• The Journal of Korean Orthopaedic Ultrasound Society
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• v.4 no.1
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• pp.28-32
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• 2011

Snapping triceps syndrome is a rare disease in which medial head of triceps dislocates over the medial epicondyle during elbow flexion. It is difficult to diagnose the snapping triceps syndrome, because that this syndrome is frequently misdiagnosed as other elbow disease such as ulnarnerve dislocation. The dynamic ultrasonographic imaging allows continual visualization of the ulnar nerve and triceps muscle throughout active elbow flexion and extension. We report two patients of snapping triceps syndrome who were diagnosed with the use of dynamic ultrasonography and treated with ulnar nerve anterior transposition and repositioning or resectioning of medial head of triceps.

• Investigative Magnetic Resonance Imaging
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• v.17 no.3
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• pp.192-199
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• 2013

Purpose : To retrospectively evaluate the diagnostic performance of dynamic contrast-enhanced MR imaging (DCE-MRI) in detecting recurrent prostate cancer after HIFU of clinically localized cancer, as compared with T2-weighted imaging (T2WI). Materials and Methods: Twenty-six patients with increased prostate-specific antigen levels after HIFU were included in this study. All MR examinations were performed using T2WI and DCE-MRI, followed by transrectal ultrasound-guided biopsy. MRI and biopsy results were correlated in six prostate sectors. Residual or recurrent cancer after HIFU was defined as local tumor progression if biopsy results showed any cancer foci. Two independent readers interpreted the MR images. Results: Of 156 prostate sectors, 51 (33%) were positive for cancer in 17 patients. For detecting local tumor progression, the sensitivity of DCE-MRI and T2WI was 80% and 57% for reader 1 (P < 0.001) versus 84% and 61% for reader 2 (P < 0.001), respectively. The specificity and overall accuracy between DCE-MRI and T2WI showed no statistical difference in both readers (P > 0.05). Interobserver agreement of DCE-MRI and T2WI was moderate and fair, respectively. Conclusion: For detecting local tumor progression of prostate cancer after HIFU, DCE-MRI was more sensitive than T2WI, with less interobserver variability.

• The Journal of Korean Orthopaedic Ultrasound Society
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• v.8 no.1
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• pp.26-30
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• 2015

There are many traumatic foot and ankle problems in orthopaedic fields. Though it is not life-threatening problems, a delay in accurate diagnosis and treatments can danger limb function and therefore correct diagnosis can prevent long-term complications. Achilles tendon rupture is relatively common injury for active sports people. Ultrasonography is cost-effective, irradiation -free, effective for evaluation of soft tissues and dynamic analysis. It has been growing importance in Achilles tendon rupture. Ultrasonography is a diagnostic tool in Achilles tendon rupture. Physical examination and patient history is needed to diagnose Achilles tendon without image, but it is missed up by 20% in private clinic. Discontinuity of normal fibrillar architecture seen on an ultrasonographic image is diagnostic for Achilles tendon rupture, and can be accentuated by the performance of dorsi-flexion and plantar flexion, while observing in real time. And ultrasonography is a reliable method for serial observation after surgical treatment or conservative treatment.

• The Journal of Korean Orthopaedic Ultrasound Society
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• v.3 no.1
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• pp.38-46
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• 2010

The lesions around hip joint including bone, joint and soft tissue can cause the pain. For diagnosis of these lesions, physical examination and simple X-ray were accomplished primarily. Some special cases, CT or MRI was a useful tool. However ultrasonography could provide non-invasive and dynamic images for the lesions of tendon and bursa, and it could be a useful tool for follow up after hip surgery. Due to the deep location of hip joint, ultrasonography is not easy for physician to examine and its application was impossible in some obese patients. This article deals with the normal and pathologic ultrasonographic findings of the hip joint and various applications using ultrasonography.

• 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).

• The Journal of Korean Orthopaedic Ultrasound Society
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• v.1 no.2
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• pp.112-116
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• 2008

Ultrasonography of shoulder joint recently enlarges its utility since the knowledge of the shoulder disease is increased by numerous researches. Ultrasonography is not only noninvasive, safe, and relatively cheap, but also an unique modality that can monitor tendon movement during shoulder motion. Sonographic examination generally starts from the front side of the shoulder joint and finishes at back side in sitting position. Many structures in shoulder joint such as muscles, ligaments, glenoid labrum, bone, and especially rotator cuff tendon can be examined by ultrasonography. The rotator cuff is a motion unit consisted with subscapularis, supraspinatus, infraspinatus, and teres minor muscles. It functions as fulcrum and compresses the humeral head onto the glenoid, and steers for shoulder joint.

• Clinics in Shoulder and Elbow
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• v.12 no.2
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• pp.250-254
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• 2009

Purpose: Snapping triceps syndrome is dynamic condition in which medial head of triceps snaps (dislocates) over the medial epicondyle as the elbow is flexed. Materials and Methods: The symptoms are pain or snapping at the medial aspect of the elbow and/or symptoms from coexisting ulnar nerve irritation. The diagnosis can be made by dynamic ultrasonography. Results and Conclusion: And successful outcome can be archived by operative treatment, which are ulnar nerve anterior transposition and tenotomy of medial head of triceps.

• Journal of the Korean Society of Radiology
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• v.82 no.2
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• pp.280-297
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• 2021

International guidelines recommended screening with ultrasonography (US) every 6 months for patients at risk for hepatocellular carcinoma (HCC). However, US demonstrates low sensitivity for the early detection of HCC. Magnetic resonance imaging (MRI) plays an important role in the noninvasive diagnosis of HCC, but it is not suitable for surveillance due to its lengthy examination and high cost. Therefore, several studies have been using various abbreviated MRI strategies, including noncontrast abbreviated MRI, dynamic contrast-enhanced abbreviated MRI, and abbreviated MRI using hepatobiliary phase image for HCC surveillance. In this article, we aim to review these various strategies and explore the future direction of HCC surveillance considering the cost-effectiveness aspect.

• Journal of Yeungnam Medical Science
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• v.27 no.2
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• pp.105-112
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• 2010

Purpose : To evaluate the specific radiologic findings of testicular lymphoma which will be able to differentiated from other testicular tumors. Materials and Methods : Pathologically confirmed eight cases were included in this study. All eight cases were performed ultrasonography and four cases were performed magnetic resonance image. On ultrasonography, the size, location, shape, margin, internal echogenicity, homogeneity and vascularity were evaluated. On magnetic resonance image, the shape, margin, homogeneity, signal intensity on T1- and T2-weighted images, degree and homogeneity of the contrast enhancement and contrast enhancement change on dynamic enhancement study. Results : The margin of the mass was smooth on 6 of 8 patients. Internal echogenicity of the mass lesion was hypoechoic than normal testicular parenchyme on 7 of 8 patients. Four cases were homogeneous, 3 cases were relatively homogeneous and 1 case was heterogeneous. All 8 cases showed increased vascularity. The mass lesion was iso-signal intensity on T1-weighted image and low-signal intensity on T2-weighted image. All four cases were enhanced homogeneously and mildly than enhancing normal testicular parenchyme. On dynamic enhancement study, the mass lesion is progressively enhanced with time. Conclusion : The possibility of testicular lymphoma should be considered when testicular mass was homogeneously hypoechoic and low signal intensity on T2-weighted image in old age patients.

• Investigative Magnetic Resonance Imaging
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• v.17 no.2
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• pp.101-109
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• 2013

Objective: To investigate roles of dynamic contrast enhanced magnetic resonance (DCE MR) and diffusion-weighted (DW) imaging in preoperative prediction of underestimation of ductal carcinoma in situ (DCIS) ${\geq}2cm$ on US guided core needle biopsy. Materials and Methods: Twenty two patients with DCIS on US-guided 14 gauge core needle biopsy were included. Patients were divided into a group with and without DCIS underestimation based on histopathology. MR images including DCE and DW imaging were obtained with a 3.0-T MR. The lesion type (mass or non-mass), enhancement pattern, peak enhancement, and apparent diffusion coefficient (ADC) values of proven malignant masses were generated using software of CADstream and compared between two groups using Fisher's exact test and Mann Whitney test. Results: Eight patients were in the group with underestimation and 14 patients were in the group without underestimation. The lesion type and enhancement pattern were not different between two groups (P values = 1.000 and 0.613, respectively). The median peak enhancement of lesions with underestimation was 159.5%, higher than 133.5% of those without underestimation, but not significant (P value = 0.413). The median ADC value of lesions with underestimation was $1.26{\times}10^{-3}mm^2/sec$, substantially lower than $1.35{\times}10^{-3}mm^2/sec$ of those without underestimation (P value = 0.094). Conclusion: ADC values had the potential to preoperatively predict DCIS underestimation on US-guided core needle biopsy, although a large prospective series study should be conducted to confirm these results.