Original Article

Scanning electron microscopy observations of rice cooked with non-ionic water-soluble iodine for videofluoroscopic swallowing study

Masaru Konishi, DDS, PhD, Keiji Tanimoto, DDS, PhD
Jpn J Compr Rehabil Sci 8: 66-70, 2017

Objective: The aim of this study was to investigate the distribution of contrast medium on and inside rice for videofluoroscopic swallowing study (VFSS) as observed by scanning electron microscopy (SEM) and radiography. We also examined the influence on texture of mixing the contrast medium.
Methods: Cooked rice for VFSS was prepared using non-ionic water-soluble iodine liquid (VisipaqueR 270) and barium sulfate, and SEM and radiography were performed. Enhancement of the X-ray image was evaluated using the gray-scale. The textures of hardness, adhesiveness, and cohesiveness were measured using a texture analyzer. The Kruskal-Wallis test and Steel- Dwass test were used to compare the measured values.
Results: On SEM, barium sulfate was only attached to the surface of the rice but VisipaqueR 270 was observed inside the rice. The X-ray image of the rice cooked with barium sulfate was mottled; however, VisipaqueR 270 demonstrated uniform enhancement. The grayscale values of the X-ray images were statistically different (p < 0.001), whereas the textures showed no statistical difference.
Conclusion: The rice cooked with VisipaqueR 270 revealed good X-ray enhancement. This was because the contrast medium was distributed not only on the rice surface but also inside the rice.

Key words: videofluoroscopic swallowing study, cooked rice, contrast medium

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