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Effectiveness of a New Lead-Shielding Device and Additional Filter for Reducing Staff and Patient Radiation Exposure During Videofluoroscopic Swallowing Study Using a Human Phantom


Interventional radiology procedures often involve lengthy exposure to fluoroscopy-derived radiation. We therefore devised a videofluoroscopic swallowing study (VFSS) procedure using a human phantom that proved to protect the patient and physician by reducing the radiation dose. We evaluated a new lead-shielding device and separately attached additional filters (1.0-, 2.0-, and 3.0-mm Al filters and a 0.5-mm Cu filter) during VFSS to reduce the patient’s entrance skin dose (ESD). A monitor attached to the human phantom’s neck measured the ESD. We also developed another lead shield (VFSS Shielding Box, 1.0-mm Pb equivalent) and tested its efficacy using the human phantom and an ionization chamber radiation survey meter with and without protection from scattered radiation at the physician’s position on the phantom. We then measured the scattered radiation (at 90 and 150 cm above the floor) after combining the filters with the VFSS Shielding Box. With the additional filters, the ESD was reduced by 15.4–55.1%. With the VFSS Shielding Box alone, the scattered radiation was reduced by about 10% compared with the dose without additional shielding. With the VFSS Shielding Box and filters combined, the scattered radiation dose was reduced by a maximum of about 44% at the physician’s position. Thus, the additional lead-shielding device effectively provided protection from scattered radiation during fluoroscopy. These results indicate that the combined VFSS Shielding Box and filters can effectively reduce the physician’s and patient’s radiation doses.

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We thank Ryo Hayasaka (Date Shield Engineering Co., Ltd.), Yohei Inaba, PhD (Department of Radiological Technology, Tohoku University School of Health Sciences), and Hiroo Chiba (Department of Radiology, Tohoku Medical and Pharmaceutical University Hospital) for their help during this study. This work was supported by JSPS Kakenhi (Grant JP15K01387).

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Correspondence to Yoshiaki Morishima.

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Morishima, Y., Chida, K., Muroya, Y. et al. Effectiveness of a New Lead-Shielding Device and Additional Filter for Reducing Staff and Patient Radiation Exposure During Videofluoroscopic Swallowing Study Using a Human Phantom. Dysphagia 33, 109–114 (2018).

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  • Deglutition
  • Deglutition disorders
  • Original lead shielding
  • Scattered radiation protection
  • Additional filter
  • Fluoroscopy
  • Video recording