• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.705-708
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• 1988

Ultrasound Doppler Diagnostic System utilizes the Doppler effect for measurement of blood velocity. The sign of the Doppler frequency shift represents blood flow direction. Pulsed Doppler System uses Phase detector and zerocrossing method to produce simultaneous independent audio and velocity signals for forward and reverse blood flow direction in the time domain, had been fabricated. But time-domain analyzing such as audio evaluation and zerocrossing detection for instantaneous and mean frequency measurement doesn't, provide both an accurate and quantitative result. Therefore, it is necessary to adopt frequency domain technique to improve system performance. In this paper, we describe a unit which is composed of Pulsed Doppler System and real-time spectrum analyzer (installed TMS 32010 DSP Chip). This unit shows time-dependent spectrum variation and mean velocity of blood Signal.

• Journal of Korea Technology Innovation Society
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• v.6 no.2
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• pp.228-252
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• 2003

This research has been focused upon and analyzing Medison, once a leading New Technology-Based Finn (N1BF) in Korea with exceptionally advanced technology in 3D ultrasound diagnostic imaging devices (UDIDs) (armored with 23 subsidiaries at its peak expansion), from the perspective of Dynamic Finn Capability(DFC). The underlying hypothesis is that the various problems from its pointless pursuit of the business styles or precedents of the existing large firms might be traced to its specific characteristics as an NTBF, which should have more preferably been based upon the distinctive competences such as differentiated technologies, institutional linkages, organizational routines, and complementary assets, etc. In conclusion, for the NTBFs with different DFC domains from those of the large firms, the optimal external linkages and comprehensive integration efforts (Process) under their specific organizational characteristics and constraints (path) are highly recommended for the continuous accumulation of their core capabilities based upon the technological assets (Position).

• Tuberculosis and Respiratory Diseases
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• v.40 no.4
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• pp.353-356
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• 1993

Advent of new imaging modalities such as computed tomography, magnetic resonance imaging and ultrasound contributed greately to the specific imaging diagnosis. However plain chest X-ray is still most prequently used for imaging diagnosis of respiratory disease in clinical pratic and it is important to make a good quality of X-ray film and good interpretation. The optimal chest X-ray should be taken with full inspiration without rotation and motion and the exposure is at the level of barely demonstrable thoracic vertebral disc space. It is recommended that higk KVP technique for detection of lesions which is overlaped by mediastinum, heart and rib cage. It is better to examine chest X-ray film start at some distance(6-8 feet) and closer to the film later on and the reader should not read a film in fatigue condition. The reading room should be quiet and relately dark illumination. It is important, to make a good X-ray film and good interpretation to reduce the observer error.

• Journal of Veterinary Clinics
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• v.37 no.4
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• pp.204-207
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• 2020

A 12-year-old dog was evaluated for depression and anorexia. The results of complete blood count and serum biochemistry were normal. Survey radiographs revealed markedly enlarged right kidney and abdominal ultrasound showed a renomegaly and hydronephrosis filled with mixed echogenic fluid. Primary renal tumor was suspected in this dog. Nephroureterectomy of the right kidney was performed, and no regional metastases have been identified. Transitional cell carcinoma (TCC) arising from renal pelvis accompanied hydronephrosis of the right kidney was diagnosed on histology. TCC usually affects trigone of the bladder, and renal origin of TCC is a very rare finding in dogs. This is the first case report to present the clinical features, diagnostic imaging findings and histopathological characteristics of a dog with TCC originating from the renal pelvis in Korea.

• Clinical Pain
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• v.19 no.2
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• pp.97-100
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• 2020

An intraneural ganglion in the peripheral nerve and the resulting ulnar neuropathy at the elbow are uncommon and may show various symptoms ranging from local pain to motor and sensory impairment. We report a case of a 76-year-old man who was diagnosed with ulnar neuropathy caused by an intraneural ganglion derived from the elbow. We also discuss the pathophysiology, treatment, prognosis, and diagnostic value of ultrasonography in neuropathy caused by a ganglion.

• Clinical Pain
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• v.20 no.1
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• pp.20-24
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• 2021

In this case report, we present a rare case of lipoma of the tendon sheath localized to the wrist which caused median entrapment neuropathy and was successfully treated with surgical excision. Dynamic examination using ultrasonography revealed the exact location of the lipoma. Electrodiagnostic study (EDX) was done before surgery to elucidate combined neuropathy, and surgery for ulnar neuropathy around elbow was also performed simultaneously. Diagnostic ultrasound can be used for dynamic examinations with real-time visualization.

• Korean Journal of Veterinary Research
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• v.62 no.1
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• pp.2.1-2.5
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• 2022

An 8-year-old spayed female, mixed dog presented multiple, bloody exudative skin lesions on the bilateral flank which spread 1 week after mastectomy for treatment of mammary gland tumor (MGT). Multiple, ill-marginated, irregular, and heterogeneously thickened cutaneous and subcutaneous lesions and enlarged lymph nodes were identified in ultrasound and computed tomography. Histopathological examination confirmed adenocarcinoma with lymphatic invasion presumed to be metastatic MGT. Clinical signs improved after chemotherapy but died after 1 month. This study suggests that cutaneous metastasis be considered for differential diagnosis of cutaneous lesions in dogs with a history of MGT, although skin metastasis from MGT is rare.

• Journal of Digestive Cancer Research
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• v.3 no.1
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• pp.21-25
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• 2015

Gastric neuroendocrine tumors (GNETs, also known as gastric carcinoids) are rare form of hormone-secreting neoplasms that present with varied clinical syndromes. There are four types of GNETs based on size, proliferation, localization, differentiation, and hormone production. Type I GNET is related to autoimmune atrophic gastritis and hypergastrinemia. Type II GNETs are related to multiple endocrine neoplasia (MEN)-1, Zollinger-Ellison syndrome and hypergastrinemia. Type 3 GNETs are not associated with any background pathology, and type 4 GNETs are poorly differentiated tumors. The most useful diagnostic and prognostic marker for gastrointestinal NETs is plasma chromogranin A (CgA) levels. Endoscopic ultrasound is the method of choice to determine tumor size and depth of infiltration. For optimal management, the type, biology, and stage of the tumor must be considered. Here, we provide a comprehensive and up-to-date review of GNETs.

• Journal of Digestive Cancer Research
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• v.4 no.1
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• pp.10-16
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• 2016

There were no Korean evidence-based multidisciplinary guidelines for gastric cancer. Experts from related societies developed guidelines de novo to meet Korean circumstances and requirements, including 23 recommendation statements for diagnosis (n=9) and treatment (n=14) based on relevant key questions. The quality of the evidence was rated according to the GRADE evidence evaluation framework and the recommendation grades were classified as either strong or weak. The topics of the guidelines cover diagnostic modalities (endoscopy, endoscopic ultrasound, and radiologic diagnosis), treatment modalities (surgery, therapeutic endoscopy, chemotherapy, and radiotherapy), and pathologic evaluation. Major limitation of the present guideline is that there is no enough evidences in Korea. Therefore, clinical studies about gastric cancer for evidence generation should be conducted.

• Korean Journal of Radiology
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• v.25 no.6
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• pp.559-564
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• 2024

Incidental pancreatic cystic lesions are a common challenge encountered by diagnostic radiologists. Specifically, given the prevalence of benign pancreatic cystic lesions, determining when to recommend aggressive actions such as surgical resection or endoscopic ultrasound with sampling is difficult. In this article, we review the common types of cystic pancreatic lesions including serous cystadenoma, intraductal papillary mucinous neoplasm, and mucinous cystic neoplasm with imaging examples of each. We also discuss high-risk or worrisome imaging features that warrant a referral to a surgeon or endoscopist and provid several examples of these features. These imaging features adhere to the latest guidelines from the International Consensus Guidelines, American Gastroenterological Association (2015), American College of Gastroenterology (2018), American College of Radiology (2010, 2017), and European Guidelines (2013, 2018). Our focused article addresses the imaging dilemma of managing incidental cystic pancreatic lesions, weighing the options between imaging follow-up and aggressive interventions.