Table 1 Definition of MRI findings
Term | Reference | Definition | Measurement standard |
|---|---|---|---|
Septum thickness | Timmerman et al. [15]. | Thickness of septum or septa within a cystic tissue | If the septum is irregular, select the thickest focal area. |
Volume of tumor | GAO Mei-chun [16] | – | The volume of tumors was estimated in PACS by measuring the area of the tumor on contiguous 3.0 mm thick transverse slices throughout the whole length of tumor by using manually drawn boundaries. The area was generated automatically, and the volume of tumors were calculated by multiplying the slice thickness with the sum of the tumor cross-sectional area (Cavalieri’s principle) |
Volume of solid portion | Timmerman et al. [15]. | As defined by the IOTA group, at MR imaging, solid tissue enhances after gadolinium chelate injection. Therefore, the solid tissue includes vegetation. | The method of measurement was the same as that of the “volume of tumor”. |
Volume ratio of solid portion | The proportion of solid components in the total tumorous volume | =Volume of solid portion/Volume of tumor | |
Maximum diameter of tumor | The diameter of the largest level of the tumor | – | |
Maximum diameter of solid portion | The diameter of the largest level of the tumorous solid portion | – | |
Maximum diameter ratio of solid portion | The ratio of the maximum diameter of solid portion and the maximum diameter of tumor | =Maximum diameter of solid portion/Maximum diameter of tumor |