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NEMA Standard XR-21 Phantom을 이용한 혈관조영 장치의 성능 평가 (특수의료장비 기초 연구 자료)

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Presentation on theme: "NEMA Standard XR-21 Phantom을 이용한 혈관조영 장치의 성능 평가 (특수의료장비 기초 연구 자료)"— Presentation transcript:

1 NEMA Standard XR-21 Phantom을 이용한 혈관조영 장치의 성능 평가 (특수의료장비 기초 연구 자료)
신구대학 방사선과 강 병 삼

2 Purpose IVR 장치의 성능평가를 위한 적절한 검사기준 및 검사방법을 마련 한다 1 2 2 장치, 화질, 선량 관리

3 Evaluation Item Image-field Geometry Spatial Resolution Low-contrast
Iodine Detectability Visibility Moving Target Evaluation Item Phantom Entrance Dose Image Distortion

4 Dose measurement point
Equipments NEMA Standard XR-21 Phantom 6 5 3 1 2 4 isocenter 50mm Dose measurement point (25mm below phantom) X-ray tube

5 Equipments 전 체 21 18 19 37 전국 120개 장비 중 50%이상 측정 예정 지 역 측정병원 수 계
장비 대수 II Type FD Type 전 체 21 18 19 37 수도권 4 3 8 11 부 산 5 2 7 대 구 대 전 1 광 주 강 원 전 북 전국 120개 장비 중 50%이상 측정 예정

6 Method Image–field Geometry (Beam alignment test) Perfect Acceptable
Unacceptable

7 Iodine Concentration ; 200, 100, 50, 25 mg/cc
Method Spatial Resolution & Low Contrast Iodine Detectability Normal 1st Mag. 2nd Mag. Iodine Concentration ; 200, 100, 50, 25 mg/cc

8 Method Visibility Moving Target Irradiated field Visualized field
X-ray tube Test plate SID Irradiated field Visualized field Wire Diameter ; 0.022, 0.016, 0.012, 0.009, inches

9 Method Visibility Moving Target

10 Method Phantom Entrance Dose Ion-chamber 팬텀 표면 선량의 측정 방법입니다.
20cm 팬텀의 표면 하부 25mm지점의 종축 센터에 이온챔버를 위치시켜 입사표면 선량률을 측정 하였습니다. 선량률도 마찬가지로 확대율에 따라 각각 측정 하였습니다.

11 Method Image Distortion UP RIGHT LEFT DOWN 영상왜곡도의 측정 방법 입니다.
혈관조영 장치인 C-arm의 각도를 모두 0도로 맞춘 후 Beam Alignment Test Tool을 납자위에 위치시켜 영상의 크기를 상하, 좌우로 각각 측정하여 왜곡도를 계산하였습니다. DOWN

12 Result Spatial Resolution (Lp/mm) Device Type Magnification
Min Max Mean 3rd 이론치 II Type (18 units) Normal 0.8 1.2 1.0 ± 0.1 1.0 1.4 1st Mag. 1.6 1.3 ± 0.2 1.65 2nd Mag. 1.3 1.9 1.6 ± 0.2 1.5 2.05 3rd Mag. 2.3 2.0 ± 0.2 1.8 2.56 FD Type (19 units) 1.3 ± 0.1 1.6 ± 0.1 1.7 2.2 1.8 ± 0.2 2.1 2.0 2.4 2.1 ± 0.2 3.05

13 Low-contrast Iodine Detectability
Result Low-contrast Iodine Detectability (Number of device) Device Type Magnification Iodine Concentration (mg/cc) 200 100 50 25 II Type (18 units) Normal 13 4 1st Mag. 12 6 2nd Mag. 8 10 3rd Mag. 7 11 FD Type (19 units) 2 17 1

14 Result Phantom Entrance Dose (R/min) Device Type Magnification
Max Mean Over 10 R/min II Type (18 units) Normal 0.8 7.7 4.0 ± 2.7 2 1st Mag. 1.8 12.3 5.5 ± 3.7 3 2nd Mag. 2.0 13.1 7.3 ± 3.6 5 3rd Mag. 6.6 12.2 8.9 ± 1.8 8 FD Type (19 units) 1.9 7.9 4.2 ± 2.1 2.2 7.6 4.4 ± 1.9 2.9 10.0 5.9 ± 2.6 3.8 12.9 7.4 ± 3.3 1

15 Using Period of Device Type
Result Device Type Using Period Magnification Using Period of Device Type Spatial Resolution (Lp/mm) Phantom Entrance Dose (R/min) II Type (18 units) Over 7y. (8 units) Normal 0.9 ± 0.1 3.1 ± 4.3 1st Mag. 1.1 ± 0.2 4.0 ± 4.6 Under 7y. (10 units) 1.1 ± 0.3 4.9 ± 2.4 1.4 ± 0.3 6.8 ± 4.5 FD Type (19 units) Over 3y. (3 units) 1.5 ± 0.1 2.8 ± 0.8 1.8 ± 0.1 2.5 ± 0.3 Under 3y. (16 units) 1.3 ± 0.2 3.6 ± 1.7 1.6 ± 0.2 3.9 ± 1.7

16 Spatial Resolution (Lp/mm)
Result Device Type Magnifi -cation II Type FD Type Spatial Resolution (Lp/mm) Phantom Entrance Dose (R/min) Spatial Resolution (Lp/mm) Phantom Entrance PHILIPS Normal 1.2 ± 0.2 5.1 ± 2.4 1.4 ± 0.1 2.6 ± 0.2 1st Mag. 1.5 ± 0.3 7.1 ± 5.0 1.7 ± 0.1 3.1 ± 0.2 GE 0.8 ± 0.1 6.9 ± 4.0 3.3 ± 0.5 1.1 ± 0.2 8.4 ± 3.6 1.6 ± 0.2 4.2 ± 1.7 SIEMENS 0.9 ± 0.1 0.8 ± 0.3 4.0 ± 2.5 1.6 ± 1.3 1.7 ± 0.2 3.8 ± 2.4

17 Wire Resolution - State (inch)
Result Wire Resolution (State) Device Type Magnification Wire Resolution - State (inch) None 0.022 0.016 0.012 0.009 0.005 II Type (18 units) Normal 1 5 4 8 1st Mag. 3 7 2nd Mag. 6 3rd Mag. 10 FD Type (19 units) 13 12 2 15

18 Wire Resolution (Motion) Wire Resolution - Motion (inch)
Result Wire Resolution (Motion) Device type Magnification Wire Resolution - Motion (inch) None 0.022 0.016 0.012 0.009 0.005 II Type (18 units) Normal 4 2 7 1 1st Mag. 5 8 3 2nd Mag. 6 3rd Mag. 10 FD Type (19 units) 11 15 16 13

19 Image Distortion Rate (%)
Result Beam Alignment Test & Image Distortion Beam Alignment Test Perfect Acceptable Unacceptable 2 (5.5%) 14 (37.8%) 21 (56.7%) Direction Image Distortion Rate (%) Min Max Mean Up/Down 12 5.0 ± 4.2 Left/Right 19 4.2 ± 4.8

20 Conclusion Evaluation
FD type device excellent at a most of the performance tests. Not enough of the difference in the case of dose measurements.

21 Discussion DSA Phantom(AAPM)

22 Discussion ACR Radiography Fluoroscopy Phantom

23 Discussion CDRH Fluoroscopic Phantom
(Conforms to Center for Devices and Radiological Health)

24 Thank You !


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