Advantages of using spin-echo-type radial scanning with parallel imaging of the head

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Abstract

type:TOHO University Scholarly Publication

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Background: T1-weighted spin-echo(SE)imaging is generally used in contrast-enhanced imaging of the head. However, the posterior fossa cannot be clearly visualized with this method because of flow-related artifacts from blood vessels. Recent reports have described the use of radial scanning to address this problem. We investigated the characteristics of radial-acquisition regime(RADAR)-SE and the clinical advantages of this technique when combined with rapid acquisition through parallel imaging design(RAPID). Methods: In a phantom study using diluted gadopentetate dimeglumine, contrast levels on RADAR-SE and SE images were compared. Each scan was repeated 5 times, mean contrast was calculated, and contrast levels on SE and RADAR-SE images were quantitatively evaluated. In a clinical study of 31 patients with intracranial disease, flow-related artifacts in RADAR-SE and SE were recorded and compared. Images acquired by SE and RADAR-SE were evaluated independently by 2 radiologists. Results: In the phantom study, there was no significant difference between contrast levels on SE and RADAR-SE images. In clinical imaging, flow-related artifacts were suppressed on RADAR-SE(p<0.001), but streak artifacts were observed in a few cases. Conclusions: RADAR-SE suppressed flow-related artifacts during cranial imaging and thus may facilitate evaluation of intracranial lesions.目的: 造影剤投与後のmagnetic resonance imaging(MRI)撮像において,フローアーチファクトが生じることが知られている.その対策として,radial scanが有用である.今回spin-echo(SE)型radial scanであるradial acquisition regime(RADAR)-SEの有用性をファントムで評価し,parallel imagingを併用したRADAR-SEの有用性を臨床撮像において評価した.対象および方法: ガドペンテト酸ジメグルミンを希釈したファントムを用いてコントラストの評価を行った.次に臨床31症例においてRADAR-SEのフローアーチファクトの評価を行った.結果: ファントム撮像においてRADAR-SEはSEと同等のコントラストが得られた.臨床撮像において,RADAR-SEではSEよりもフローアーチファクトの低減が確認できた.結論: RADAR-SEは頭部撮像において,フローアーチファクトの抑制に有用であった.

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