• Title/Summary/Keyword: Radiology loading

Search Result 26, Processing Time 0.023 seconds

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
    • /
    • v.24 no.12
    • /
    • pp.1200-1220
    • /
    • 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

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

  • Kim, Chang-Sean
    • Progress in Medical Physics
    • /
    • v.6 no.2
    • /
    • pp.3-12
    • /
    • 1995

  • A 50 $\mu\textrm{m}$ thick niobium filter and its quantitatively determined aluminum equivalent filter were evaluated for effects on entrance skin dose, image quality, and x-ray tube loading for three different tube voltages in radiology. There was no significant difference in the reducion in entrance skin dose and increase in tube loading between two filters while keeping radiographic contrast on the film. For the clinical use of the aluminum equivalent filter as an alternative to the niobium filter in radiology, aluminum equivalent filter thickness at the mid energy range of radiology, 90 kVp, was measured and the filter was applied to the other kVp values, 73 and 125 kVps, to evaluate the effect on the entrance skin dose and tube loading. There was no significant difference between two filter cases at the selected kVp. The aluminum filter with equivalent thickness can be used as an inexpensive alternative to the niobium filter.

  • PDF

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

  • Han Seung-Yun;Lee Sun-Bok;Oh Sung-Ook;Heo Min-Suk;Lee Sam-Sun;Choi Soon-Chul;Park Tae-Won;Kim Jong-Dae
    • Imaging Science in Dentistry
    • /
    • v.33 no.2
    • /
    • pp.113-119
    • /
    • 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.

  • PDF

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

  • Cho Jeong Gil;Choi Eun Kyung;Chang Hyesook;Yi Byong Yong;Kim Kwang Hoon;Lee Jong Goo
    • Radiation Oncology Journal
    • /
    • v.9 no.2
    • /
    • pp.319-324
    • /
    • 1991

  • In our institution, a 76-year-old woman with primary urethral carcinoma was treated with remote afterloading high dose rate (HDR) interstitial brachytherapy using micro selectron Ir-192. In this paper, authors described the technical aspect of remote afterloading HDR interstitial brachytherapy for female urethal cancer.

  • PDF