UNLABELLED: Background- It has been suggested that inflammatory cells within vulnerable plaques may be visualized by superparamagnetic iron oxide particle-enhanced MRI. The purpose of this study was to determine the time course for macrophage visualization with in vivo contrast-enhanced MRI using an ultrasmall superparamagnetic iron oxide (USPIO) agent in symptomatic human carotid disease. METHODS: Eight patients scheduled for carotid endarterectomy underwent multisequence MRI of the carotid bifurcation before and 24, 36, 48, and 72 hours after Sinerem (2.6 mg/kg) infusion. RESULTS: USPIO particles accumulated in macrophages in 7 of 8 patients given Sinerem. Areas of signal intensity reduction, corresponding to USPIO/macrophage-positive histological sections, were visualized in all 7 of these patients, optimally between 24 and 36 hours, decreasing after 48 hours, but still evident up to 96 hours after infusion. CONCLUSIONS: USPIO-enhanced MRI of carotid atheroma can be used to identify macrophages in vivo. The temporal change in the resultant signal intensity reduction on MRI suggests an optimal time window for the detection of macrophages on postinfusion imaging.
UNLABELLED: Background- It has been suggested that inflammatory cells within vulnerable plaques may be visualized by superparamagnetic iron oxide particle-enhanced MRI. The purpose of this study was to determine the time course for macrophage visualization with in vivo contrast-enhanced MRI using an ultrasmall superparamagnetic iron oxide (USPIO) agent in symptomatic human carotid disease. METHODS: Eight patients scheduled for carotid endarterectomy underwent multisequence MRI of the carotid bifurcation before and 24, 36, 48, and 72 hours after Sinerem (2.6 mg/kg) infusion. RESULTS: USPIO particles accumulated in macrophages in 7 of 8 patients given Sinerem. Areas of signal intensity reduction, corresponding to USPIO/macrophage-positive histological sections, were visualized in all 7 of these patients, optimally between 24 and 36 hours, decreasing after 48 hours, but still evident up to 96 hours after infusion. CONCLUSIONS: USPIO-enhanced MRI of carotid atheroma can be used to identify macrophages in vivo. The temporal change in the resultant signal intensity reduction on MRI suggests an optimal time window for the detection of macrophages on postinfusion imaging.
Authors: Karen C Briley-Saebo; Tuyen Hoang Nguyen; Alexander M Saeboe; Young-Seok Cho; Sung Kee Ryu; Eugenia R Volkova; Eugenia Volkava; Stephen Dickson; Gregor Leibundgut; Philipp Wiesner; Philipp Weisner; Simone Green; Florence Casanada; Yury I Miller; Walter Shaw; Joseph L Witztum; Zahi A Fayad; Sotirios Tsimikas Journal: J Am Coll Cardiol Date: 2012-02-07 Impact factor: 24.094
Authors: Keng Yeow Tay; Jean Marie U-King-Im; Rikin A Trivedi; Nicholas J Higgins; Justin J Cross; John R Davies; Peter L Weissberg; Nagui M Antoun; Jonathan H Gillard Journal: Eur Radiol Date: 2005-01-27 Impact factor: 5.315
Authors: Tjun Y Tang; Simon P S Howarth; Sam R Miller; Martin J Graves; Jean-Marie U-King-Im; Rikin A Trivedi; Zhi Yong Li; Stewart R Walsh; Andrew P Brown; Peter J Kirkpatrick; Michael E Gaunt; Jonathan H Gillard Journal: J Neurol Neurosurg Psychiatry Date: 2007-06-19 Impact factor: 10.154