- 期刊
The Quality of Liver Imaging Compares with Conventional Volume Interpolated Breath-hold Examination And Free-breathing StarVIBE Sequence
比較傳統三維容積內插閉氣序列與自由呼吸StarVIBE序列之肝臟影像品質
摘要
Objective: The purpose of this study is to compare image quality of Volume Interpolated Breath-hold Examination (VIBE) with free-breathing StarVIBE sequence for those patients with liver tumors. Materials and methods: Total forty-three patients with liver tumors were acquired in this study. All MR examination were executed on a wide bore 1.5 Tesla scanner (MAGNETOM Aera, Siemens Healthcare, Erlangen Germany) combined with body 18-channel coil and spine 32-channel coil. After contrast medium injection, volumetric interpolated breath-hold examination ( hepatic arterial phase, portal venous phase and delayed-postcontrast phase ) and free-breathing StarVIBE imaging were both obtained. For delayed-postcontrast phase and StarVIBE, we evaluate the signal-and-ratio ( SNR) and signal intensity for quantitative analysis of image quality, and have two radiologists who have more than ten years' experience of liver MRI to execute qualitative analysis independently and blindly. Result: For quantitative assessment, SNR and signal intensity for StarVIBE is better than 3D volumetric interpolated breath-hold examination, especially for patients who were uncooperated with breath-hold. Although there were no significant statistical differences between two readers regarding scores for StarVIBE and VIBE imaging for lesion detection and final diagnosis. In some cases, patients with respiratory artifacts generally had higher scores on StarVIBE image than VIBE image. Conclusion: For liver MRI, StarVIBE and 3D VIBE sequence both can provide sufficient image to distinguish structural and anatomical assessment. Shorter scan time is always the strong point of VIBE imaging. In contrast, StarVIBE acquisition doesn't need breath-hold cooperation but costs time to trade off. To those patients who cannot hold breath well, except triple- phase acquisition, StarVIBE offers an alternative choice to significantly increase the accuracy of diagnosis.
並列摘要
目的：此研究的目的為針對肝臟有腫瘤的病患，分別利用傳統閉氣方式的序列（VIBE）和自由呼吸方式成像的StarVIBE序列，比較二者的影像品質。材料與方法：總共有四十三位病患參與這次的研究，受試者皆在西門子1.5 Tesla的Mageneton Aera機器執行檢查。打完對比劑後，傳統閉氣方式的VIBE序列和自由呼吸的StarVIBE序列皆會執行。針對VIBE的延遲相和StarVIBE影像，我們分析影像的訊雜比（SNR）和訊號強度，並且請兩位有十年以上影像判讀經驗的放射科醫生評估影像的品質。結果：我們發現不論是訊雜比或者是訊號強度，自由呼吸的StarVIBE序列所得到的評分都高於傳統閉氣方式的VIBE序列；特別是針對無法配合閉氣的病人，雖然經由分析影像品質的評分，兩種序列所得到的分數並沒有顯著的差異，但無法配合閉氣的病患，StarVIBE序列所得到的評分明顯高於需要配合閉氣的VIBE序列。結論：對於肝臟磁振造影而言，StarVIBE序列和VIBE序列都能提供足以診斷的影像品質。傳統閉氣的VIBE序列掃描速度快，能夠取得動脈相、靜脈相和延遲相的影像。StarVIBE序列則是對無法配合閉氣的病人有很大的幫助，雖然因為影像掃描的時間拉長，只能取得延遲相的影像，二者互相搭配，可以提供臨床上選擇對病患最有利的檢查方式。