• 제목/요약/키워드: positron

검색결과 697건 처리시간 0.032초

양전자 방출 단층촬영에서 폐암으로 의심되었던 고립 폐 결절 형태의 폐흡충증 1예 (A Case of Pulmonary Paragonimiasis Presented as Solitary Pulmonary Nodule and Suspected as Lung Cancer on 18F-Fluorodeoxyglucose Positron Emission Tomography)

  • 문재영;정기환;김제형;박형주;김영식;신철
    • Tuberculosis and Respiratory Diseases
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    • 제64권2호
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    • pp.133-137
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    • 2008

  • 폐흡충증은 폐흡충(Paragonimus westermani)의 중간 숙주인 민물 게, 민물 가재 등의 섭취를 통해 인체에 감염되는 기생충 질환으로, 기흉, 흉수, 낭성 종괴 등 다양한 임상 양상을 보인다. 고립 폐 결절로 형태로 발현하는 경우에는, 폐결핵 및 폐암 등과의 구분이 중요하다. 양전자 방출 단층촬영 검사가 감별 진단에 도움이 되지만, 폐결핵 및 폐 히스토플라스마종 등의 진균 감염에서의 위양성이 보고된 바 있다. 저자들은 48세 남자로 단순흉부촬영상 우연히 발견된 고립 폐 결절에 대한 평가 위해 내원한 환자에게서, 흉부 CT 및 FDG-PET에서 좌폐상엽의 폐문주위에 FDG 섭취가 증가된 고립 폐 결절 양상을 보여 폐암으로 의심하였으나, 폐엽 절제술을 시행 후 폐흡충증으로 진단하여 치료하였기에 문헌 고찰과 함께 보고하는 바이다.

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동시계수 양전자 소멸 측정에 의한 양성자 조사된 Si 구조 특성 (Proton Irradiated Cz-Si by the Coincidence Doppler Broadening Positron Annihilation Spectroscopy)

  • 이권희;이종용
    • 한국진공학회지
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    • 제20권5호
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    • pp.367-373
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    • 2011

  • 동시 계수 도플러 넓어짐 양전자 소멸 분광법으로 p형과 n형 실리콘 시료에 0, 4.0 MeV 에너지의 1.0, $2.0{\times}10^{13}$ protons/$cm^2$ 양성자 빔 조사에 의한 결함을 측정하여 실리콘 구조 특성에 대하여 조사하였다. 양전자와 전자의 쌍소멸로 발생하는 감마선 스펙트럼의 수리적 해석 방법인 S-변수와 W-변수를 사용하여, 시료의 구조 변화를 측정하였다. 본 연구에서 측정된 S-변수는 시료에 조사된 양성자의 빔 에너지에 따라 변하지 않고 거의 일정한 값을 보인 반면, 양성자 조사량의 변화에 따라 결함이 증가하였으며, 그 이유는 양성자 조사 에너지에 따른 Bragg 피크 때문에 에너지는 시료의 특정 깊이에 주로 결함을 형성하여 시료전체에는 결함으로 잘 나타나지 않기 때문으로 판단된다. 그리고 빔의 조사량에 따른 결함의 영향이 큰 것으로 나타났다.

  • https://doi.org/10.5757/JKVS.2011.20.5.367 인용 PDF KSCI

The Role of $^{18}F$-Fluorodeoxyglucose Positron Emission Tomography in the Treatment of Brain Abscess

  • Park, Seong-Hyun;Lee, Sang-Woo;Kang, Dong-Hun;Hwang, Jeong-Hyun;Sung, Joo-Kyung;Hwang, Sung-Kyoo
    • Journal of Korean Neurosurgical Society
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    • 제49권5호
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    • pp.278-283
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    • 2011

  • Objective : The purpose of this study was to evaluate whether $^{18}F$-fluorodeoxyglucose positron emission tomography (FOG-PET) can be used to assess the therapeutic response of brain abscess. Methods : A study was conducted on 10 consecutive patients with brain abscess, Magnetic resonance imaging (MRI) with diffuse-weighted imaging (DWI) was performed at 3 and 6 weeks after surgical treatment and intravenous antibiotics therapy and FOG-PET at 6 weeks after treatment. The extent of the abscess, signal changes on MRI, and FOG-PET standardized uptake values were analyzed and correlated with the response to therapy. Results : Aspiration or craniotomy with excision of the abscess followed by intravenous antibiotics for 6-8 weeks resulted in good recovery with no recurrence. In 10 patients, two had low signal intensity on the DWI; one had no uptake on FOG-PET imaging after 6 weeks antibiotics and discontinued intravenous treatment, but the other patient had diffuse, increased uptake on FOG-PET imaging after 6 weeks antibiotics and underwent an additional 2 weeks of intravenous antibiotics. The remaining eight patients had high signals on the DWI. Four had no uptake on FOG-PET imaging and the treatment period varied from 6 to 8 weeks (mean, 6.75 weeks). Among the other four patients, FOG was accumulated in a diffuse or local area corresponding to a high signal area within the DWI and 2 weeks of intravenous antibiotics was added. Conclusion : MRI plus FOG-PET improved the accuracy of assessing therapeutic responses to antibiotics treatment of brain abscess and aided in optimizing therapy.

  • https://doi.org/10.3340/jkns.2011.49.5.278 인용 PDF KSCI

The Unnecessity of Positron Emission Tomography Computed Tomography in the Etiologic Evaluation of Neurodevelopmental Delay in Craniosynostosis Patients

  • Yang, Chae Eun;Park, Eun Kyung;Lee, Myung Chul;Shim, Kyu Won;Kim, Yong Oock
    • 대한두개안면성형외과학회지
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    • 제18권1호
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    • pp.21-24
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    • 2017

  • Background: In evaluation of craniosynostosis patients in terms of neurodevelopmental delay, positron emission tomography computed tomography (PET-CT) scan can be used to assess brain abnormalities through glucose metabolism. We aimed to determine the unnecessity of PET-CT in this study. Methods: Thirty-eight patients diagnosed with craniosynostosis who underwent distraction osteogenesis from October, 2010 to November, 2013 were reviewed. Magnetic resonance imaging (MRI) and PET-CT scan were carried out for evaluation of the brain structure and function, whereas X-ray and CT scan were taken for evaluation of the skull. Results: Nine patients reported abnormal MRI findings which were not significant, and five patients showed local problem on brain on PET-CT scan. No correlation was found among them. Conclusion: PET-CT evaluation of possible abnormal brain findings do not affect surgical planning or require additional therapy. Preoperative PET-CT scan is not the essential study to get any etiologic information of the disease consequences or to establish the treatment plan.

  • https://doi.org/10.7181/acfs.2017.18.1.21 인용 PDF KSCI