[en] Present status of exposure in abdominal interventional radiography (IVR) in author's facility and protection equipment developed by the author for operating staff are described. At present, digital subtraction angiography (DSA) using Shimadzu IVR-TV apparatus (C-vision α) is most popular in author's facility with cut film, continuous, pulse and serial modes, where the skin dose is the smallest in C-vision system. In actual 3 cases of IVR in abdomen, the estimated dose was found 2-9 Gy in total in 2 patients and 27-61 μ Sv in protected staff. The scattering radiation distribution was found changed by the filter which might happen to increase the dose to the staff despite the decrease to the patient. For reduction of the dose, the author developed a new protective device equipped to IVR abdominal angiography apparatus, which consisted from the brim-shaped lead glass, lead barrier panels and lead curtain, to protect operator's head and neck areas, chest and upper abdomen, and lower abdomen, respectively. With the use of this, the distributed dose at DSA was found reduced to 1/27-1/241 of that without the device. Actual measurement of exposure with Aloka semiconductor detector pocket dosimeter revealed the reduction of the dose to about 1/2-1/100 in the operator. The device like this was recommended for protection of operators. (K.H.)

[en] This report described a radiation protection tool for IVR (interventional radiology) operators, which had been developed by the author. The instrument for cardiac angiography was Toshiba C Ω-biplane one CAS-10A and 100A; for X-ray generating, Toshiba KXO-2050; for x-ray tube, DXB1534BH; as the ionization chamber dosemeter, NE IONEX 2500/3; for a pocket dosemeter, Aloka Model PDM-107; and as a phantom, Kyoto-Kagaku SB-4-A (head to abdomen). The exposure dose and distribution of scattering radiation during operation was assessed by the phantom. Author's protection tool consisted from a brim-shaped lead glass for protecting operator's head and neck areas, lead barrier panels for chest and upper abdominal areas and lead apron for lower abdominal area. During the actual IVR clinical practice, the dose was found reduced to 1/43 to 1/2 (1/4 when the Chest Panel was additionally used). Further, it was found quite effective to reduce the exposure dose rate of operator's eyes and thyroid. (K.H.)

[en] We have developed a memory system in which traces of moving contrast material can be made into an image. This system is of great value in obtaining maps of the arteries for superselective catheterization. (author)

[en] A new system of radiation protection for angiographers was developed and its effect evaluated. The system consists of two components for radiation protection; one to protect the abdominal area and the other to protect the head and neck area. The first is composed of a lead curtain attached beneath the tissue table and a movable lead barrier next to the patient's trunk. The second is brim-shaped leaded rubber attached to the image intensifier. In abdominal angiography, the radiation protection system reduced X-ray scatter to 1% of the non-protective condition for the angiographer's abdominal area and to 50% for the head and neck area. This new system reduced X-ray scatter from the patient and enhanced the safety of the angiographer. (author)