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Sooyoung Lee,배승빈,Hakjae Lee,Kwangdon Kim,Kisung Lee,Kyeong-Min Kim,Jae Keon Bae 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.11
A-PET is a quad-head PET scanner developed for use in small-animal imaging. The dimensions of its volumetric field of view (FOV) are 46:1 46:1 46:1 mm3 and the gap between the detector modules has been minimized in order to provide a highly sensitive system. However, such a small FOV together with the quad-head geometry causes image quality degradation. The main factor related to image degradation for the quad-head PET is the mispositioning of events caused by the penetration effect in the detector. In this paper, we propose a precise method for modelling the system at the high spatial resolution of the A-PET using a LOR (line of response) based ML-EM (maximum likelihood expectation maximization) that allows for penetration effects. The proposed system model provides the detection probability of every possible ray-path via crystal sampling methods. For the ray-path sampling, the sub-LORs are defined by connecting the sampling points of the crystal pair. We incorporate the detection probability of each sub-LOR into the model by calculating the penetration effect. For comparison, we used a standard LOR-based model and a Monte Carlo-based modeling approach, and evaluated the reconstructed images using both the National Electrical Manufacturers Association NU 4-2008 standards and the Geant4 Application for Tomographic Emission simulation toolkit (GATE). An average full width at half maximum (FWHM) at different locations of 1.77 mm and 1.79 mm are obtained using the proposed system model and standard LOR system model, which does not include penetration effects, respectively. The standard deviation of the uniform region in the NEMA image quality phantom is 2.14% for the proposed method and 14.3% for the LOR system model, indicating that the proposed model out-performs the standard LOR-based model.
Imaging Characteristics of Perosomus elumbis in a Puppy
Sooyoung Choi,Byungho Lee,Byungdon Lee,Jiwon Seo,Hyunyoung Park,Kyunghun Kwon,Youngwon Lee,Hojung Choi 한국수정란이식학회 2015 한국동물생명공학회지 Vol.30 No.4
A 4-day-old, male Poodle dog was presented with dull, depressed and exhausted activity after the birth. On physical examination, the puppy showed arthrogryposis, muscular atrophy and no movement of hindlimbs. Palpation on dorsum revealed an absence of lumbar and sacral vertebrae. On prenatal and postnatal radiography, lumbar vertebrae, sacrum and coccygeal vertebrae were not visualized. On ultrasonography, bilateral kidney and urinary bladder were observed. On computed tomography, there were no apparent abnormalities in the forelimbs, cervical vertebrae or head, while lumbar vertebrae, sacrum and coccygeal vertebrae were not observed. At necropsy examination, the liver, stomach, intestine, kidney and urinary bladder were normal. This congenital anomaly was consistent with Perosomus elumbis. Perosomus elumbis in dogs is a rare condition of unknown etiology. In this report, Perosomus elumbis was evaluated with radiography, ultrasound and computed tomography.
Imaging Characteristics of Perosomus elumbis in a Puppy
Sooyoung Choi,Byungho Lee,Byungdon Lee,Jiwon Seo,Hyunyoung Park,Kyunghun Kwon,이영원,최호정 사단법인 한국동물생명공학회 2015 한국동물생명공학회지 Vol.30 No.4
A 4-day-old, male Poodle dog was presented with dull, depressed and exhausted activity after the birth. On physical examination, the puppy showed arthrogryposis, muscular atrophy and no movement of hindlimbs. Palpation on dorsum revealed an absence of lumbar and sacral vertebrae. On prenatal and postnatal radiography, lumbar vertebrae, sacrum and coccygeal vertebrae were not visualized. On ultrasonography, bilateral kidney and urinary bladder were observed. On computed tomography, there were no apparent abnormalities in the forelimbs, cervical vertebrae or head, while lumbar vertebrae, sacrum and coccygeal vertebrae were not observed. At necropsy examination, the liver, stomach, intestine, kidney and urinary bladder were normal. This congenital anomaly was consistent with Perosomus elumbis. Perosomus elumbis in dogs is a rare condition of unknown etiology. In this report, Perosomus elumbis was evaluated with radiography, ultrasound and computed tomography.
IgE-mediated food allergies in children: prevalence, triggers, and management
Lee, Sooyoung The Korean Pediatric Society 2017 Clinical and Experimental Pediatrics (CEP) Vol.60 No.4
Food allergy (FA) is a serious health problem, and severe FA such as food-induced anaphylaxis can often be life threatening. The incidence of FA has been increasing especially in children. They usually develop early in life and affect up to 10% of children. The 2 most common food allergens worldwide are milk and eggs, while the third one varies depending on the countries: peanuts in the United States and Switzerland, wheat in Germany and Japan, tree nuts in Spain, sesame in Israel, and walnuts in Korea. These common food allergens are different and difficult to identify because of differing study methodologies, population, geography, age, and dietary exposure patterns. The current management of FA relies on the strict avoidance of culprit allergens, the prompt treatment of allergic reactions, including epinephrine use for food-induced anaphylaxis, monitoring, and education to prevent further reactions. Newer approaches for tolerance induction to FA and FA immunotherapy have been under investigation but are not yet ready for real-world application. Thus, consistent and systematic education of patients, caregivers, and food-handling people is of primary importance for the management and prevention of FA reactions. This review assesses and compares IgE-mediated FA in children in Korea and other countries, with a focus on summarizing the prevalence, common triggers, and management of FA.
Sooyoung Lee 한국아메리카학회 2018 美國學論集 Vol.50 No.1
A Justin Lin’s debut film Better Luck Tomorrow (2002), dubbed as the first real mainstream Asian American cinema, features overachieving Asian American teens in upper-middle class suburban areas who dabbled in series of petty criminal activities and ended up becoming murderers. Despite controversies over the negative portray of Asian Americans commonly perceived as a “model minority,” its success with mainstream audiences is attributed to its adoption of Hollywood mainstream generic conventions and its stylish actors in roles usually reserved white leads. This paper examines Lin’s strategies to slot a new generation of Asian American male characters into the familiar Hollywood cliché deeply associated with white-centered hegemonic masculinity constituted through youth violence and crime. As a result, what Lin is really doing for this young Asian Americans, is to enable them to shrug off ‘Asian’ tag and makes them reverse the order of identity; masculine first and model minority Asian kids after.
Between "Gibson Girl" and "Flapper"
Sooyoung Lee 한국영미어문학회 2013 영미어문학 Vol.- No.107
This study examines how Winnifred Eaton, better known by her penname Onota Watanna, presented her image in published photographs and her purported autobiographical novel, Me: A Book of Remembrance, by positioning herself under the discourses of the American "New Woman." At the turn of the century in America, the New Women were symbols of modernity and an upper level in the evolutionary sense, represented in the figure of the Gibson girl. However, there was also a concern about the emergence of a young, urban, single, working girl threatening the middle class home, represented later in popular culture as a flapper. Under the divided discourses around the new woman, Watanna skillfully becomes an icon of a young American modern woman and avoids the dangers of being excluded from the categorization because of her racial and class disadvantages as a half-Asian woman writer. These strategies, in reality, contributed to her assimilation into the dominant literary society as an American woman writer.