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.
Article
in Zh
| WPRIM
| ID: wpr-259041
Responsible library:
WPRO
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>
Full text:
1
Database:
WPRIM
Main subject:
Pathology
/
Diagnostic Imaging
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Cerebral Angiography
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Radiographic Image Enhancement
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Carotid Artery, Internal
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Tomography, X-Ray Computed
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Angiography, Digital Subtraction
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Cerebral Arteries
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Intracranial Arteriosclerosis
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Carotid Stenosis
Type of study:
Diagnostic_studies
Limits:
Aged
/
Female
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Humans
/
Male
Language:
Zh
Journal:
Acta Academiae Medicinae Sinicae
Year:
2009
Document type:
Article