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Dual-energy CT angiography for evaluation of internal carotid artery stenosis and occlusion / 中国医学科学院学报
Acta Academiae Medicinae Sinicae ; (6): 215-220, 2009.
Artigo em Chinês | WPRIM | ID: wpr-259041
ABSTRACT
<p><b>OBJECTIVE</b>To compare the feasibility of bone and calcified plaque subtracted dual-energy CT angiography (CTA) with time of flight magnetic resonance angiography (TOF MRA) in evaluation of internal carotid artery atherosclerosis.</p><p><b>METHODS</b>Totally 32 patients received a dual-energy CTA scan, along with a cerebral TOF MRA scan before or after CTA examination from one day to one month. Dual-energy software was used for bone and calcified plaque subtraction. Five anatomical segments were described for each internal carotid artery according to Fischer (1938). Ratings were based on a 1-4 scale for the dual-energy CTA maximum intensity projection (MIP) image 1 not diagnostic, 2 partially diagnostic, 3 diagnostic, and 4 excellent. Lesions were categorized as mild (0-29%), moderate (30%-69%), severe (70%-99%), or occluded (no flow detected). Stenosis of internal carotid artery was evaluated based on post-subtracted CTA images and TOF MRA images.</p><p><b>RESULTS</b>In 320 arterial segments, 99% of arterial segments were > or = 3 score. Grading of stenosis on dual-energy CTA agreed with grading of stenoses on MRA images in 98% of arteries. In the mild and occlusion group, the agreement was 100% respectively. In the moderate and severe group, dual-energy CTA showed more severe stenosis than MRA in 7 vessels and there was significant difference between the results from the two different modalities (Z = -3.071, P = 0.002).</p><p><b>CONCLUSION</b>Dual-energy CTA can be used to assess the stenosis of internal arteries around skull base, but may exaggerate the severe stenosis of cerebral arteries compared with TOF MRA.</p>
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Patologia / Diagnóstico por Imagem / Angiografia Cerebral / Intensificação de Imagem Radiográfica / Artéria Carótida Interna / Tomografia Computadorizada por Raios X / Angiografia Digital / Artérias Cerebrais / Arteriosclerose Intracraniana / Estenose das Carótidas Tipo de estudo: Estudo diagnóstico Limite: Idoso / Feminino / Humanos / Masculino Idioma: Chinês Revista: Acta Academiae Medicinae Sinicae Ano de publicação: 2009 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Patologia / Diagnóstico por Imagem / Angiografia Cerebral / Intensificação de Imagem Radiográfica / Artéria Carótida Interna / Tomografia Computadorizada por Raios X / Angiografia Digital / Artérias Cerebrais / Arteriosclerose Intracraniana / Estenose das Carótidas Tipo de estudo: Estudo diagnóstico Limite: Idoso / Feminino / Humanos / Masculino Idioma: Chinês Revista: Acta Academiae Medicinae Sinicae Ano de publicação: 2009 Tipo de documento: Artigo