Fig. 6c shows that the shapes of cells of IF products were more regular and less torn compared to Fig. 6b. However, many cells were still separated and some cell walls were disrupted. The light micrographs for frozen-then-thawed radish tissues under various ultrasonic power intensities are shown in Fig. 6d–g. It can be seen that there was a considerable difference in the microstructure of radish tissues under the treatments of various ultrasonic power intensities. Under the UAF-2 and UAF-3, the cells packed tightly with neighboring ones and little intercellular spaces were observed. No cell wall disruption happened, but few cells separation was observed.