| 释义 |
DictionarySeesignalsignal void
sig·nal voidin magnetic resonance imaging, a region emitting no radiofrequency signal, because there are no activated protons in the region (such as flowing blood), because a different element predominates, particularly calcium, or because of uncompensated dephasing, such as occurs at air-tissue interfaces in the lung.signal voidA dark or blank space in a radiographic image of a fluid-filled structure. See: filling defectSee also: signalFinancialSeeSignal |