Table 1. The comparison of magnetic resonance imaging (MRI) and ultrasound.
| Parameter | MRI | Ultrasound |
| Real-time | Quasi real-time | Real-time |
| Resolution | Good | Affected by many factors |
| Blinking spot | No | Yes |
| Thermometry | Able | Unable |
| Grayscale change | Visible | Invisible |
| Image quality | Providing clear images, larger field-of-view | Combination with other imaging modalities needed |
| Efficacy evaluation | Done immediately after the procedure | Delayed assessment |
| Artifacts | Less | Obvious |
| Cost | Expensive | Cheap |
| Compatibility | Not compatible for some devices | Compatible |
| Sound shadow | Without shadow | Obvious shadow |
| Three-dimension structure | Multiple planar imaging | 3D ultrasound |
| The stability of image quality | Excellent correlation with pathologic results | Manipulator variability, it may become worse during the procedure |