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박아영,서보경 대한초음파의학회 2018 ULTRASONOGRAPHY Vol.37 No.2
Ultrasonographic Doppler techniques have improved greatly over the years, allowing more sophisticated evaluation of breast tumor vascularity. Superb microvascular imaging (SMI) and contrast-enhanced ultrasound (CEUS) with second-generation contrast agents are two representative up-to-date techniques. SMI is a sensitive Doppler technique that adopts an intelligent filter system to separate low-flow signals from artifacts. With the development of second-generation contrast agents, CEUS has also emerged as a useful Doppler technique for evaluating tumor microcirculation. Both techniques can improve the diagnostic performance of gray-scale ultrasonography by providing vascular information useful not only for the morphologic assessment of microvessels, but also for the quantitative analysis of perfusion. In this review, we explain the imaging principles and previous research underlying these two vascular techniques, and describe our clinical experiences.
Local Recurrence of Secondary Hemangiosarcoma Following Breast Radiation Therapy: A Case Report
박아영,손은주,김현기,우희정,김정아,육지현,정준 대한영상의학회 2010 대한영상의학회지 Vol.63 No.6
Secondary hemangiosarcomas are a rare malignancy that can develop in breast tissue that has undergone prior radiation therapy. Post-irradiation hemangiosarcomas (PIHs) have been frequently described in the literature, although, to the best of our knowledge, the imaging findings of locally recurred PIHs have not been previously reported. We present imaging findings of a case of a locally recurring secondary hemangiosarcoma in the context of prior breast conservation surgery and radiation.
박아영,김현기,정태섭,윤춘식,유영훈,조용은,문은수,김성준 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.5
Bone metastasis from a spinal cord astrocytoma has been reported only twice in the English medical literature. It is generally known that bone metastasis is found after the initial diagnosis with/without intervening surgery rather than being found at the time of the diagnosis of astrocytoma. The purpose of this article is to report for the first time a case of concurrent bone metastasis from a spinal cord astrocytoma at the time of diagnosing the spinal cord astrocytoma.
A Case of the Vibrant Soundbridge Stapes Coupler in Patients with Mixed Hearing Loss
박아영,전주현,문인석,최재영 대한청각학회 2014 Journal of Audiology & Otology Vol.18 No.2
The Vibrant Soundbridge (VSB) with stapes clip coupler placement at the stapes head has been used successfully to treat mixed hearing loss. Coupling between the floating mass transducer of the VSB and the stapes head is technically less demanding than incus vibroplasty and is more likely to generate a positive outcome without significantly changing residual hearing or resulting in medical or surgical complications. A 65-year-old man with bilateral mixed hearing loss and chronic otitis media underwent vibroplasty with a stapes clip coupler. Speech discrimination scores in both quiet and noise environments showed better functional gain with the VSB than with the use of a conventional hearing aid. The results of the present case show the feasibility of implanting a VSB with a stapes coupler in patients with mixed hearing loss due to chronic otitis media.
A Case Study of Teaching and Learning English via E-textbook
박아영,이정민 한국디지털콘텐츠학회 2015 한국디지털콘텐츠학회논문지 Vol.16 No.5
Recent technological advancements, along with an increase in mobile Internet access, have spurred on significant developments in the production of e-textbooks. This case study explored the affordances of an iPad e-textbook through teacher and student experiences in English lessons using observation and interviews. The results showed that English learners and teacher benefited from handy and quick web access and the all-in-one features of the e-textbook (dictionary, hyperlinks, and note-taking functions). However, information oversupply by the e-textbook confused students’ learning and both students and teacher pointed out technical difficulties in using the e-textbook. In order to implement English pedagogy with technologies such as iPad e-textbooks, teachers should be equipped with the relevant technical skills and content knowledge in order to assist them in becoming autonomous learners in the digital classroom.