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Altered carotid plaque signal among different repetition times on T1-weighted magnetic resonance plaque imaging with self-navigated radial-scan technique.(Report)

Byline: Shinsuke Narumi (1), Makoto Sasaki (2), Hideki Ohba (1), Kuniaki Ogasawara (3), Jiro Hitomi (4), Kiyofumi Mori (1), Kazumasa Ohura (1), Ayumi Ono (1), Yasuo Terayama (1) Keywords: Carotid stenosis; Magnetic resonance imaging; Plaque imaging; Repetition time Abstract: Introduction Magnetic re... Full description

Journal Title: Neuroradiology April, 2010, Vol.52(4), p.285(6)
Main Author: Narumi, Shinsuke
Other Authors: Sasaki, Makoto , Ohba, Hideki , Ogasawara, Kuniaki , Hitomi, Jiro , Mori, Kiyofumi , Ohura, Kazumasa , Ono, Ayumi , Terayama, Yasuo
Format: Electronic Article Electronic Article
Language: English
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ID: ISSN: 0028-3940
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title: Altered carotid plaque signal among different repetition times on T1-weighted magnetic resonance plaque imaging with self-navigated radial-scan technique.(Report)
format: Article
creator:
  • Narumi, Shinsuke
  • Sasaki, Makoto
  • Ohba, Hideki
  • Ogasawara, Kuniaki
  • Hitomi, Jiro
  • Mori, Kiyofumi
  • Ohura, Kazumasa
  • Ono, Ayumi
  • Terayama, Yasuo
subjects:
  • Diagnostic Imaging -- Methods
ispartof: Neuroradiology, April, 2010, Vol.52(4), p.285(6)
description: Byline: Shinsuke Narumi (1), Makoto Sasaki (2), Hideki Ohba (1), Kuniaki Ogasawara (3), Jiro Hitomi (4), Kiyofumi Mori (1), Kazumasa Ohura (1), Ayumi Ono (1), Yasuo Terayama (1) Keywords: Carotid stenosis; Magnetic resonance imaging; Plaque imaging; Repetition time Abstract: Introduction Magnetic resonance (MR) plaque imaging for carotid arteries is usually performed by using an electrocardiograph (ECG)-gating technique to eliminate pulsation-related artifacts, which can affect the plaque signals because of varied repetition time (TR) among patients. Hence, we investigated whether differences in TR causes signal alterations of the carotid plaque by using a non-gated plaque imaging technique. Methods We prospectively examined 19 patients with carotid stenosis by using a T1-weighted self-navigated radial-scan technique with TRs of 500, 700, and 900 ms. The signal intensity of the carotid plaque was measured, and the contrast ratio (CR) relative to the adjacent muscle was calculated. Results CRs of the carotid plaques were 1.39+-0.39, 1.29+-0.29, and 1.23+-0.24 with TRs of 500, 700, and 900 ms, respectively, and were significantly different. Among the plaques, those with a hyperintensity signal (CR>1.5) and moderate-intensity signal (CR 1.2--1.5) at 500 ms showed a TR-dependent signal decrease (hyperintensity plaques, 1.82+-0.26 1.61+-0.19 and 1.48+-0.17 moderate-intensity plaques, 1.33+-0.08 1.26+-0.08 and 1.19+-0.07), while those with an isointensity signal (CR
language: English
source:
identifier: ISSN: 0028-3940
fulltext: fulltext
issn:
  • 0028-3940
  • 00283940
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titleAltered carotid plaque signal among different repetition times on T1-weighted magnetic resonance plaque imaging with self-navigated radial-scan technique.(Report)
creatorNarumi, Shinsuke ; Sasaki, Makoto ; Ohba, Hideki ; Ogasawara, Kuniaki ; Hitomi, Jiro ; Mori, Kiyofumi ; Ohura, Kazumasa ; Ono, Ayumi ; Terayama, Yasuo
ispartofNeuroradiology, April, 2010, Vol.52(4), p.285(6)
identifierISSN: 0028-3940
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descriptionByline: Shinsuke Narumi (1), Makoto Sasaki (2), Hideki Ohba (1), Kuniaki Ogasawara (3), Jiro Hitomi (4), Kiyofumi Mori (1), Kazumasa Ohura (1), Ayumi Ono (1), Yasuo Terayama (1) Keywords: Carotid stenosis; Magnetic resonance imaging; Plaque imaging; Repetition time Abstract: Introduction Magnetic resonance (MR) plaque imaging for carotid arteries is usually performed by using an electrocardiograph (ECG)-gating technique to eliminate pulsation-related artifacts, which can affect the plaque signals because of varied repetition time (TR) among patients. Hence, we investigated whether differences in TR causes signal alterations of the carotid plaque by using a non-gated plaque imaging technique. Methods We prospectively examined 19 patients with carotid stenosis by using a T1-weighted self-navigated radial-scan technique with TRs of 500, 700, and 900 ms. The signal intensity of the carotid plaque was measured, and the contrast ratio (CR) relative to the adjacent muscle was calculated. Results CRs of the carotid plaques were 1.39+-0.39, 1.29+-0.29, and 1.23+-0.24 with TRs of 500, 700, and 900 ms, respectively, and were significantly different. Among the plaques, those with a hyperintensity signal (CR>1.5) and moderate-intensity signal (CR 1.2--1.5) at 500 ms showed a TR-dependent signal decrease (hyperintensity plaques, 1.82+-0.26 1.61+-0.19 and 1.48+-0.17 moderate-intensity plaques, 1.33+-0.08 1.26+-0.08 and 1.19+-0.07), while those with an isointensity signal (CR<1.2) remained unchanged regardless of TR (0.96+-0.12, 0.96+-0.11, and 0.97+-0.13). Conclusion The signal intensity of the carotid plaque on T1-weighted imaging significantly varies among different TRs and tends to decrease with longer TR. MR plaque imaging with short and constant TR settings that the ECG-gating method cannot realize would be preferable for evaluating plaque characteristics. Author Affiliation: (1) Department of Neurology and Gerontology, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan (2) Advanced Medical Research Center, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan (3) Department of Neurosurgery, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan (4) Department of Anatomy, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan Article History: Registration Date: 25/11/2009 Received Date: 02/11/2009 Accepted Date: 25/11/2009 Online Date: 18/12/2009
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titleAltered carotid plaque signal among different repetition times on T1-weighted magnetic resonance plaque imaging with self-navigated radial-scan technique.(Report)
descriptionByline: Shinsuke Narumi (1), Makoto Sasaki (2), Hideki Ohba (1), Kuniaki Ogasawara (3), Jiro Hitomi (4), Kiyofumi Mori (1), Kazumasa Ohura (1), Ayumi Ono (1), Yasuo Terayama (1) Keywords: Carotid stenosis; Magnetic resonance imaging; Plaque imaging; Repetition time Abstract: Introduction Magnetic resonance (MR) plaque imaging for carotid arteries is usually performed by using an electrocardiograph (ECG)-gating technique to eliminate pulsation-related artifacts, which can affect the plaque signals because of varied repetition time (TR) among patients. Hence, we investigated whether differences in TR causes signal alterations of the carotid plaque by using a non-gated plaque imaging technique. Methods We prospectively examined 19 patients with carotid stenosis by using a T1-weighted self-navigated radial-scan technique with TRs of 500, 700, and 900 ms. The signal intensity of the carotid plaque was measured, and the contrast ratio (CR) relative to the adjacent muscle was calculated. Results CRs of the carotid plaques were 1.39+-0.39, 1.29+-0.29, and 1.23+-0.24 with TRs of 500, 700, and 900 ms, respectively, and were significantly different. Among the plaques, those with a hyperintensity signal (CR>1.5) and moderate-intensity signal (CR 1.2--1.5) at 500 ms showed a TR-dependent signal decrease (hyperintensity plaques, 1.82+-0.26 1.61+-0.19 and 1.48+-0.17 moderate-intensity plaques, 1.33+-0.08 1.26+-0.08 and 1.19+-0.07), while those with an isointensity signal (CR<1.2) remained unchanged regardless of TR (0.96+-0.12, 0.96+-0.11, and 0.97+-0.13). Conclusion The signal intensity of the carotid plaque on T1-weighted imaging significantly varies among different TRs and tends to decrease with longer TR. MR plaque imaging with short and constant TR settings that the ECG-gating method cannot realize would be preferable for evaluating plaque characteristics. Author Affiliation: (1) Department of Neurology and Gerontology, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan (2) Advanced Medical Research Center, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan (3) Department of Neurosurgery, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan (4) Department of Anatomy, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan Article History: Registration Date: 25/11/2009 Received Date: 02/11/2009 Accepted Date: 25/11/2009 Online Date: 18/12/2009
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titleAltered carotid plaque signal among different repetition times on T1-weighted magnetic resonance plaque imaging with self-navigated radial-scan technique.(Report)
authorNarumi, Shinsuke ; Sasaki, Makoto ; Ohba, Hideki ; Ogasawara, Kuniaki ; Hitomi, Jiro ; Mori, Kiyofumi ; Ohura, Kazumasa ; Ono, Ayumi ; Terayama, Yasuo
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abstractByline: Shinsuke Narumi (1), Makoto Sasaki (2), Hideki Ohba (1), Kuniaki Ogasawara (3), Jiro Hitomi (4), Kiyofumi Mori (1), Kazumasa Ohura (1), Ayumi Ono (1), Yasuo Terayama (1) Keywords: Carotid stenosis; Magnetic resonance imaging; Plaque imaging; Repetition time Abstract: Introduction Magnetic resonance (MR) plaque imaging for carotid arteries is usually performed by using an electrocardiograph (ECG)-gating technique to eliminate pulsation-related artifacts, which can affect the plaque signals because of varied repetition time (TR) among patients. Hence, we investigated whether differences in TR causes signal alterations of the carotid plaque by using a non-gated plaque imaging technique. Methods We prospectively examined 19 patients with carotid stenosis by using a T1-weighted self-navigated radial-scan technique with TRs of 500, 700, and 900 ms. The signal intensity of the carotid plaque was measured, and the contrast ratio (CR) relative to the adjacent muscle was calculated. Results CRs of the carotid plaques were 1.39+-0.39, 1.29+-0.29, and 1.23+-0.24 with TRs of 500, 700, and 900 ms, respectively, and were significantly different. Among the plaques, those with a hyperintensity signal (CR>1.5) and moderate-intensity signal (CR 1.2--1.5) at 500 ms showed a TR-dependent signal decrease (hyperintensity plaques, 1.82+-0.26 1.61+-0.19 and 1.48+-0.17 moderate-intensity plaques, 1.33+-0.08 1.26+-0.08 and 1.19+-0.07), while those with an isointensity signal (CR<1.2) remained unchanged regardless of TR (0.96+-0.12, 0.96+-0.11, and 0.97+-0.13). Conclusion The signal intensity of the carotid plaque on T1-weighted imaging significantly varies among different TRs and tends to decrease with longer TR. MR plaque imaging with short and constant TR settings that the ECG-gating method cannot realize would be preferable for evaluating plaque characteristics. Author Affiliation: (1) Department of Neurology and Gerontology, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan (2) Advanced Medical Research Center, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan (3) Department of Neurosurgery, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan (4) Department of Anatomy, Iwate Medical University, 19-1 Uchimaru, Morioka, Japan Article History: Registration Date: 25/11/2009 Received Date: 02/11/2009 Accepted Date: 25/11/2009 Online Date: 18/12/2009
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