung zwischen Faser- und Wassergehalt festgestellt, die bei der Optimierung der Variablen beachtet werden musste. Eine längere Kohlenstoffdioxid-Begasungsdauer erhöhte den Karbonisierungsgrad, wirkte sich auf die Festigkeit der Werkstoffe jedoch nicht aus. Die Prozessoptimierung wurde im Hinblick auf die Wirkung der betrachteten Variablen auf die Festigkeit der Werkstoffe durchgeführt. In einem Überprüfungsversuch wurde die geschätzte optimale Festigkeit näherungsweise erreicht. Karbonisierte Holz-Zement-Werkstoffe erzielten in konventionellen und beschleunigten Alterungsprüfungen wesentlich bessere Ergebnisse als nicht karbonisierte Werkstoffe. The effects of wood fiber/cement ratio, water/cement ratio and carbon dioxide Injection Time on the carbonation reaction and strength of wood-cement composites were evaluated. Increasing fiber content usually led to stronger composites and lower carbonation degree while increasing water amount decreased strength of composites in most cases. Either insufficient water or excessive water reduced carbonation reaction rate. There was a significant interaction effect between fiber content and water content, which had to be considered in optimizing the variables. Prolonging carbon dioxide Injection Time gradually increased carbonation degree, but did not affect the ultimate strength of composites. Process optimization was conducted according to the effects of the considered variables on the strength of composites. The validation experiment confirmed that the estimated optimal strength could be approximately obtained. Carbonated wood-cement composites performed much better than uncarbonated ones in conventional and accelerated ageing tests.
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The effects of composition and carbon dioxide Injection Time on the properties of wood-cement composites
European Journal of Wood and Wood Products, 2006Co-Authors: Hucheng Qi, Paul A. CooperAbstract:The effects of wood fiber/cement ratio, water/cement ratio and carbon dioxide Injection Time on the carbonation reaction and strength of wood-cement composites were evaluated. Increasing fiber content usually led to stronger composites and lower carbonation degree while increasing water amount decreased strength of composites in most cases. Either insufficient water or excessive water reduced carbonation reaction rate. There was a significant interaction effect between fiber content and water content, which had to be considered in optimizing the variables. Prolonging carbon dioxide Injection Time gradually increased carbonation degree, but did not affect the ultimate strength of composites.
Saranya Ramchuankiat - One of the best experts on this subject based on the ideXlab platform.
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Impact of Injection Time on migration of SPECT seizure onset in temporal lobe epilepsy
2017 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2017Co-Authors: Saranya Ramchuankiat, Pisit Jarumaneeroj, Chusak Limotai, Supatporn Tepmongkol, Yothin RakvongthaiAbstract:In this work, we investigated an impact of Injection Time on migration of seizure-onset in ictal/interictal single photon emission computed tomography (SPECT) study for patients with temporal lobe epilepsy. We selected 33 patients with refractory temporal lobe epilepsy who underwent ictal/interictal SPECT studies and had preoperative intracranial EEG result or surgical resection which was used as reference for seizure location. We divided all patients into two groups, which are the fast and the delayed groups; the delayed group comprised patients with Injection Time more than a cutoff Time and vice versa. Using the subtraction ictal-interictal SPECT co-registered with SPECT (SISCOS) with varied Z-threshold (1.0, 1.5, 2.0 and 2.5), a method similar to subtraction ictal SPECT co-registered to magnetic resonance imaging (MRI) (SISCOM), a seizure-onset region in the SISCOS image was localized at the region with maximum sum of Z-scores. For each pair of cutoff Time and Z-threshold, we determined the migratory proportion which was defined as the proportion of patients whose seizure-onset location based on SISCOS image was discordant with the reference. At cutoff Time of 32-35 seconds and the Z-threshold of 2.0, the migratory proportion values were 7/26 (26.9%) and 5/7 (71.4%) in the fast and the delayed groups, respectively. At the same range of cutoff Time with the Z-threshold of 2.5, the migratory proportion was 8/26 (30.8%) in the fast group while the proportion was 5/7 (71.4%) in the delayed group. Using Fisher's exact test, the migratory proportion values at the Z-threshold of 2.0 and 2.5 were significantly different between the fast and the delayed groups (p = 0.0709 and 0.0838, respectively), suggesting that patients with temporal lobe epilepsy who undergo an ictal/interictal SPECT study with Injection Time longer than 35 seconds tend to have seizure-onset zone migration in the SISCOS analysis with the traditionally-used Z-threshold of 2.0.
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EMBC - Impact of Injection Time on migration of SPECT seizure onset in temporal lobe epilepsy
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and, 2017Co-Authors: Saranya Ramchuankiat, Pisit Jarumaneeroj, Chusak Limotai, Supatporn Tepmongkol, Yothin RakvongthaiAbstract:In this work, we investigated an impact of Injection Time on migration of seizure-onset in ictal/interictal single photon emission computed tomography (SPECT) study for patients with temporal lobe epilepsy. We selected 33 patients with refractory temporal lobe epilepsy who underwent ictal/interictal SPECT studies and had preoperative intracranial EEG result or surgical resection which was used as reference for seizure location. We divided all patients into two groups, which are the fast and the delayed groups; the delayed group comprised patients with Injection Time more than a cutoff Time and vice versa. Using the subtraction ictal-interictal SPECT co-registered with SPECT (SISCOS) with varied Z-threshold (1.0, 1.5, 2.0 and 2.5), a method similar to subtraction ictal SPECT co-registered to magnetic resonance imaging (MRI) (SISCOM), a seizure-onset region in the SISCOS image was localized at the region with maximum sum of Z-scores. For each pair of cutoff Time and Z-threshold, we determined the migratory proportion which was defined as the proportion of patients whose seizure-onset location based on SISCOS image was discordant with the reference. At cutoff Time of 32–35 seconds and the Z-threshold of 2.0, the migratory proportion values were 7/26 (26.9%) and 5/7 (71.4%) in the fast and the delayed groups, respectively. At the same range of cutoff Time with the Z-threshold of 2.5, the migratory proportion was 8/26 (30.8%) in the fast group while the proportion was 5/7 (71.4%) in the delayed group. Using Fisher's exact test, the migratory proportion values at the Z-threshold of 2.0 and 2.5 were significantly different between the fast and the delayed groups (p = 0.0709 and 0.0838, respectively), suggesting that patients with temporal lobe epilepsy who undergo an ictal/interictal SPECT study with Injection Time longer than 35 seconds tend to have seizure-onset zone migration in the SISCOS analysis with the traditionally-used Z-threshold of 2.0.
Hucheng Qi - One of the best experts on this subject based on the ideXlab platform.
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The effects of composition and carbon dioxide Injection Time on the properties of wood-cement composites
Holz als Roh- und Werkstoff, 2007Co-Authors: Hucheng Qi, Paul A. CooperAbstract:ZusammenfassungDer Einfluss der Holzfaser/Zement- und Wasser/Zement-Verhältnisse sowie der Dauer einer Kohlenstoffdioxid-Begasung auf die Karbonisierungsreaktion und die Festigkeit von Holz-Zement-Werkstoffen wurden untersucht. In der Regel führte ein höherer Fasergehalt zu Werkstoffen mit einer höheren Festigkeit und einem niedrigeren Karbonisierungsgrad, wohingegen ein höherer Wassergehalt in den meisten Fällen die Festigkeit der Werkstoffe reduzierte. Zu wenig oder zu viel Wasser verlangsamten die Karbonisierungsreaktion. Es wurde eine erhebliche Wechselwirkung zwischen Faser- und Wassergehalt festgestellt, die bei der Optimierung der Variablen beachtet werden musste. Eine längere Kohlenstoffdioxid-Begasungsdauer erhöhte den Karbonisierungsgrad, wirkte sich auf die Festigkeit der Werkstoffe jedoch nicht aus. Die Prozessoptimierung wurde im Hinblick auf die Wirkung der betrachteten Variablen auf die Festigkeit der Werkstoffe durchgeführt. In einem Überprüfungsversuch wurde die geschätzte optimale Festigkeit näherungsweise erreicht. Karbonisierte Holz-Zement-Werkstoffe erzielten in konventionellen und beschleunigten Alterungsprüfungen wesentlich bessere Ergebnisse als nicht karbonisierte Werkstoffe.AbstractThe effects of wood fiber/cement ratio, water/cement ratio and carbon dioxide Injection Time on the carbonation reaction and strength of wood-cement composites were evaluated. Increasing fiber content usually led to stronger composites and lower carbonation degree while increasing water amount decreased strength of composites in most cases. Either insufficient water or excessive water reduced carbonation reaction rate. There was a significant interaction effect between fiber content and water content, which had to be considered in optimizing the variables. Prolonging carbon dioxide Injection Time gradually increased carbonation degree, but did not affect the ultimate strength of composites. Process optimization was conducted according to the effects of the considered variables on the strength of composites. The validation experiment confirmed that the estimated optimal strength could be approximately obtained. Carbonated wood-cement composites performed much better than uncarbonated ones in conventional and accelerated ageing tests.
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The effects of composition and carbon dioxide Injection Time on the properties of wood-cement composites
Holz als Roh- und Werkstoff, 2007Co-Authors: Hucheng Qi, Paul A. CooperAbstract:Der Einfluss der Holzfaser/Zement- und Wasser/Zement-Verhältnisse sowie der Dauer einer Kohlenstoffdioxid-Begasung auf die Karbonisierungsreaktion und die Festigkeit von Holz-Zement-Werkstoffen wurden untersucht. In der Regel führte ein höherer Fasergehalt zu Werkstoffen mit einer höheren Festigkeit und einem niedrigeren Karbonisierungsgrad, wohingegen ein höherer Wassergehalt in den meisten Fällen die Festigkeit der Werkstoffe reduzierte. Zu wenig oder zu viel Wasser verlangsamten die Karbonisierungsreaktion. Es wurde eine erhebliche Wechselwirkung zwischen Faser- und Wassergehalt festgestellt, die bei der Optimierung der Variablen beachtet werden musste. Eine längere Kohlenstoffdioxid-Begasungsdauer erhöhte den Karbonisierungsgrad, wirkte sich auf die Festigkeit der Werkstoffe jedoch nicht aus. Die Prozessoptimierung wurde im Hinblick auf die Wirkung der betrachteten Variablen auf die Festigkeit der Werkstoffe durchgeführt. In einem Überprüfungsversuch wurde die geschätzte optimale Festigkeit näherungsweise erreicht. Karbonisierte Holz-Zement-Werkstoffe erzielten in konventionellen und beschleunigten Alterungsprüfungen wesentlich bessere Ergebnisse als nicht karbonisierte Werkstoffe. The effects of wood fiber/cement ratio, water/cement ratio and carbon dioxide Injection Time on the carbonation reaction and strength of wood-cement composites were evaluated. Increasing fiber content usually led to stronger composites and lower carbonation degree while increasing water amount decreased strength of composites in most cases. Either insufficient water or excessive water reduced carbonation reaction rate. There was a significant interaction effect between fiber content and water content, which had to be considered in optimizing the variables. Prolonging carbon dioxide Injection Time gradually increased carbonation degree, but did not affect the ultimate strength of composites. Process optimization was conducted according to the effects of the considered variables on the strength of composites. The validation experiment confirmed that the estimated optimal strength could be approximately obtained. Carbonated wood-cement composites performed much better than uncarbonated ones in conventional and accelerated ageing tests.
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The effects of composition and carbon dioxide Injection Time on the properties of wood-cement composites
European Journal of Wood and Wood Products, 2006Co-Authors: Hucheng Qi, Paul A. CooperAbstract:The effects of wood fiber/cement ratio, water/cement ratio and carbon dioxide Injection Time on the carbonation reaction and strength of wood-cement composites were evaluated. Increasing fiber content usually led to stronger composites and lower carbonation degree while increasing water amount decreased strength of composites in most cases. Either insufficient water or excessive water reduced carbonation reaction rate. There was a significant interaction effect between fiber content and water content, which had to be considered in optimizing the variables. Prolonging carbon dioxide Injection Time gradually increased carbonation degree, but did not affect the ultimate strength of composites.
Supatporn Tepmongkol - One of the best experts on this subject based on the ideXlab platform.
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Impact of Injection Time on migration of SPECT seizure onset in temporal lobe epilepsy
2017 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2017Co-Authors: Saranya Ramchuankiat, Pisit Jarumaneeroj, Chusak Limotai, Supatporn Tepmongkol, Yothin RakvongthaiAbstract:In this work, we investigated an impact of Injection Time on migration of seizure-onset in ictal/interictal single photon emission computed tomography (SPECT) study for patients with temporal lobe epilepsy. We selected 33 patients with refractory temporal lobe epilepsy who underwent ictal/interictal SPECT studies and had preoperative intracranial EEG result or surgical resection which was used as reference for seizure location. We divided all patients into two groups, which are the fast and the delayed groups; the delayed group comprised patients with Injection Time more than a cutoff Time and vice versa. Using the subtraction ictal-interictal SPECT co-registered with SPECT (SISCOS) with varied Z-threshold (1.0, 1.5, 2.0 and 2.5), a method similar to subtraction ictal SPECT co-registered to magnetic resonance imaging (MRI) (SISCOM), a seizure-onset region in the SISCOS image was localized at the region with maximum sum of Z-scores. For each pair of cutoff Time and Z-threshold, we determined the migratory proportion which was defined as the proportion of patients whose seizure-onset location based on SISCOS image was discordant with the reference. At cutoff Time of 32-35 seconds and the Z-threshold of 2.0, the migratory proportion values were 7/26 (26.9%) and 5/7 (71.4%) in the fast and the delayed groups, respectively. At the same range of cutoff Time with the Z-threshold of 2.5, the migratory proportion was 8/26 (30.8%) in the fast group while the proportion was 5/7 (71.4%) in the delayed group. Using Fisher's exact test, the migratory proportion values at the Z-threshold of 2.0 and 2.5 were significantly different between the fast and the delayed groups (p = 0.0709 and 0.0838, respectively), suggesting that patients with temporal lobe epilepsy who undergo an ictal/interictal SPECT study with Injection Time longer than 35 seconds tend to have seizure-onset zone migration in the SISCOS analysis with the traditionally-used Z-threshold of 2.0.
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EMBC - Impact of Injection Time on migration of SPECT seizure onset in temporal lobe epilepsy
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and, 2017Co-Authors: Saranya Ramchuankiat, Pisit Jarumaneeroj, Chusak Limotai, Supatporn Tepmongkol, Yothin RakvongthaiAbstract:In this work, we investigated an impact of Injection Time on migration of seizure-onset in ictal/interictal single photon emission computed tomography (SPECT) study for patients with temporal lobe epilepsy. We selected 33 patients with refractory temporal lobe epilepsy who underwent ictal/interictal SPECT studies and had preoperative intracranial EEG result or surgical resection which was used as reference for seizure location. We divided all patients into two groups, which are the fast and the delayed groups; the delayed group comprised patients with Injection Time more than a cutoff Time and vice versa. Using the subtraction ictal-interictal SPECT co-registered with SPECT (SISCOS) with varied Z-threshold (1.0, 1.5, 2.0 and 2.5), a method similar to subtraction ictal SPECT co-registered to magnetic resonance imaging (MRI) (SISCOM), a seizure-onset region in the SISCOS image was localized at the region with maximum sum of Z-scores. For each pair of cutoff Time and Z-threshold, we determined the migratory proportion which was defined as the proportion of patients whose seizure-onset location based on SISCOS image was discordant with the reference. At cutoff Time of 32–35 seconds and the Z-threshold of 2.0, the migratory proportion values were 7/26 (26.9%) and 5/7 (71.4%) in the fast and the delayed groups, respectively. At the same range of cutoff Time with the Z-threshold of 2.5, the migratory proportion was 8/26 (30.8%) in the fast group while the proportion was 5/7 (71.4%) in the delayed group. Using Fisher's exact test, the migratory proportion values at the Z-threshold of 2.0 and 2.5 were significantly different between the fast and the delayed groups (p = 0.0709 and 0.0838, respectively), suggesting that patients with temporal lobe epilepsy who undergo an ictal/interictal SPECT study with Injection Time longer than 35 seconds tend to have seizure-onset zone migration in the SISCOS analysis with the traditionally-used Z-threshold of 2.0.