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Article Abstract
Purpose: The objective of this study was to determine the standard settings of the angiography system during EVT in Japan.
Methods: Survey requests were mailed to 493 facilities across Japan. The survey items included in the survey were system display dose setting of fluoroscopy dose (FL dose)/digital angiography dose (DA dose)/digital subtraction angiography dose (DSA dose), detector size, fluoroscopy pulse rate, DA/DSA frame rate, and standard additional filter settings. The number of valid responses for each item was system display dose setting: 187 systems (128 institutions), detector size: 187 systems (128 institutions), fluoroscopy pulse rate and DA/DSA frame rate: 185 systems (127 institutions), standard additional filter settings: 182 systems (125 institutions).
Results: Median (interquartile range) of each system display dose setting was FL: 5.9 (4.2-7.8) mGy/min, DA: 0.10 (0.06-0.16) mGy/frame, DSA: 0.82 (0.64-1.40) mGy/frame. The detector size for dose measurements was 103 systems (55%) with a diagonal of 35 cm or less and 84 systems (45%) with a diagonal of more than 35 cm. The most used FL pulse rate was 7.5 pulse/s (132 systems: 71%), DA frame rate was 7.5 frame/s (72 systems: 39%), and DSA frame rate was 3 frame/s (97 systems: 52%). More than 90% of the institutions used some kind of additional filter for imaging.
Conclusion: This survey showed the standard setting of the angiography system during EVT in Japan.
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