Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
Clinical Technologies
Examination of Patient Dose Reduction in Cardiovasucular X-ray Systems with a Metal Filter
Mitsuyoshi YasudaKyouichi KatoNobuaki TanabeKoushi SakiyamaYushi UchiyamaYoshiaki SuzukiHiroshi SuzukiYasuo Nakazawa
Author information
JOURNAL FREE ACCESS

2012 Volume 68 Issue 3 Pages 247-253

Details
Abstract

In interventional X-ray for cardiology of flat panel digital detector (FPD), the phenomenon that exposure dose was suddenly increased when a subject thickness was thickened was recognized. At that time, variable metal built-in filters in FPD were all off. Therefore, we examined whether dose reduction was possible without affecting a clinical image using metal filter (filter) which we have been conventionally using for dose reduction. About 45% dose reduction was achieved when we measured an exposure dose at 30 cm of acrylic thickness in the presence of a filter. In addition, we measured signal to noise ratio/contrast to noise ratio/a resolution limit by the visual evaluation, and there was no influence by filter usage. In the clinical examination, visual evaluation of image quality of coronary angiography (40 cases) using a 5-point evaluation scale by a physician was performed. As a result, filter usage did not influence the image quality (p=NS). Therefore, reduction of sudden increase of exposure dose was achieved without influencing an image quality by adding filter to FPD.

Content from these authors
© 2012 Japanese Society of Radiological Technology
Previous article Next article
feedback
Top