flash factor
1.A 3D FLASH pulse sequence was used for imaging. This was combined with parallel imaging with an acceleration factor of 2 and echo sharing to reduce the acquisition time to 2~3 seconds per 3D frame. The acquisition was repeated 12 times to depict the arterio-venous anatomy dynamically.
2.The definitions and the conditions of cavitation erosion and flash vaporization have been discussed in detail; the paper also shows examples of different definitions in different books, which cause the complexity of calculating discharge factor and the damage to control valve; suggests relevant measures to avoid the damage in real working condition.
