2015 年 4 巻 1 号 p. 34-39
Interventional radiology (IVR) procedures are indispensable in treatment directly connected to lifesaving. As IVR requires X-ray irradiation for a long time and is carried out repeatedly, the skin dose to the patient is high. We measured waveforms of the entrance surface dose in pulsed fluoroscopy with the intent of reducing the exposure dose from IVR. Using a flat-panel detector (FPD) system, we also measured entrance surface doses in various cases in normal- and low-dose modes. As a result, wavetail cutoff of waveforms was confirmed. In addition, we confirmed that in each of the cases of lower pulse rates, lower frame rates, larger FPD sizes, larger irradiation fields, shorter table-FPD distances, and thinner phantom thicknesses, doses decreased. Based on these results, from the perspective of reducing exposure doses, fluoroscopy or exposure should be undertaken using: a low pulse rate; a low frame rate during exposure; a large FPD size without magnification; an irradiation field that is not small; and an FPD brought to close to the patient.
