Diagnostic Imaging of Isolated Splenic Torsion in a German Shepherd Dog

이기자,정성목,최호정,이영원 한국임상수의학회 2011 한국임상수의학회지 Vol.28 No.6

A 5-year-old male German shepherd dog was presented with a 4 day-history of anorexia and depression. Abdominal radiographs showed a large soft tissue mass and loss of serosal detail. Ultrasonographs revealed splenomegaly with the lacy pattern parenchyma, perivenous hyperechoic region at the splenic hilum, and loss of splenic venous flow. Computed tomographic findings included the enlarged non-enhanced spleen except perivenous region at the splenic hilum and a whirled soft tissue mass at the splenic hilum. Exploratory laparotomy confirmed the diagnosis of splenic torsion. Ultrasonographic findings including lacy appearance, hyperechoic perivenous echogenicity and absence of splenic blood flow and CT findings including no or minimal enhancement of the spleen and a whirled appearance of splenic pedicle could be useful for diagnosing isolated splenic torsion in the dog.

Magnetic Resonance Characteristics of Ischemic Brain Infarction in Three Dogs

이기자,김영환,최성진,최수영,정인성,최호정,이영원 한국임상수의학회 2014 한국임상수의학회지 Vol.31 No.5

This case study describes the magnetic resonance characteristics of brain infarction in three dogs. Locationsof the brain infarcts were cerebella, thalamus, and multifocal. The infarcts were sharply demarcated from adjacentbrain parenchyma, homogeneous, T1-hypointense, T2-hyperintense with/without contrast enhancement, and minimalor no mass effect. Diffusion-weighted imaging (DWI) sequences were available in a dog and the infarcts werehyperintense on DWI and were hypointense on the apparent diffusion coefficient map.

비색 종이 센서를 이용한 현장형 황화수소 분석 장치 개발

이기자,나유리,이재철 한국정밀공학회 2024 한국정밀공학회지 Vol.41 No.1

In this study, a highly sensitive analysis device for hydrogen sulfide that could be used quickly and easily on site was developed using a colorimetric paper sensor. To optimize analysis conditions, tests were performed for each function. Performances of the method using laboratory equipment and tools and the method using the developed device for hydrogen sulfide analysis were compared. The trend line of changes in parameter b of the image acquired by the on-site analytical device for hydrogen sulfide was calculated as y = 0.517x - 0.141 with a coefficient of determination (R2) of 0.9874. It was comparable to the method performed at the laboratory level, showing an excellent linearity. Using the calculated trend line as a calibration curve, the detection limit and quantification limit were found to be 2.386 μM and 7.952 μM, respectively. A reproducibility test showed a relative standard deviation of 5.7%, indicating a low dispersion of results.

Computed Tomography and Magnetic Resonance Imaging Features of Spinal Chondrosarcoma in a Cat

이기자 한국임상수의학회 2024 한국임상수의학회지 Vol.41 No.2

An 8-year-old, spayed female Persian cat weighing 3.6 kg presented with a lumbosacral mass and bilateral weight bearing hindlimb lameness. Computed tomography (CT) and magnetic resonance imaging (MRI) revealed a dumbbell-shaped heterogeneous mass extending through the internal surface of the ileum and surrounding the lumbosacral junction. CT also revealed extensive osteoproliferation and bone lysis of the sacrum, but no evidence of any pulmonary metastasis. Furthermore, MRI revealed a focal area in the spinal cord showing connection with the adjacent tumor, suggesting tumor invasion into the spinal cord. Low-grade myxoid chondrosarcoma was histopathologically diagnosed. This is the first report describing CT and MRI findings of spinal cord chondrosarcoma in veterinary medicine. This study suggests that combining CT with MRI is a more sensitive tool for evaluating spinal tumors than using CT or MRI alone.

Computed Tomographic Evaluation of the Nasal Septum Deviation in Clinically Normal Dogs

이기자,이인,이희천,한우석,최호정,이영원 한국임상수의학회 2011 한국임상수의학회지 Vol.28 No.5

This study was performed to determine a comprehensive anatomic variation and deviation of the nasal septum in clinically normal dogs by use of computed tomography (CT). The nasal septum was evaluated in 36 shihtzu dogs and 16 beagle dogs. A degree of a septal deviation was evaluated by measuring a maximum angle and a distance of the septal deviation. The angle and distance of the septal deviation were significantly higher in shih-tzu dogs than in beagle dogs. There was no significant relationship between body weight and age and all measurements (angle and distance) in both breed dogs. Results of this study suggest that nasal septum deviation and its defect are observed on CT images of clinically normal dogs, especially in shih-tzu dogs.

컴퓨터단층촬영술과 자기공명영상을 이용한 두개강내 지주막낭종의 진단 4례

이기자,이재연,정기현,지현철,박성준,최호정,정성목,이영원 한국임상수의학회 2006 한국임상수의학회지 Vol.23 No.3

Pomeranian에서 발생한 치주 질환에 의한 비염 1례

이기자,최윤정,최형준,이용진,최호정,이영원,정성목 忠南大學校 獸醫科大學 動物醫科學硏究所 2005 動物醫科學硏究誌 Vol.13 No.-

A 10-year-old spayed female dog with history of persistent nasal discharge and halitosis was presented. In oral examination, there were severe dental calculi and gingivitis. The radiographic imaging showed lesions of left nasal cavity and periodontal membrane. In computed tomographic imaging, there are increased density of left nasal cavity, loss of nasal concha and partial defect of nasal septum. Many inflammatory cells were observed in nasal cytology. The result of culture from nasal smear was negative. All these findings result in rhinitis by dental calculi and gingivitis. The dog got improved after scaling, tooth extraction, and medical treatment.

Quantification of Experimentally Induced-Pleural Effusion in Beagle Dogs: Radiography versus CT and Ultrasonography

이기자,오이세,정성목,이희천,박성준,이영원,최호정 한국임상수의학회 2008 한국임상수의학회지 Vol.25 No.2

This study was performed to quantify the pleural effusion in radiography, ultrasonography and computed tomography(CT) and to evaluate and compare the usefulness of these methods. Normal saline of 10 ml/kg was infused into the pleural space until a final loading volume of 60 ml/kg body weight was reached in six Beagle dogs. The radiographic examination was performed for the detection and quantification of pleural effusion. On the ultrasonographic study, the maximum perpendicular distance was measured between the surface of the lung and the thoracic wall to evaluate pleural effusion. On the CT image, pleural effusion was evaluated as the perpendicular distance to the thoracic surface in the maximum pleural effusion volume on any transverse images with soft tissue window. Statistical analysis was performed using linear regression test. The volume of pleural effusion and measurements of radiography and ultrasonography had no statistical relationship. However, a significant correlation was identified between the volume of pleural effusion and the depth at right (r2= 0.715), left (r2= 0.745), and mean right and left depth (r2= 0.844) on the CT images. All of the thoracic radiographs, ultrasonography, and CT are useful in recognition of pleural effusion. In quantification of pleural effusion, the CT measurement method is superior to radiographic and ultrasonographic measurements.

개에서 자기공명영상을 이용한 뇌수두증과 척수공동증 진단

이기자,최수영,오이세,최호정,이영원 로얄에이알씨 주식회사 2007 로얄동물임상의학 Vol.- No.-

Syringomyelia는 척수 내에 액체로 찬 공간이 존재하는 것을 말하며, Hydromyelia란 척수중심관의 확장을 뜻한다. 하지만 영상진단학적으로 Syringomyelia와 Hydromyelia의 구분은 어려우며 보통 이들을 통틀어 척수공동증(syringohydromyelia)이라 부른다. 척수공동증의 원인은 정확히 밝혀지지 않았으나, 선천적 척추 기형 혹은 뇌척수액의 흐름 및 흡수 장애에 의해 발생한다는 보고가 있다. 특히 카베일러 킹 찰스 스패니얼(Cavalier King Charles Spaniel)에서 후두골의 기형 및 소뇌탈출(cerebellar herniation)과 병발하여 척수공동증의 발생 빈도가 높은 것으로 보고되어 있다. 임상증상은 병변의 위치 및 병발 질병에 따라 다양하며 주로 통증 또는 사지의 신경계 증상을 유발한다.

개에서 내측슬개골 탈구 등급에 따른 고관절 이상과의 상관관계에 대한 방사선학적 평가

이기자,박은정,권영항,최호정,이영원 한국임상수의학회 2013 한국임상수의학회지 Vol.30 No.4

This study was performed in 41 dogs with unilateral or bilateral medial patella luxation (MPL) and/or cranial cruciate ligament rupture (CCLR). These dogs were classified into 4 groups according to MPL grading system. Radiographic evaluation was performed for pelvis and stifle joint in the dogs. Norberg, inclination, quadriceps and femoral varus angle were measured and analyzed with MPL grading and the existence of cranial cruciate ligament rupture. The Norberg and inclination angle showed no differences between 4 grading groups and between CCLR and no CCLR groups. However, quadriceps and femoral varus angle were statistically different between grade 1, 2 and grade 3, 4 groups. They also have shown the statistical difference between CCLR and no CCLR group. Further studies for how these parameters affect the prognosis and the results of surgical treatment of MPL should be needed.