A Survey of Exposure Doses in Several Angiographic Systems

Sato, Toshimitsu; Eguchi, Yoichi; Okada, Akio; Kimura, Hitoshi; Tosa, Tetsuo; Segawa, Koichi; Sato, Kunihiko; Ohhisa, Toshihiro; Kubota, Hiroyuki

doi:10.6009/jjrt.kj00003110004

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…More exposure occurs in embolization therapies of cerebral AVMs than in therapies of cerebral aneurysms is probably due to the more frequent manual injection of the contrast medium performed by the operator under fluoroscopy, while the number of manual injections is not recorded in this document 6,7 . We must have some knowledge or general consideration about dose distribution in angiographic rooms and the method of dosimetry before discussing how to reduce radiation exposure to personnel in interventional neuroradiology 8 . In the paper written by K. Nishizawa, the dose distribution of scattering X-ray in an angiographic room is described and the exposure radiation dose is reduced exponentially according to the distance from the X-ray tube to the site of the personnel.…”

Section: Discussionmentioning

confidence: 99%

Practical Protective Tools for Occupational Exposure: 1) Double Focus Spectacles for the Aged with Highly Refracted Glass Lens 2) Remodeled Barrier for Radiation Protection

Kurokawa

Yabe²,

Takamura³

et al. 2000

Interv Neuroradiol

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Two practical protective tools for occupational exposure for neurointerventional radiologists are presented. The first purpose of this study was to investigate the effectiveness of double focus spectacles for the aged with a highly refracted glass lens (special spectacles for the aged) for radiation protection of the crystalline lens of the eye in comparison with other spectacles on the market, based on the measurement of film density which was obtained by exposure of X-ray through those spectacles. As a result of the film densitometry mentioned above, the effectiveness of special spectacles for the aged in radiation protection was nearly equal to the effectiveness of a goggle type shield which is made with a 0.07 mm lead-equivalent plastic lens. The second purpose of this study was to investigate the effectiveness of the protective barrier, which we remodeled for cerebral angiography or neuroendovascular therapy, for radiation exposure, based on the measurement in a simulated study with a head phantom, and on the measurement of radiation exposure in operaters during procedures of clinical cases. In the experimental study radiation exposure in supposed position of the crystalline lens was reduced to about one third and radiation exposure in supposed position of the gonadal glands was reduced to about one seventh, compared to radiation exposure without employing the barrier. The radiation exposure was monitored at the left breast of three radiologists, in 215 cases of cerebral angiography. Employing the barrier in cerebral angiography, average equivalent dose at the left breast measured 1.49μ Sv during 10 min of fluoroscopy. In three kinds of neuroendovascular therapy in 40 cases, radiation exposure in an operator was monitored in the same fashion and the dose was recorded less than the result reported in previous papers in which any protective barrier have not been employed in the procedure1,2. As a result, the two above mentioned protective tools are considered practical in clinical usage and very effective to reduce radiation exposure in an operator of interventional neuroradiolgy which may sometimes require many hours to complete the therapy under extended fluoroscopic time.

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Section: Discussionmentioning

confidence: 99%