• Title/Summary/Keyword: MRI 영상

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Useful of Magnetic Resonance Imaging in the Diagnosis and Surgical Plan of Intraperineal Lipoma in a Dog (자기공명영상이 개의 회음부 지방종의 진단 및 수술방법에 유용한 1예)

  • 송영성;장화석;김성미;김혜진;김순신;최치봉;김휘율
    • Journal of Veterinary Clinics
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    • v.21 no.1
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    • pp.58-61
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    • 2004
  • A 5-year old female shih-tzu referred to the veterinary Teaching Hospital, College of Veterinary Medicine, Konkuk University. The patient was presented with a mass of ventral to pubic region and intraperineal region. CBC, chemistry, x-ray, fine needle aspiration, biopsy and MRI was performed. The dog was definitively diagnosed as lipoma based on cytologic and histopathologic examination. In order to remove the mass, an approach with two direction was made. First, intraperineal region was removed about 40%, and then ventral to pubic was removed the remainder. And inserted penrose drain for obliterate dead space to prevent the accumulation of serous discharge. The dog is clinically normal and being monitored for development of any abnormal signs for the time being. In this case, diagnostic MRI was very useful procedure. it revealed accurate location of a lipoma and useful manner for decision of surgical approach to remove.

Studies on Possibility of Emotional State's Measurement using functional Magnetic Resonance Imaging (뇌기능영상을 이용한 감성지수 측정 가능성에 관한 연구)

  • 정순철;민병찬;김철중;김상균
    • Proceedings of the Korean Society for Emotion and Sensibility Conference
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    • 1999.03a
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    • pp.231-236
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    • 1999
  • 외부의 자극에 따른 인간 감성 변화의 실체를 파악하고자 심리학, 생리학, 의공학 등의 분야에서 많은 연구가 이루어져 왔다. 본 논문은 fMRI의 기본 원리와 지금까지 저자들의 fMRI 연구 내용을 중심으로 감성 변화의 측정에 이용 또는 응용 가능성이 있는 실험 결과들에 대해서 서술하고자 한다. 먼저 자극강도에 따른 해당피질에서의 활성화 영역의 분석을 통해 외부 자극과 반응 영역간의 정량적인 측정이 가능하다는 것을 보였다. 둘째로 시간축 신호의 해석을 통해 감성 변화의 추이를 관찰할 수 있다는 것을 보였다. 마지막으로 간섭요인 (소음)이 뇌기능에 미치는 영향에 대한 분석을 통해 감성의 변화가 이의의 뇌기능 수행에 미치는 영향을 유추해 보았다.

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MRI findings of a huge cystadenocarcinoma of the palate (구개에 발생한 거대 낭샘암종의 MRI 소견)

  • Choi, Jin-Woo
    • Imaging Science in Dentistry
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    • v.40 no.4
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    • pp.191-196
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    • 2010
  • Cystadenocarcinoma of the salivary glands is a very rare, slow growing, and low-grade malignant neoplasm. It is characterized by predominantly cystic growth with or without the intraluminal papillary component. However, it lacks of any additional specific histopathologic features that characterize other types of salivary carcinomas showing cystic growth. Therefore, definite diagnosis of the cystadenocarcinoma is difficult and it is often misdiagnosed. It is conceptually the malignant counterpart of the benign cystadenoma. We present a cystadenocarcinoma on the palate of a 49-year-old man with special emphasis on magnetic resonance imaging.

Development of MRI gradient waveform generator using DSP (DSP를 이용한 자기공명영상의 경사자계 파형 발생기 개발)

  • Ko, K.H.;Kwon, E.S.;Song, Y.C.;Kim, H.J.;Yim, C.Y.;Ahn, C.B.
    • Proceedings of the KIEE Conference
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    • 1999.07g
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    • pp.3147-3149
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    • 1999
  • In this paper, we develop a TMS320C31- 60 DSP board to generate spiral gradient waveforms for Spiral imaging, one of the ultra fast MRI methods. In Spiral imaging, accurate gradient waveforms are very important to acquire high quality image. For this purpose, sampling rate for generating the gradient waveforms is set twice as high as the data sampling rate. With the developed DSP board accurate gradient waveforms are obtained. Ultra fast MR image with the developed DSP board is currently under development.

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Magnetic Resonance Imaging Grading Systems for Central Canal and Neural Foraminal Stenoses of the Lumbar and Cervical Spines With a Focus on the Lee Grading System

  • Jiwoon Seo;Joon Woo Lee
    • Korean Journal of Radiology
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    • v.24 no.3
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    • pp.224-234
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    • 2023
  • Magnetic resonance imaging (MRI) is a standard imaging modality for diagnosing spinal stenosis, which is a common degenerative disorder in the elderly population. Standardized interpretation of spinal MRI for diagnosing and grading the severity of spinal stenosis is necessary to ensure correct communication with clinicians and to conduct clinical research. In this review, we revisit the Lee grading system for central canal and neural foraminal stenosis of the cervical and lumbar spine, which are based on the pathophysiology and radiologic findings of spinal stenosis.

The Role of Imaging in Current Treatment Strategies for Pancreatic Adenocarcinoma

  • Hyungjin Rhee;Mi-Suk Park
    • Korean Journal of Radiology
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    • v.22 no.1
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    • pp.23-40
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    • 2021
  • In pancreatic cancer, imaging plays an essential role in surveillance, diagnosis, resectability evaluation, and treatment response evaluation. Pancreatic cancer surveillance in high-risk individuals has been attempted using endoscopic ultrasound (EUS) or magnetic resonance imaging (MRI). Imaging diagnosis and resectability evaluation are the most important factors influencing treatment decisions, where computed tomography (CT) is the preferred modality. EUS, MRI, and positron emission tomography play a complementary role to CT. Treatment response evaluation is of increasing clinical importance, especially in patients undergoing neoadjuvant therapy. This review aimed to comprehensively review the role of imaging in relation to the current treatment strategy for pancreatic cancer, including surveillance, diagnosis, evaluation of resectability and treatment response, and prediction of prognosis.

MR Imaging of Shaken Baby Syndrome Manifested as Chronic Subdural Hematoma

  • Yul Lee;Kwan Seop Lee;Dae Hyun Hwang;In Jae Lee;Hyun Beom Kim;Jae Young Lee
    • Korean Journal of Radiology
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    • v.2 no.3
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    • pp.171-174
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    • 2001
  • Shaken baby syndrome (SBS) is a form of child abuse that can cause significant head injuries, of which subdural hematoma (SDH) is the most common manifestation. We report the MRI findings of chronic SDH in three cases of SBS, involving two-, three- and eight-month-old babies. The SDH signal was mostly low on T1-weighted images and high on T2-weighted images, suggesting chronic SDH. In chronic SDH, a focal high signal on T1-weighted images was also noted, suggesting rebleeding. Contrast-enhanced MRI revealed diffuse dural enhancement.

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Improvement of Fourier Transform Arteriography by Use of Ramped RF Profile and Dual Projections (경사 윤곽의 고주파 펄스와 이중 투사법에 의한 Fourier 변환 동맥 혈관 촬영법의 성능 향상)

  • Jung, K. J.;Kim, I. Y.;Lee, M. W.;Yi, Y.
    • Investigative Magnetic Resonance Imaging
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    • v.6 no.1
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    • pp.41-46
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    • 2002
  • The Fourier transform arteriography (FTA) exploits the periodic variation of arterial flow velociety of arterial flow velocity in stnchronized with cardiac cycles. This technique is intrinsically unique compared to other modern techniques. This technique separates the arteries from the veins using the pulsatile arterial flow without using the presaturation RF pulses. Therefore, it has less RF deposition and is free from the dark band artifacts that can arise from retrograde flow and curved arteries. Furthermore, it is free from the artifacts induced by eddy currents. However, there are some drawbacks such as a single projection view and the saturation of arteries at the end of an imaging slab. These drawbacks are circumvented by applying recently developed techniques. The fast gradient switching capability of modern MRI systems enabled us to incorporate dual projection views into the conventional FTA sequence without increasing the repetition time. In addition, signals from the distal arteries were enhanced by use of a ramped RF pulse and therefore the distal arteries were less saturated. By use of the FTA sequence with dual projection views and the ramped RF pulse, we acquired the sagittal and coronal projection views of femoral arteriograms simultaneously with more enhanced signals of distal arteries than the conventional FTA.

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Cardiac Magnetic Resonance Imaging Using Multi-physiological Intelligent Trigger System (멀티 생체신호 동기 시스템을 이용한 심장자기공명영상)

  • Park, Jinho;Yoon, Jong-Hyun;Yang, Young-Joong;Ahn, Chang-Beom
    • Investigative Magnetic Resonance Imaging
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    • v.18 no.3
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    • pp.244-252
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    • 2014
  • Purpose : We proposed a multi-physiological signals based real-time intelligent triggering system(MITS) for Cardiac MRI. Induced noise of the system was analyzed. Materials and Methods: MITS makes cardiac MR imaging sequence synchronize to the cardiac motion using ECG, respiratory signal and second order derivative of $SPO_2$signal. Abnormal peaks due to arrhythmia or subject's motion are rejected using the average R-R intervals and R-peak values. Induced eddy currents by gradients switching in cardiac MR imaging are analyzed. The induced eddy currents were removed by hardware and software filters. Results: Cardiac MR images that synchronized to the cardiac and respiratory motion are acquired using MITS successfully without artifacts caused by induced eddy currents of gradient switching or subject's motion or arrhythmia. We showed that the second order derivative of the $SPO_2$ signal can be used as a complement to the ECG signals. Conclusion: The proposed system performs cardiac and respiratory gating with multi-physiological signals in real time. During the cardiac gating, induced noise caused by eddy currents is removed. False triggers due to subject's motion or arrhythmia are rejected. The cardiac MR imaging with free breathing is obtained using MITS.

MR Findings of Papillary Neoplasms of the Breast (유두 종양의 자기공명 영상소견)

  • Jo, Yeseul;Kim, Sung Hun;Kang, Bong Joo;Choi, Byung Gil
    • Investigative Magnetic Resonance Imaging
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    • v.18 no.1
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    • pp.43-51
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    • 2014
  • Purpose : To review MR imaging finding of papillary lesion identified as additional suspicious lesion on MR image in women with biopsy-proven breast cancer and to evaluate upgrading rates after subsequent surgical histopathological diagnosis. Materials and Methods: Among 1729 preoperative MR image of women with biopsy proven breast cancer, US-guided CNB-proven 22 papillary lesions from 21 patients, which showed additional suspicious contrast enhancement other than index cancer on MR image, were subjected to the study. Some of these lesions underwent surgery, thus the comparisons between the histopathologic results were able to be compared to the results of US-guided CNB. Also retrospective analysis was done for MR findings of these lesions by BI-RADS MRI lexicon. Results: On MR imaging, 8 mass lesions, 7 non-mass lesions, 7 focus lesions were detected. All of the focus lesion (100%, 7/7) was diagnosed as benign lesion and showed plateau and washout pattern in dynamic MR image. After excisional biopsy, one of 9 benign papilloma (11.1%), 3 of 3 papillary neoplasm with atypia component (100%), 3 of 5 papillary neoplasm (60%) were upgraded to malignancy such as ductal carcinoma in situ (DCIS), invasive ductal carcinoma (IDC), invasive lobular carcinoma (ILC). Conclusion: The MR images of papillary lesions diagnosed by US-guided CNB exhibit no significant differences between malignancy and benign lesion. Also 41.2% of the lesion (7/17) was upgraded after subsequent surgery. Thus all of the papillary lesions require excisional biopsy for definite diagnosis and the MR imaging, it's just not enough by itself.