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Dual energy Material decomposition in Radiography 1
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Page 1: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

Dual energy Material decomposition

in Radiography

1

Page 2: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

CONTENTS

001 Basis set decomposition

002 Single projection imaging

003 Synthesized monoenergetic images (CEF , SNR)

- Material displacement

- Method

004 Experiment

2

005 MCNP

Page 3: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

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Page 4: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

4

×′

×

001. Basis set decomposition

물질의 수 n < 3

yes no

Page 5: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

5

1가지 재료 2가지 재료

,

Page 6: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

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002. Single projection imaging

×′

Page 7: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

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- Material displacement

기본 정의 물질의 변위

Page 8: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

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- Method

Predicted angle(𝜃𝜃)

Measured angle(𝜃𝜃)

(과 길이단위)

Page 9: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

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003. Synthesized monoenergetic images (CEF , SNR)

두 식을 함께 사용하면 최적의 투영각을 선택할 수 있다.

Page 10: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

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004. Experiment

Basis Material : Al, Lucite

Al : 두께 1cm씩 4cm까지 측정

Lucite : 두께 4cm씩 20cm까지 측정

High energy : 120 keVLow energy : 80 keV 실험에 쓰일 장치인 detector , source , phantom

Page 11: Dual energy Material decomposition in Radiographybml.pusan.ac.kr/LectureFrame/Lecture/Undergraduates... · 2017. 4. 13. · in Radiography. 1. CONTENTS. 001 Basis set decomposition.

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005. MCNP

1. 각 물질에 대한, 두께에 따른 특성(Intensity) 비교Al, Lucite(PMMA), Bone, Water, Teflon, NaCl, Polyethylene

2. 두께에 따른 Compton scattering 및 Photon electric effect 비교

DetectorCase 2

Source

Case 1

Case 1 Source와 최대한 가깝게 : P

Case 2 Detector와 최대한 가깝게 : P+S


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