MR angiography of intracranial aneurysms: A comparison of 0.5 T and 1.5 T

✍ Scribed by Yukunori Korogi; Mutsumasa Takahashi; Nobuhisa Mabuchi; Tsuneya Watabe; Yoshiaki Shiokawa; Hayao Shiga; Toshihiro O'Uchi; Toshio Nakagawa; Hitoshi Miki; Yoshiharu Horikawa; Satoru Fujiwara; Masahiro Furuse

• Book ID: 104350593
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 621 KB
• Volume: 21
• Category: Article
• ISSN: 0895-6111
• DOI: 10.1016/s0895-6111(96)00064-x

✦ Synopsis

The objective of this paper is to compare the diagnostic efficacy of 3 DFf time-of-Bight MR angiography (MRA) at mid&-field-strength aud high-field-strength in diagnosis of intracranial aueurysms. Thirty-one patients, htcltu&g 26 pat&r@ with angiographically continned intracrauiaf aneurysms @I= 28), underwent MRA at 0.5 and 1.5 T. fmages 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 conthtuous confidence-judgment 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% (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 con&don was that high field strength confers higher accuracy in the detection of intracranial aneurysms with MRA with current-generation MR imagers.