Carotid MRA – what advantages do the turbo field-echo and 3D phase-contrast sequences offer? |
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Authors: | M S Benjamin A R Gillams A P Carter |
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Institution: | (1) Department of Radiology, The Imaging Foundation, Boston City Hospital and Boston University Medical School, Boston, MA 02118, USA, US;(2) Department of Medical Imaging, Middlesex Hospital, Mortimer St., London WW 8AA, UK, GB |
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Abstract: | Our purpose was to investigate some of the newer MR angiography (MRA) techniques for studying the carotid arteries. Forty-two
arteries in seven asymptomatic, healthy volunteers were studied using five MRA sequences: two conventional time-of-flight
sequences, 2D time-of-flight (2DTOF) and 3D time-of-flight (3DTOF); 2D and 3D magnetisation-prepared, segmented time-of-flight
sequences (2DTFE and 3DTFE); and a 3D phase contrast angiography (3DPCA) sequence. A protocol that could be realistically
employed in a routine clinical situation was chosen. 2DTOF had significantly (P < 0.05) better signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) than 2DTFE. 3DTOF demonstrated better SNR than
3DTFE but 3DTFE demonstrated better CNR than 3DTOF. 3DPCA provided maximal anatomical coverage. No one sequence provided optimal
anatomical coverage, accurate demonstration of the carotid bulb and maximal SNR and CNR. The combination of 3DPCA and a 3D
inflow sequence was best. 2DTOF sequences are useful when only one brief sequence is practicably feasible.
Received: 5 July 1996 Accepted: 25 July 1996 |
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Keywords: | Magnetic resonance angiography Carotid artery Stroke prevention |
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