49.磁振造影檢查中,決定影像切面位置的因子為何?(A)接收頻寬(received bandwidth)的中心頻率(B)接收頻寬(received bandwidth)的頻寬(C)激發頻寬(transmit bandwidth)的中心頻率(D)激發頻寬(transmit bandwidth)的頻寬