X-ray Mobile System에서 디텍터 기울기 변화에 따른 영상 특성에 관한 연구
The Study on Image Characteristics According to Changes the Detector Angle in the X-ray Mobile System
- 주제(키워드) Mobile Radiography , X-ray Mobile System , Detector , Angle , Distortion
- 발행기관 고려대학교 의용과학대학원
- 지도교수 이윤
- 발행년도 2016
- 학위수여년월 2016. 2
- 학위구분 석사
- 학과 의용과학대학원 의료영상공학과
- 원문페이지 37 p
- 실제URI http://www.dcollection.net/handler/korea/000000066290
- 본문언어 한국어
- 제출원본 000045867373
초록/요약
현대 과학 기술의 발달로 인하여 디지털화된 의료 방사선 기술은 현대 임상의학 및 진단에 핵심적인 역할을 하며, DR System의 무선 검출기는 이동형 X선 촬영 장비와 다양한 형태로 함께 사용되어지고 있다. 이동형 X선 장비의 부적절한 조작에 의해 발생되는 초점과 검출기 위치(각도)에 따른 기하학적 왜곡에 주목하고, 이에 따른 실험과 왜곡된 영상을 줄이기 위한 방안을 제시하고자 한다. 0°~45°의 각도 변화에 따른 크리스탈 정육면체와 구형 팬텀의 실험의 영상에서 약 56.85mm(정육면체)의 길이 변화로 정사각형에서 직사각형으로의 영상 왜곡과 약 35.73mm의 세로 방향의 길이 변화로 원형에서 타원형으로의 영상 왜곡이 있었으며, 그리드를 이용한 실험에서는 4°에서 영상의 신호 변화가 급격히 이루어졌다. Chest Phantom을 이용한 실험에서는 심장의 가로방향 길이는 최대 14.463mm, 흉곽의 가로방향 길이는 최대 28.78mm의 변화가 있었으며, 1번 늑골에서 10번 늑골까지의 세로 방향의 길이는 최대 382.17mm로 약 126.84%의 변화량으로 각각의 실험 결과로 보아 각도가 커질수록 영상의 왜곡이 심해지는 것을 알 수 있었다. 이러한 왜곡을 줄이고자 제안한 스마트폰 경사측정 어플리케이션을 이용하여 TUBE와 영상수신부의 각도를 수직 방향으로 일치시킨 실험 영상에서는 심장 : 약 0.01mm, 흉곽 : 약 0.076mm, 늑골 : 약 0.048mm로 각각의 평균 길이 차이로 영상의 왜곡이 거의 없음을 확인하였다. 검출기와 Tube 각도의 일치성 여부 기능이 탑재가 되지 않은 장비에 경사측정 어플리케이션을 이용할시 영상의 왜곡을 줄임과 동시에 진단학적 가치가 높은 최적의 영상을 제공할 수 있을 것으로 사료된다.
more목차
목차 ····································································································Ⅰ
표목차 ······························································································· Ⅱ
그림목차 ··························································································· Ⅲ
Ⅰ. 서론 ······························································································ 1
Ⅱ. 이론적 배경 ················································································· 2
1. 방사선 영상 획득 시스템 ······················································· 2
1) 디지털 방사선 영상 ···························································· 2
2) 직접획득 시스템 영상 ························································ 3
3) 디지털 의료영상 관리 ························································ 3
2. 이동형 X선 촬영장비 ······························································ 4
1) 전원공급 ··············································································· 4
2) 발생장치 ··············································································· 4
3) 이동전력 ··············································································· 5
4) 거리 ······················································································· 5
3. 선예도(Sharpness) ······························································· 5
1) 기하학적 불선예도 ····························································· 5
(1) 확대율 ············································································· 5
(2) 왜 곡 ················································································ 6
Ⅲ. 실험 기재 및 방법 ······································································ 9
1. 실험기재 ··················································································· 9
2. 실험방법 ················································································· 11
IV. 연구결과 ····················································································· 14
1. 크리스탈 팬텀을 이용한 실험 결과 ···································· 14
2. Chest Phantom을 이용한 실험 결과 ································ 23
Ⅴ. 고찰 및 결론 ·············································································· 27
참고문헌 ··························································································· 29
