Evaluation of Intracranial Aneurysms with 7 T versus 1.5 T Time-of-Flight MR Angiography – Initial Experience

Mönninghoff, Christoph; Maderwald, Stefan; Theysohn, JM; Kraff, Oliver; Ladd, Susanne C.; Ladd, Mark E.; Forsting, Michael; Quick, Harald H.; Wanke, Isabel

doi:10.1055/s-2008-1027863

Cited by 54 publications

(38 citation statements)

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“…Gibbs et al [9] compared the delineation ability of 3T MRI with 1.5T MRI in patients known to have intracranial aneurysms [9] and found that 3T MR angiography had a greater ability to delineate intracranial aneurysms than 1.5T MRI. By contrast, Mönninghoff et al [10] reported that 7T MRI was superior in spatial resolution, but that all aneurysms were detected with 1.5T MRI, although the study was limited to only 10 patients with known intracranial aneurysms. Their findings suggest that high-tesla MRI should provide greater image quality and an accordingly more precise delineation of anatomical structure and a higher detection rate of intracranial aneurysms, as proven in our data.…”

Section: Discussionmentioning

confidence: 96%

Initial Experience in Evaluating the Prevalence of Unruptured Intracranial Aneurysms Detected on 3-Tesla MRI

Igase¹,

Matsubara²,

Igase³

et al. 2012

Cerebrovasc Dis

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Background: Given the very poor outcome of ruptured intracranial aneurysms, detection and treatment of unruptured intracranial aneurysms by a less invasive examination have become important. For this purpose, 3-tesla (3T) magnetic resonance imaging (MRI) is the most suitable candidate, owing to its high signal/noise ratio and frequency resolution. However, few reports have investigated the prevalence of intracranial aneurysms with high-tesla MRI. Here, we evaluated the prevalence of intracranial aneurysms and the effectiveness of a 3T MRI system in their detection. Methods: During a 1-year period, a total of 3,414 consecutive patients undergoing MR angiography with 3T MRI for the first time were enrolled. Diagnosis of intracranial aneurysm was made by two neuroradiologically trained medical doctors under complete blinding to patient information. When intracranial aneurysm was suspected, volume-rendering images were created for more accurate diagnosis. Results: Surprisingly, 317 unruptured intracranial aneurysms were identified in 286 of 3,414 cases (8.4%); 151 unruptured aneurysms (47.6%) occurred in the internal carotid artery, 85 (26.8%) in the middle cerebral artery, 54 (17.0%) in the anterior cerebral artery, and 27 (8.5%) in the posterior circulation. Of these, 152/317 (47.9%) were <3 mm, 104 (32.8%) ranged from 3 to 5 mm, 5 (11.0%) from 5 to 7 mm, and 26 (8.2%) were >7 mm. No significant difference in size was seen among the four locations.Conclusions: For the first time, this study assessed the detection rate of intracranial aneurysms using 3T MRI. Results showed a higher detection rate than previously documented. The reason for this higher rate is likely the improved ability of this modality to detect unruptured aneurysms in the internal carotid artery and those <3 mm.

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Section: Discussionmentioning

confidence: 96%

Initial Experience in Evaluating the Prevalence of Unruptured Intracranial Aneurysms Detected on 3-Tesla MRI

Igase¹,

Matsubara²,

Igase³

et al. 2012

Cerebrovasc Dis

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“…Furthermore, local RF transmit coils excite a rather small RF volume where entering RF pulses are not pre-saturated, which potentially contributes to the hyperintense signal [34]. This interesting feature of T1-weighted MRI at 7 Tesla led to a shift of the focus of ultra-high-field brain imaging from structural to vessel diagnostics [10,13,31,35,36]. One of the first studies to assess the feasibility and diagnostic value of intracranial MRA at 7 Tesla was introduced by Maderwald et al [31].…”

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confidence: 99%

“…Mön-ninghoff et al compared the diagnostic ability of 7 T versus 1.5 T time-of-flight (TOF) MRA in patients with intracranial aneurysms. They could prove a diagnostic benefit due to the increased spatial resolution of 7 T TOF MRA [10,13]. After successful demonstration of the feasibility of 7 Tesla brain imaging, first field strength comparison trials were conducted ( • " Fig.…”

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confidence: 99%

7 Tesla MR Imaging: Opportunities and Challenges

Umutlu

Ladd

Forsting³

et al. 2013

Fortschr Röntgenstr

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The urge to increase magnetic field strength is driven by a number of potentially beneficial physical changes, possibly resulting in improved MR diagnostics. With the successful introduction of in-vivo ultra-high-field MR imaging, by means of 7 Tesla MRI, the focus of scientific research has been set on compiling different applications of brain and body imaging. This review presents an overview on the current status of 7?T MR imaging, investigating the opportunities as well as challenges associated with ultra-high-field MRI. Citation Format: ??Umutlu L, Ladd ME, Forsting M et?al. 7 Tesla MR?Imaging: Opportunities and Challenges. Fortschr R?ntgenstr 2014; 186: 121???129

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“…However, TOF MRA at high field strength suffers from increased artifacts. Initial results have shown advantages of ultra-high field in structural analysis of aneurysms or arterio-venous malformations [53][54][55] (Fig. 3b).…”

Section: Vesselsmentioning

confidence: 99%