Transcript NEMA Standard XR

NEMA Standard XR-21 Phantom을
이용한 혈관조영 장치의 성능 평가
(특수의료장비 기초 연구 자료)
신구대학 방사선과
강병삼
Purpose
IVR 장치의 성능평가를 위한 적절한
검사기준 및 검사방법을 마련 한다
1
2
2
장치, 화질, 선량 관리
Evaluation Item
Image-field
Geometry
Low-contrast
Iodine
Detectability
Phantom
Entrance Dose
Spatial
Resolution
Evaluation
Item
Visibility
Moving
Target
Image
Distortion
Equipments
 NEMA Standard XR-21 Phantom
isocenter
5
5
4
2
1
3
5
6
50mm
Dose measurement point
(25mm below phantom)
X-ray tube
Equipments
장비 대수
지역
측정병원 수
II Type
FD Type
계
전체
21
18
19
37
수도권
4
3
8
11
부산
4
5
2
7
대구
4
3
4
7
대전
2
1
2
3
광주
3
2
2
4
강원
1
1
전북
3
3
1
1
전국 120개 장비 중 50%이상 측정 예정
4
Method
 Image–field Geometry (Beam alignment test)
Perfect
Acceptable
Unacceptable
Method
 Spatial Resolution &
Low Contrast Iodine Detectability
Normal
1st Mag.
2nd Mag.
Iodine Concentration ; 200, 100, 50, 25 mg/cc
Method
 Visibility Moving Target
Irradiated field
Visualized field
Wire Diameter ;
0.022, 0.016, 0.012,
0.009, 0.005 inches
SID
Test plate
X-ray tube
Method
 Visibility Moving Target
Method
 Phantom Entrance Dose
Ion-chamber
Method
 Image Distortion
UP
RIGHT
LEFT
DOWN
Result
 Spatial Resolution
(Lp/mm)
Device
Type
Spatial Resolution
Magnification
Min
Max
Mean
3rd
이론치
Normal
0.8
1.2
1.0 ± 0.1
1.0
1.4
II Type
1st Mag.
1.0
1.6
1.3 ± 0.2
1.2
1.65
(18 units)
2nd Mag.
1.3
1.9
1.6 ± 0.2
1.5
2.05
3rd Mag.
1.6
2.3
2.0 ± 0.2
1.8
2.56
Normal
1.2
1.4
1.3 ± 0.1
1.2
1.4
FD Type
1st Mag.
1.5
1.8
1.6 ± 0.1
1.5
1.6
(19 units)
2nd Mag.
1.7
2.2
1.8 ± 0.2
1.7
2.1
3rd Mag.
2.0
2.4
2.1 ± 0.2
2.0
3.05
Result
 Low-contrast Iodine Detectability
(Number of device)
Device Type
Magnification
Iodine Concentration (mg/cc)
200
100
Normal
13
4
II Type
1st Mag.
12
6
(18 units)
2nd Mag.
8
10
3rd Mag.
7
11
Normal
6
12
FD Type
1st Mag.
2
17
(19 units)
2nd Mag.
2
17
3rd Mag.
1
17
50
1
25
Result
 Phantom Entrance Dose
(R/min)
Device
Type
Phantom Entrance Dose
Magnification
Min
Max
Mean
Over 10 R/min
Normal
0.8
7.7
4.0 ± 2.7
2
II Type
1st Mag.
1.8
12.3
5.5 ± 3.7
3
(18 units)
2nd Mag.
2.0
13.1
7.3 ± 3.6
5
3rd Mag.
6.6
12.2
8.9 ± 1.8
8
Normal
1.9
7.9
4.2 ± 2.1
0
FD Type
1st Mag.
2.2
7.6
4.4 ± 1.9
0
(19 units)
2nd Mag.
2.9
10.0
5.9 ± 2.6
0
3rd Mag.
3.8
12.9
7.4 ± 3.3
1
Result
Device
Type
II Type
(18 units)
FD Type
(19 units)
Using Period of Device Type
Using
Period
Magnification
Over 7y.
Spatial
Resolution (Lp/mm)
Phantom Entrance
Dose (R/min)
Normal
0.9 ± 0.1
3.1 ± 4.3
(8 units)
1st Mag.
1.1 ± 0.2
4.0 ± 4.6
Under 7y.
Normal
1.1 ± 0.3
4.9 ± 2.4
(10 units)
1st Mag.
1.4 ± 0.3
6.8 ± 4.5
Over 3y.
Normal
1.5 ± 0.1
2.8 ± 0.8
(3 units)
1st Mag.
1.8 ± 0.1
2.5 ± 0.3
Under 3y.
Normal
1.3 ± 0.2
3.6 ± 1.7
(16 units)
1st Mag.
1.6 ± 0.2
3.9 ± 1.7
Result
II Type
Device
Type
PHILIPS
GE
SIEMENS
Magnifi
-cation
FD Type
Spatial
Resolution
(Lp/mm)
Phantom
Entrance
Dose (R/min)
(Lp/mm)
Phantom
Entrance
Dose (R/min)
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
Normal
0.8 ± 0.1
6.9 ± 4.0
1.4 ± 0.1
3.3 ± 0.5
1st Mag.
1.1 ± 0.2
8.4 ± 3.6
1.6 ± 0.2
4.2 ± 1.7
Normal
0.9 ± 0.1
0.8 ± 0.3
1.4 ± 0.1
4.0 ± 2.5
1st Mag.
1.2 ± 0.2
1.6 ± 1.3
1.7 ± 0.2
3.8 ± 2.4
Spatial
Resolution
Result
 Wire Resolution (State)
Device
Type
Wire Resolution - State (inch)
Magnification
None
Normal
0.022
0.016
0.012
0.009
0.005
1
5
4
8
3
5
7
3
II Type
1st Mag.
(18 units)
2nd Mag.
6
8
3
3rd Mag.
3
10
5
Normal
5
13
1
FD Type
1st Mag.
1
12
2
(19 units)
2nd Mag.
15
4
3rd Mag.
12
7
Result
 Wire Resolution (Motion)
Wire Resolution - Motion (inch)
Device type
Magnification
None
0.022
0.016
0.012
0.009
Normal
4
2
7
4
1
II Type
1st Mag.
1
5
1
8
3
(18 units)
2nd Mag.
3
4
5
6
3rd Mag.
3
3
2
10
Normal
1
11
7
FD Type
1st Mag.
4
15
(19 units)
2nd Mag.
1
16
2
13
6
3rd Mag.
0.005
Result
 Beam Alignment Test & Image Distortion
Beam Alignment Test
Perfect
Acceptable
Unacceptable
2 (5.5%)
14 (37.8%)
21 (56.7%)
Image Distortion Rate (%)
Direction
Min
Max
Mean
Up/Down
0
12
5.0 ± 4.2
Left/Right
0
19
4.2 ± 4.8
Conclusion
Evaluation
FD type device
excellent at a
most of the
performance
tests.
Not enough of
the difference in
the case of dose
measurements.
Discussion
DSA Phantom(AAPM)
Discussion
ACR Radiography Fluoroscopy
Phantom
Discussion
CDRH Fluoroscopic Phantom
(Conforms to Center for Devices and
Radiological Health)