Читать книгу Salivary Gland Pathology - Группа авторов - Страница 65

Gradient recalled echo imaging is the second most common type of imaging sequence after the spin‐echo. This sequence is very susceptible (more than spin‐echo T2) to magnetic field inhomogeneity and is commonly used in the brain to identify blood products, metal deposition such as iron, manganese, and nonmetals such as calcium. This sequence is very sensitive but not specific. The “flip angle” used in obtaining GRE can be altered, resulting in either T1 weighted (long flip angle) or T2 weighted (short flip angle) images (Figure 2.10).