MR angiography of intracranial aneurysms: A comparison of 0.5 T and 1.5 T
| Autor: | Satoru Fujiwara, Hitoshi Miki, Tsuneya Watabe, Masahiro Furuse, Mutsumasa Takahashi, Yukunori Korogi, Yoshiharu Horikawa, Toshihiro O'Uchi, Yoshiaki Shiokawa, Hayao Shiga, Toshio Nakagawa, Nobuhisa Mabuchi |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
medicine.medical_specialty
Health Informatics Sensitivity and Specificity Magnetic resonance angiography Central nervous system disease Ophthalmic Artery Aneurysm medicine.artery Basilar artery medicine Humans Single-Blind Method Radiology Nuclear Medicine and imaging cardiovascular diseases Retrospective Studies Observer Variation Radiological and Ultrasound Technology medicine.diagnostic_test business.industry Intracranial Aneurysm Magnetic resonance imaging Arteries Cerebral Arteries Image Enhancement medicine.disease Computer Graphics and Computer-Aided Design Cerebral Angiography Basilar Artery Ophthalmic artery Choroid Plexus cardiovascular system Circle of Willis Computer Vision and Pattern Recognition Radiology business Algorithms Magnetic Resonance Angiography Cerebral angiography |
| Zdroj: | Computerized Medical Imaging and Graphics. 21:111-116 |
| ISSN: | 0895-6111 |
| DOI: | 10.1016/s0895-6111(96)00064-x |
| Popis: | The objective of this paper is to compare the diagnostic efficacy of 3 DFT time-of-flight MR angiography (MRA) at middle-field-strength and high-field-strength in diagnosis of intracranial aneurysms. Thirty-one patients, including 26 patients with angiographically confirmed intracranial aneurysms (n = 28), underwent MRA at 0.5 and 1.5 T. Images were interpreted by six trained observers who were blinded to diagnosis. Twelve projections of MRA of the circle of Willis, by maximum-intensity projection algorithm, were reviewed using continuous confidence-judgement scales. It was found that MRA at 1.5 T was more sensitive than that at 0.5 T in detection of aneurysms. The sensitivity of six observers ranged between 50 and 64% (mean 56%) at 0.5 T, and between 61 and 86 86% (mean 75%) at 1.5 T. In the smaller aneurysms less than 5 mm, the differences between the units became greater. The sensitivity for small aneurysms ranged from 23 to 54% (mean 32%) at 0.5 T, and from 31 to 69% (mean 58%) at 1.5 T. Our conclusion was that high field strength confers higher accuracy in the detection of intracranial aneurysms with MRA with current-generation MR imagers. |
| Databáze: | OpenAIRE |
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