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