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Study about air dose distributions of Neuro intervention room

Study about air dose distributions of Neuro intervention room. Samsung Medical Center Park Ji Min. Increase of neuro intervention. Insensibility about radiation. Recognition about radiation. Air dose measurement and analysis. Efficient management about radiation. Purpose.

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Study about air dose distributions of Neuro intervention room

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  1. Study about air dose distributions of Neuro intervention room Samsung Medical Center Park Ji Min

  2. Increase of neuro intervention Insensibility about radiation Recognition about radiation Air dose measurement and analysis Efficient management about radiation Purpose

  3. Measurement equipment • Philips Allura Xper FD 20/10

  4. Measurement equipment • Skull Phantom (∅16cm, Plexiglas) • Survey meter(model 20X4-1800) • Radiation monitor controller(model2026)

  5. Measurement method 1. A datum point dose measurement - 30, 50, 70, 100, 150, 200cm - Each 10 measurements of frontal, lateral, bi-plane dose

  6. 2. Dose measurement following angle - 30, 60, 120, 150, 210, 240, 300, 330° - Measurement from datum point to identical dose for distance - Drawing up Isodose curve

  7. 3. Dose measurement following height - 45, 135, 225, 315° - The location which 1m falls from the transmission center - Measurement of dose at height of 30, 60, 90, 120, 150, 180, 210cm

  8. 각도 평균 (R/h) Result (A-1) Dose distributions in frontal fluoroscopy (unit: cm)

  9. Isodose curve of radiation distribution (A-1)

  10. 각도 평균 (mR/h) Result (A-2) Dose distributions in lateral fluoroscopy (unit: cm)

  11. Isodose curve of radiation distribution (A-2)

  12. 각도 평균 (R/h) Result (A-3) Dose distributions in bi-plane fluoroscopy (unit: cm)

  13. Isodose curve of radiation distribution (A-3)

  14. Result (B-1) Dose of each quadrant from height (frontal) 각도 높이 (cm) (mR/h)

  15. 2. Dose distributions for the height (B-1)

  16. Result (B-2) Dose of each quadrant from height (lateral) 각도 높이 (cm) (mR/h)

  17. 2. Dose distributions for the height (B-2)

  18. Result (B-3) Dose of each quadrant from height (Bi-plane) 각도 높이 (cm) (mR/h)

  19. 2. Dose distributions for the height (B-3)

  20. Consideration 1.Decrease of dose at datum point(0˚) • Absorption of scatter ray at operation table 2. Increase of dose from 210˚to 330˚in lateral fluoroscopy • Most scattered ray around lateral tube • Less scattered ray around operator 3. Relation with Annual effective dose limit • Annual average 20mSv, 20days per month, 1hour per day ⇒ 0.08mSv = 0.1R/h • 10 times over at 70cm • 5.7 times at 1m • Over 2m is safety

  21. Consideration 4. The most dose at height of 120cm • The most scattered ray from object 5. Increase of dose in 90cm than the 150cm height (frontal fluoroscopy) • Much scattered ray around frontal tube 6. Increase of dose in 150cm than the 90cm height (lateral fluoroscopy) • Absorption of scatter ray at operation table

  22. Conclusion Unrecognized scattered ray and accumulate dose ⇒ Using suitable protector and recognizing air dose distribution ⇒ It is required to effective management of radiation

  23. THANK YOUFORYOUR ATTENTION

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