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The efficacy of Quantitative Analysis of Basal/Acetazolamide SPECT Using SPM and Statistical Probabilistic Brain Atlas in Patients with Internal Carotid Artery Stenosis  

Lee, Ho-Young (Department of Nuclear Medicine, Seoul National University College of Medicine)
Lee, Dong-Soo (Department of Nuclear Medicine, Seoul National University College of Medicine)
Paeng, Jin-Chul (Department of Nuclear Medicine, Seoul National University College of Medicine)
Oh, Chang-Wan (Department of Neurosurgery, Seoul National University College of Medicine)
Cho, Maeng-Jae (Department of Psychiatry, Seoul National University College of Medicine)
Chung, June-Key (Department of Nuclear Medicine, Seoul National University College of Medicine)
Lee, Myung-Chul (Department of Nuclear Medicine, Seoul National University College of Medicine)
Publication Information
The Korean Journal of Nuclear Medicine / v.36, no.6, 2002 , pp. 357-367 More about this Journal
Abstract
Purpose: While cerebral blood flow and cerebrovascular reserve could be evaluated with basal/acetazolamide Tc-99m-HMPAO SPECT in cerebrovascular disease, objective quantification is necessary to assess the efficacy of the revascularization. In this study we adopted the SPM method to quantify basal cerebral blood flow and cerebrovascular reserve on basal/acetazolamide SPECT in assessment of the patients who underwent bypass surgery for linternal carotid artery (ICA) stenosis. Materials and Methods: Twelve patients ($51{\pm}15$ years) with ICA stenosis were enrolled. Tc-99m-HMPAO basal/acetazolamide perfusion SPECT was peformed before and after bypass surgery. After spatia1 and count normalization to cerebellum, basal cerebral blood flow and cerebrovascular reserve were compared with 21 age-matched normal controls and postoperative changes of regional blood flow and reserve were assessed by Statistical Parametric Mapping method. Mean pixel values of each brain region were calculated using probabilistic anatomical map of lobes. Perfusion reserve was defined as the % changes after acetazolamide over basal counts. Results: Preoperative cerebral blood flow and cerebrovascular reserve were significantly decreased in involved ICA territory, comparing with normal control (p<0.05). Postoperative improvement of cerebral blood flow and cerebrovascular reserve was observed in grafted ICA territories, but cerebrovasculr reserve remained with significant difference with normal control. Improvement of the cerebrovascular reserve was most prominent in the superior temporal and the angular gyrus, nearest to the anastomosis sites. Conclusion: Using SPM quantification method on hasal/acetazolamide Tc-99m-HMPAO SPECT, the cerebral blood flow and cerebrovascular reserve could be assessed before revascularization and so could the efficacy of the bypass surgery.
Keywords
Tc-99m HMPAO; SPECT; SPM; SPAM; Carotid stenosis; Cerebral revascularization;
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