Transcatheter Hepatic Arterial Embolization(TAE)における付加フィルタの検討
スポンサーリンク
概要
- 論文の詳細を見る
It is well known that Interventional Radiology (IVR) is useful. However, the patient dose in IVR is increasing because of the prolongation of fluoroscopic time and the increase in the number of radiographies in recent years. We studied the adequacy of the additional filter for the decrease of the skin surface dose in patients with hepatocellular carcinoma of transcatheter arterial embolization (TAE). In 20 patients (15 men and 5 women, average age: 66.9 and 72.0 years old) who had undergone TAE, we estimated the skin surface dose from the records of their exposure condition (tube voltage, tube current, time, and field size of image intensifier) and the results of the phantom experiment with 2 kinds of additional filter. The estimated skin surface dose of the patient was 1.75±0.84 with the additional filter of 1.5 mm thickness of aluminum (1.5 mmAl), 1.46±0.67 Gy with 0.03 mm thickness tantalum (0.03 mmTa) and 1.17±0.55 Gy with 0.06 mm thickness of tantalum (0.06 mmTa). Against a skin surface dose of 1.5 mmAl, the dose reduction of 16.7% was shown in 0.03 mmTa and 33.2% in 0.06 mmTa. With a DSA phantom of iodine density 0.5 and 1.0 and 2.0 mgI/ml, DSA images were acquisitioned at tube voltage 70, 80 and 90 kV to compare the detectability of contrast media in 0.06 mmTa with 1.5 mmAl. To evaluate the detectability of contrast media in 0.06 mmTa in 1.5 mmAl, receiver operating characteristic (ROC) analysis was performed with the pixel value of the phantom image. The area under the ROC curve in a 1.5 mmAl filter and the 0.06 mmTa filter provided with each contrast media density and each tube voltage was approximately a constant value. It was suggested that there was no differences in the detectability of contrast media in both additional filters. In conclusion, the skin surface dose of the patient was able to be reduced 33.2% without decreasing contrast media detectability by changing the additional filter from 1.5 mmAl to 0.06 mmTa. It was most suitable in TAE in our hospital to choose 0.06 mmTa as an additional filter.
論文 | ランダム
- 果樹園管理のポイント ブドウ
- 果樹園管理のポイント ブドウ
- MR画像に基づいた脳血管性認知障害の虚血病変領域の自動検出法の開発
- 両側後帯状回梗塞後,運動麻痺を伴わないにも関わらず姿勢保持や基本動作に困難を呈した症例(脳機能と理学療法,公募型シンポジウム3,第43回日本理学療法学術大会)
- 多発性筋炎/皮膚筋炎の発症機構,診断,治療 (特集 膠原病の分子医学--基礎と臨床)