40.磁振造影的技術中,使用spin-echo脈衝程序,可以取得 proton density weighting,T1 weighting
及T2 weighting影像。下列有關此一技術的敘述,何者錯誤?
(A)Short TR enhances the T1 weighting
(B)Long TR enhances the proton density weighting
(C)Long TE enhances the T1 weighting
(D)Long TE enhances the T2 weighting
39 附圖是一張胸部的磁振影像,很明顯地可以看到兩個肩膀出現在兩側,並干擾到肺部的影像。若要
消除此一干擾,應如何修改取影參數? (A) Increase TR (B) Increase field of view
(C) Increase number of excitations (D) Increase RF amplitude