• 제목/요약/키워드: Radiology loading

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Utilities and Limitations of Cardiac Magnetic Resonance Imaging in Dilated Cardiomyopathy

  • Min Jae Cha;Yoo Jin Hong;Chan Ho Park;Yoon Jin Cha;Tae Hoon Kim;Cherry Kim;Chul Hwan Park
    • Korean Journal of Radiology
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    • 제24권12호
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    • pp.1200-1220
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    • 2023

  • Dilated cardiomyopathy (DCM) is one of the most common types of non-ischemic cardiomyopathy. DCM is characterized by left ventricle (LV) dilatation and systolic dysfunction without coronary artery disease or abnormal loading conditions. DCM is not a single disease entity and has a complex historical background of revisions and updates to its definition because of its diverse etiology and clinical manifestations. In cases of LV dilatation and dysfunction, conditions with phenotypic overlap should be excluded before establishing a DCM diagnosis. The differential diagnoses of DCM include ischemic cardiomyopathy, valvular heart disease, burned-out hypertrophic cardiomyopathy, arrhythmogenic cardiomyopathy, and non-compaction. Cardiac magnetic resonance (CMR) imaging is helpful for evaluating DCM because it provides precise measurements of cardiac size, function, mass, and tissue characterization. Comprehensive analyses using various sequences, including cine imaging, late gadolinium enhancement imaging, and T1 and T2 mapping, may help establish differential diagnoses, etiological work-up, disease stratification, prognostic determination, and follow-up procedures in patients with DCM phenotypes. This article aimed to review the utilities and limitations of CMR in the diagnosis and assessment of DCM.

  • https://doi.org/10.3348/kjr.2023.0531 인용 PDF

환자에게 주는 선량을 감소시켜주는 니오비움 필터의 대체물로서의 저렴한 알루미늄 필터 (Aluminum Equivalent Filter As an Inexpensive Alternative to the Niobium Filter in Reducing Patient Dose)

  • Kim, Chang-Sean
    • 한국의학물리학회지:의학물리
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    • 제6권2호
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    • pp.3-12
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    • 1995

  • 두께가 50 $\mu\textrm{m}$인 니오비움 필터와 정량적으로 대등하게 결정된 알루미늄 필터를 입사표면 선량, 영상의 질, X-선관에 걸리는 부하를 진단 방사선의 에너지 영역에서 평가하였다. 입사 표면 선량의 감쇠와 선관에 걸리는 부하의 증가를 비교해 볼 때 두 경우에 특이할 만한 큰 차이가 없었고 이 때 필름상의 화상의 대조도는 일정하게 유지 시켰다. 임상에서 알루미늄 필터를 니오비움 필터로 대용하기 위하여 진단 방사선의 에너지 영역의 중간지점, 90 kVp, 에서 대등한 알루미늄 필터의 두께를 측정하였고 이 필터를 73 kVp 와 125 kVp에 적용시켜 입사 표면 선량과 X-선관에 걸리는 부하를 비교 평가하였다. 선택된 두 kVp에서 두 필터의 경우에 특이할 만한 차이는 없었다. 니오비움과 대등한 두께의 알루미늄 필터는 니오비움 필터의 저렴한 대체물로 쓰일 수 있다.

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디지털방사선영상에서 추출한 해면질골의 강도와 미세구조의 형태계측학적 분석에 대한 연구 (A study of trabecular bone strength and morphometric analysis of bone microstructure from digital radiographic image)

  • 한승윤;이선복;오성욱;허민석;이삼선;최순철;박태원;김종대
    • Imaging Science in Dentistry
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    • 제33권2호
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    • pp.113-119
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    • 2003

  • Purpose : To evaluate the relationship between morphometric analysis of bone microstructure from digital radiographic image and trabecular bone strength. Materials and Methods : One hundred eleven bone specimens with 5 mm thickness were obtained from the mandibles of 5 pigs. Digital images of specimens were taken using a direct digital intraoral radiographic system. After selection of ROI (100 × 100 pixel) within the trabecular bone, mean gray level and standard deviation were obtained. Fractal dimension and the variants of morphometric analysis (trabecular area, periphery, length of skeletonized trabeculae, number of terminal point, number of branch point) were obtained from ROI. Punch sheer strength analysis was performed using Instron (model 4465, Instron Corp., USA). The loading force (loading speed 1 mm/min) was applied to ROI of bone specimen by a 2 mm diameter punch. Stress-deformation curve was obtained from the punch sheer strength analysis and maximum stress, yield stress, Young's modulus were measured. Results: Maximum stress had a negative linear correlation with mean gray level and fractal dimension significantly (p<0.05). Yield stress had a negative linear correlation with mean gray level, periphery, fractal dimension and the length of skeletonized trabeculae significantly (p < 0.05). Young's modulus had a negative linear correlation with mean gray level and fractal dimension significantly (p < 0.05). Conclusions : The strength of cancellous bone exhibited a significantly linear relationship between mean gray level, fractal dimension and morphometric analysis. The methods described above can be easily used to evaluate bone quality clinically.

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여성 요도암의 원격조정 고선량 근접치료 (Remote After Loading HDR Brachytherapy for Female Urethral Cancer)

  • 조정길;최은경;장혜숙;이병용;김광훈;이종구
    • Radiation Oncology Journal
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    • 제9권2호
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    • pp.319-324
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    • 1991

  • 여성 뇨도암은 극히 드문 종양으로 그 치료법에 대해서는 수술과 방사선 치료가 주종을 이룬다. 본원에서 micro Selectron ${I_r}-192$를 이용하여 원격조정 고선량 근접치료를 시행했는데 시술의 기술적인 측면을 소개하고 문헌고찰을 기술한다.

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