• 제목/요약/키워드: Performance objective

검색결과 5,713건 처리시간 0.028초

Retrospective Electrocardiography-Gated Real-Time Cardiac Cine MRI at 3T: Comparison with Conventional Segmented Cine MRI

  • Chen Cui;Gang Yin;Minjie Lu;Xiuyu Chen;Sainan Cheng;Lu Li;Weipeng Yan;Yanyan Song;Sanjay Prasad;Yan Zhang;Shihua Zhao
    • Korean Journal of Radiology
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    • 제20권1호
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    • pp.114-125
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    • 2019
  • Objective: Segmented cardiac cine magnetic resonance imaging (MRI) is the gold standard for cardiac ventricular volumetric assessment. In patients with difficulty in breath-holding or arrhythmia, this technique may generate images with inadequate quality for diagnosis. Real-time cardiac cine MRI has been developed to address this limitation. We aimed to assess the performance of retrospective electrocardiography-gated real-time cine MRI at 3T for left ventricular (LV) volume and mass measurement. Materials and Methods: Fifty-one patients were consecutively enrolled. A series of short-axis cine images covering the entire left ventricle using both segmented and real-time balanced steady-state free precession cardiac cine MRI were obtained. End-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), ejection fraction (EF), and LV mass were measured. The agreement and correlation of the parameters were assessed. Additionally, image quality was evaluated using European CMR Registry (Euro-CMR) score and structure visibility rating. Results: In patients without difficulty in breath-holding or arrhythmia, no significant difference was found in Euro-CMR score between the two techniques (0.3 ± 0.7 vs. 0.3 ± 0.5, p > 0.05). Good agreements and correlations were found between the techniques for measuring EDV, ESV, EF, SV, and LV mass. In patients with difficulty in breath-holding or arrhythmia, segmented cine MRI had a significant higher Euro-CMR score (2.3 ± 1.2 vs. 0.4 ± 0.5, p < 0.001). Conclusion: Real-time cine MRI at 3T allowed the assessment of LV volume with high accuracy and showed a significantly better image quality compared to that of segmented cine MRI in patients with difficulty in breath-holding and arrhythmia.

아이트래커를 병행한 감각통합치료가 발달장애아동의 감각처리 및 시지각에 미치는 영향 (Effect of Sensory Integration Therapy Combined with Eye Tracker on Sensory Processing and Visual Perception of Children with Developmental Disabilities)

  • 권소현;안시내
    • 대한감각통합치료학회지
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    • 제21권3호
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    • pp.39-53
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    • 2023
  • 목적 : 본 연구는 발달장애아동에게 아이트래커를 병행한 감각통합치료가 감각처리 및 시지각에 미치는 효과를 알아보고자 하였다. 연구방법 : 본 연구의 설계는 단일대상연구의 대상자간 중다기초선 설계이며, 중재는 아이트래커를 병행한 감각통합치료를 적용하였다. 기초선 기간과 중재 기간의 매 회기 평가로 시각-운동 속도와 단속적 눈의 움직임을 평가하였으며, 사전·사후 평가로 감각프로파일, 한국판시지각발달검사, 선잇기검사를 실시하였다. 매 회기 평가와 사전·사후 평가는 시각적 분석 및 경향선 분석을 통해 중재의 효과를 연구하였다. 결과 : 회기별 평가 결과, 시각-운동속도와 단속적 눈의 움직임에서 모든 아동의 경향선 기울기가 기초선기간보다 중재기간에 급격하게 증가하였다. 사전·사후 평가결과, 감각처리에서는 움직임, 몸위치, 시각의 감각처리가 또래보다 많음에서 또래와 유사 수준으로 변화하였으며, 시지각에서는 모든 아동의 시각통합능력이 증가하였다. 또한, 아동의 시각추적 및 시각-운동 능력의 향상을 확인하기 위해 실시한 선잇기검사 결과, 모든 아동이 사전보다 사후에 수행시간이 감소하였다. 결론 : 발달장애아동의 아이트래커를 병행한 감각통합치료는 감각처리 및 시지각에 긍정적인 영향을 미쳤으며, 최근 기술의 향상과 스마트기기의 보급과 맞추어 아동의 흥미와 동기를 부여할 수 있어 임상적으로 중요한 역할을 할 것으로 사료된다.

Automatic Detection and Classification of Rib Fractures on Thoracic CT Using Convolutional Neural Network: Accuracy and Feasibility

  • Qing-Qing Zhou;Jiashuo Wang;Wen Tang;Zhang-Chun Hu;Zi-Yi Xia;Xue-Song Li;Rongguo Zhang;Xindao Yin;Bing Zhang;Hong Zhang
    • Korean Journal of Radiology
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    • 제21권7호
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    • pp.869-879
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    • 2020
  • Objective: To evaluate the performance of a convolutional neural network (CNN) model that can automatically detect and classify rib fractures, and output structured reports from computed tomography (CT) images. Materials and Methods: This study included 1079 patients (median age, 55 years; men, 718) from three hospitals, between January 2011 and January 2019, who were divided into a monocentric training set (n = 876; median age, 55 years; men, 582), five multicenter/multiparameter validation sets (n = 173; median age, 59 years; men, 118) with different slice thicknesses and image pixels, and a normal control set (n = 30; median age, 53 years; men, 18). Three classifications (fresh, healing, and old fracture) combined with fracture location (corresponding CT layers) were detected automatically and delivered in a structured report. Precision, recall, and F1-score were selected as metrics to measure the optimum CNN model. Detection/diagnosis time, precision, and sensitivity were employed to compare the diagnostic efficiency of the structured report and that of experienced radiologists. Results: A total of 25054 annotations (fresh fracture, 10089; healing fracture, 10922; old fracture, 4043) were labelled for training (18584) and validation (6470). The detection efficiency was higher for fresh fractures and healing fractures than for old fractures (F1-scores, 0.849, 0.856, 0.770, respectively, p = 0.023 for each), and the robustness of the model was good in the five multicenter/multiparameter validation sets (all mean F1-scores > 0.8 except validation set 5 [512 x 512 pixels; F1-score = 0.757]). The precision of the five radiologists improved from 80.3% to 91.1%, and the sensitivity increased from 62.4% to 86.3% with artificial intelligence-assisted diagnosis. On average, the diagnosis time of the radiologists was reduced by 73.9 seconds. Conclusion: Our CNN model for automatic rib fracture detection could assist radiologists in improving diagnostic efficiency, reducing diagnosis time and radiologists' workload.

Sonographic Assessment of the Extent of Extrathyroidal Extension in Thyroid Cancer

  • Sae Rom Chung;Jung Hwan Baek;Young Jun Choi;Tae-Yon Sung;Dong Eun Song;Tae Yong Kim;Jeong Hyun Lee
    • Korean Journal of Radiology
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    • 제21권10호
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    • pp.1187-1195
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    • 2020
  • Objective: This study aimed to determine the sonographic features suggestive of extrathyroidal extension (ETE) of thyroid cancers. Materials and Methods: We retrospectively reviewed the sonographic images of 1656 consecutive patients who had undergone thyroidectomy in 2017. The diagnostic performance of sonographic features suggestive of ETE was evaluated using operation and histopathologic reports. Sonographic features for gross ETE to the strap muscle and minor ETE were assessed for thyroid cancer abutting the anterolateral thyroid capsule. Sonographic features for tracheal invasion were assessed according to whether the angle between the tumor and the trachea was an acute, right, or obtuse angle. Sonographic features for recurrent laryngeal nerve (RLN) invasion were assessed based on the association between the tumor and tracheoesophageal groove (TEG) as preserved normal tissue, abutting or protruding into the TEG. Results: ETE was observed in 783 patients (47.3%), including 123 patients with gross ETE (7.4% [strap muscle, n = 97; RLN, n = 24; and trachea, n = 14]) and 660 patients with minor ETE (39.9%). Regarding the diagnosis of gross and minor ETE to the strap muscle, sonographic features of replacement of the strap muscle and capsular disruption showed the highest positive predictive value (75.9% and 58.5%, respectively). Thyroid cancer forming an obtuse angle with the trachea had the highest sensitivity for the diagnosis of tracheal invasion (85.7%), and thyroid cancer protrusion into the TEG showed the highest sensitivity for the diagnosis of RLN (83.3%). Conclusion: Sonography is considered beneficial in the diagnosis of ETE to the strap muscle, trachea, and RLN. Assessment of ETE is important for the accurate staging of thyroid cancer, which in turn determines the extent of surgery or whether active surveillance is appropriate or not.

CT Quantitative Analysis and Its Relationship with Clinical Features for Assessing the Severity of Patients with COVID-19

  • Dong Sun;Xiang Li;Dajing Guo;Lan Wu;Ting Chen;Zheng Fang;Linli Chen;Wenbing Zeng;Ran Yang
    • Korean Journal of Radiology
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    • 제21권7호
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    • pp.859-868
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    • 2020
  • Objective: To investigate the value of initial CT quantitative analysis of ground-glass opacity (GGO), consolidation, and total lesion volume and its relationship with clinical features for assessing the severity of coronavirus disease 2019 (COVID-19). Materials and Methods: A total of 84 patients with COVID-19 were retrospectively reviewed from January 23, 2020 to February 19, 2020. Patients were divided into two groups: severe group (n = 23) and non-severe group (n = 61). Clinical symptoms, laboratory data, and CT findings on admission were analyzed. CT quantitative parameters, including GGO, consolidation, total lesion score, percentage GGO, and percentage consolidation (both relative to total lesion volume) were calculated. Relationships between the CT findings and laboratory data were estimated. Finally, a discrimination model was established to assess the severity of COVID-19. Results: Patients in the severe group had higher baseline neutrophil percentage, increased high-sensitivity C-reactive protein (hs-CRP) and procalcitonin levels, and lower baseline lymphocyte count and lymphocyte percentage (p < 0.001). The severe group also had higher GGO score (p < 0.001), consolidation score (p < 0.001), total lesion score (p < 0.001), and percentage consolidation (p = 0.002), but had a lower percentage GGO (p = 0.008). These CT quantitative parameters were significantly correlated with laboratory inflammatory marker levels, including neutrophil percentage, lymphocyte count, lymphocyte percentage, hs-CRP level, and procalcitonin level (p < 0.05). The total lesion score demonstrated the best performance when the data cut-off was 8.2%. Furthermore, the area under the curve, sensitivity, and specificity were 93.8% (confidence interval [CI]: 86.8-100%), 91.3% (CI: 69.6-100%), and 91.8% (CI: 23.0-98.4%), respectively. Conclusion: CT quantitative parameters showed strong correlations with laboratory inflammatory markers, suggesting that CT quantitative analysis might be an effective and important method for assessing the severity of COVID-19, and may provide additional guidance for planning clinical treatment strategies.

Effect of feeding frequency on reproductive performances and stress responses in gestating sows

  • Sung-Woong Jung;Sungho Do;Jae-Cheol Jang;Jinsu Hong;Geonil Lee;Yoo Yong Kim
    • Journal of Animal Science and Technology
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    • 제66권1호
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    • pp.135-144
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    • 2024
  • The objective of this study was to investigate the influence of feeding frequency on a sow's reproductive performance and stress response during gestation. A total of twenty multiparous sows (Yorkshire × Landrace) were used in a completely randomized design based on their parity, body weight (BW), and backfat thickness (BFT), and the sows were allotted to two different feeding systems: 1) once daily feeding (OF) and 2) twice daily feeding (TF) in corn-soybean meal based diets. The gestation diet was formulated to contain 3,265 kcal of metabolizable energy (ME) / kg, 12.90% of crude protein (CP), and 0.75 % of total lysine. The lactation diet was formulated to contain 3,265 kcal of ME / kg, 16.80% of CP, and 1.08% of total lysine and provided ad libitum during lactation. In gestation, sow BFT and BF changes were not affected by feeding frequency, but higher BW and BW gain from day 35 to 90 and day 35 to 110 were observed in OF sow (p < 0.10). In lactation, feeding frequency did not influence on BW, BW gain, BFT, BF changes, average daily feed intake, and wean-to-estrus interval. Also, there were no differences in litter size, litter weight and piglet weight in lactating sows. OF sows had higher (p < 0.05; p < 0.10) protein, solid-not-fat, and total solid concentrations in colostrum compared to TF sows, while OF sows had a lower (p < 0.05) lactose concentration in colostrum compared to TF sows. Sows in OF showed significantly lower average daily water consumption (ADWC) from day 35 to 110 of gestation (p < 0.05). While there were no significant differences in stereotypic behaviors and salivary cortisol levels during gestation between treatments, the OF sows showed less time spending on the activity at day 105 (p < 0.05). In conclusion, reduced feeding frequency increased BW gain during gestation, decreased activation time, and changed the colostrum composition. This information may contribute to the understanding of the physiological and behavioral change of gestating sows by manipulating feeding frequency.

중고령 노인의 개인적 가치에 따른 라이프스타일 분류: 머신러닝을 활용한 상대적 중요도 분석 (Identifying Personal Values Influencing the Lifestyle of Older Adults: Insights From Relative Importance Analysis Using Machine Learning)

  • 임승주;박지혁
    • 재활치료과학
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    • 제13권2호
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    • pp.69-84
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    • 2024
  • 목적 : 노인의 건강한 삶의 방식으로서 라이프스타일에 대한 연구가 증가하고 있다. 라이프스타일이 개개인의 가치와 삶의 태도를 반영하는 개념임에도 불구하고, 아직까지 개인의 어떠한 가치가 라이프스타일을 건강하게 유도하는지 파악한 연구는 부족한 실정이다. 이에 본 연구는 노인의 라이프스타일 유형을 두 가지로 분류하고, 머신러닝을 활용하여 어떠한 개인적 가치가 건강한 라이프스타일에 우선적으로 작용하는지 파악하고자 한다. 연구방법 : 본 연구는 지역사회에 거주하는 55세 이상 중고령 노인 300명을 대상으로 횡단 연구를 수행하였다. 라이프스타일은 Yonsei Lifestyle Profile-Active, Balanced, Connected, Diverse (YLP-ABCD) 응답을 사용하여 잠재프로파일 분석을 통해 유형화하였다. 라이프스타일 유형을 예측하는 개인적 가치는 YLP-V (Values) 응답을 수집하여, 예측성능이 가장 높은 머신러닝 알고리즘을 선정한 후 상대적 중요도를 파악하였다. 결과 : 잠재프로파일 분석 결과, 라이프스타일은 건강한 라이프스타일 실천형(48.87%), 비실천형(51.13%)으로 분류되었다. 실천형에 속한 중고령 노인은 비실천형에 비해 사회관계가 활발한 특성을 나타내었다. 본 연구에 포함된 머신러닝 알고리즘 중 가장 우수한 성능을 보인 모델은 서포트 벡터 머신으로, 정확도 96%, Receiver Operating Characteristic (ROC) 영역 95%로 나타났다. 본 알고리즘을 바탕으로 개인적 가치의 상대적 중요도를 분석한 결과, 건강한 식단, 건강 매체, 여가활동, 건강 제품 및 머신러닝에 주의를 기울일수록, 해당 가치에 따라 중고령 노인은 건강한 라이프스타일을 실천하는 그룹에 속할 가능성이 큰 것으로 나타났다. 결론 : 본 연구는 중고령 노인의 사회적 관계망을 포함한 건강한 라이프스타일을 유도하기 위해, 건강 식단, 매체, 여가, 제품 및 습관에 대한 가치 향상을 중점적으로 다루는 종합적인 프로그램 및 서비스의 필요성을 시사한다.

성인 발달장애인 대상 수단적 일상생활활동 작업치료 프로그램이 일상생활활동 및 삶의 질에 미치는 영향 (Impact of an Instrumental Daily Living Activities Occupational Therapy Program for Adults With Developmental Disabilities on Their Daily Living Activities and Quality of Life)

  • 정은화
    • 재활치료과학
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    • 제13권2호
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    • pp.85-94
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    • 2024
  • 목적 : 본 연구는 성인 발달장애인을 대상으로 수단적 일상생활활동 프로그램을 제공하였을 때 일상생활활동 및 삶의 질에 미치는 영향을 확인하고자 하였다. 연구방법 : 본 연구는 단일집단 사전-사후 실험설계로, E 장애인복지관의 성인 발달장애인 17명을 대상으로 시행하였다. 프로그램은 사전-사후 평가를 포함하여 총 10회기로 이루어졌으며, 장보기, 식사준비 및 정리, 가정관리, 안전 및 응급관리와 관련된 훈련 및 교육을 제공하였다. 평가도구는 삶의 질 설문지(Quality of Life: QOL), 한국어판 생활공간 평가(Korean version of the Life Space Assessment: K-LSA), 한국어판 수단적 일상생활활동(Korean version of the Instrumental Activities of Daily Living: K-IADL)을 사용하였다. 결과 : 수단적 일상생활활동 작업치료 프로그램 전과 후의 QOL과 K-IADL 점수에서 통계적으로 유의한 차이가 나타났으며, K-LSA 점수는 통계적으로 유의한 차이가 없었다. 결론 : 본 연구는 성인 발달장애인 대상으로 수단적 일상생활활동 프로그램을 시행함으로써 수단적 일상생활활동 수행도와 삶의 질에 긍정적인 영향을 주는 것을 확인하였다. 성인 발달장애인의 일상생활 및 사회참여를 영위하기 위해 일상생활활동 훈련을 포함한 작업참여의 중재가 확대되어야 한다.

보존지역의 합리적 관리를 위한 철새 서식 확률지도 구축 - 부산 Eco Delta City (EDC)를 중심으로 - (Probability Map of Migratory Bird Habitat for Rational Management of Conservation Areas - Focusing on Busan Eco Delta City (EDC) -)

  • 김근한;공석준;김희년;구경아
    • 한국환경복원기술학회지
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    • 제26권6호
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    • pp.67-84
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    • 2023
  • In some areas of the Republic of Korea, the designation and management of conservation areas do not adequately reflect regional characteristics and often impose behavioral regulations without considering the local context. One prominent example is the Busan EDC area. As a result, conflicts may arise, including large-scale civil complaints, regarding the conservation and utilization of these areas. Therefore, for the efficient designation and management of protected areas, it is necessary to consider various ecosystem factors, changes in land use, and regional characteristics. In this study, we specifically focused on the Busan EDC area and applied machine learning techniques to analyze the habitat of regional species. Additionally, we employed Explainable Artificial Intelligence techniques to interpret the results of our analysis. To analyze the regional characteristics of the waterfront area in the Busan EDC district and the habitat of migratory birds, we used bird observations as dependent variables, distinguishing between presence and absence. The independent variables were constructed using land cover, elevation, slope, bridges, and river depth data. We utilized the XGBoost (eXtreme Gradient Boosting) model, known for its excellent performance in various fields, to predict the habitat probabilities of 11 bird species. Furthermore, we employed the SHapley Additive exPlanations technique, one of the representative methodologies of XAI, to analyze the relative importance and impact of the variables used in the model. The analysis results showed that in the EDC business district, as one moves closer to the river from the waterfront, the likelihood of bird habitat increases based on the overlapping habitat probabilities of the analyzed bird species. By synthesizing the major variables influencing the habitat of each species, key variables such as rivers, rice fields, fields, pastures, inland wetlands, tidal flats, orchards, cultivated lands, cliffs & rocks, elevation, lakes, and deciduous forests were identified as areas that can serve as habitats, shelters, resting places, and feeding grounds for birds. On the other hand, artificial structures such as bridges, railways, and other public facilities were found to have a negative impact on bird habitat. The development of a management plan for conservation areas based on the objective analysis presented in this study is expected to be extensively utilized in the future. It will provide diverse evidential materials for establishing effective conservation area management strategies.

텍스트 마이닝을 활용한 OTT 서비스 플랫폼별 사용자 반응 비교 연구 (Comparative Study of User Reactions in OTT Service Platforms Using Text Mining)

  • 권순찬;김지은;장백철
    • 인터넷정보학회논문지
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    • 제25권3호
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    • pp.43-54
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    • 2024
  • 본 연구는 텍스트 마이닝 기법을 활용하여 다양한 OTT(Over-The-Top) 서비스 플랫폼에 대한 사용자 반응을 비교한다. 연구의 주요 목표는 OTT 서비스 플랫폼의 사용자 만족도를 파악하여 보다 효과적인 리뷰 전략을 수립하는 데 기여하는 것이다. 본 연구에서 다루는 주요 질문에는 다양한 OTT 서비스에 대한 사용자 리뷰에서 두드러진 토픽과 키워드를 식별하고 플랫폼별 사용자 반응을 이해하는 것이 포함된다. 이를 위해 긍정, 부정 리뷰에서 중요 단어를 추출하기 위해 Tf-idf를, 복잡한 사용자 리뷰를 보다 정교하고 포괄적으로 분석하기 위해 고급 토픽 모델링 기법인 BERTopic을 사용한다. Tf-idf 분석한 결과, 앱에 대한 긍정 리뷰는 콘텐츠와 관련된 단어들의 수치가 높았으며 부정 리뷰에서는 앱 사용 과정에서 발생할 수 있는 문제점에 관한 단어 수치가 높게 기록되었다. BERTopic을 활용한 토픽 모델링에서는 콘텐츠의 속성과 연관 지어 콘텐츠의 다양성, 앱 성능 요소, 결제, 호환성에 관한 키워드를 도출하였으며, 플랫폼 별로 두각을 보이는 속성이 다르다는 점도 확인하였다. 본 연구 결과는 사용자 행동과 선호도에 대한 중요한 인사이트를 제공하며, 이를 통해 OTT 서비스 제공업체는 사용자 경험과 만족도를 개선하는 데 활용할 수 있다. 또한, 연구자들은 사용자 리뷰 텍스트 분석에서 딥러닝 모델을 활용한 연구의 아이디어를 얻을 수 있을 것이라 기대한다.