• Title, Summary, Keyword: Magnetic resonance imaging(MRI)

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Review of Recent Advancement of Ultra High Field Magnetic Resonance Imaging: from Anatomy to Tractography

  • Cho, Zang-Hee
    • Investigative Magnetic Resonance Imaging
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    • v.20 no.3
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    • pp.141-151
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    • 2016
  • Purpose: Advances of magnetic resonance imaging (MRI), especially that of the Ultra-High Field (UHF) MRI will be reviewed. Materials and Methods: Diffusion MRI data was obtained from a healthy adult young male of age 30 using a 7.0T research MRI scanner (Magnetom, Siemens) with 40 mT/m maximum gradient field. The specific imaging parameters used for the data acquisition were a single shot DW echo planar imaging. Results: Three areas of the imaging experiments are focused on for the study, namely the anatomy, angiography, and tractography. Conclusion: It is envisioned that, in near future, there will be more 7.0T MRIs for brain research and explosive clinical application research will also be developed, for example in the area of connectomics in neuroscience and clinical neurology and neurosurgery.

Breast Magnetic Resonance Image (MRI) Guideline: Breast Imaging Study Group of Korean Society of Magnetic Resonance in Medicine Recommendations

  • Choi, Seon Hyeong;Kang, Bong Joo;Jung, Seung Eun
    • Investigative Magnetic Resonance Imaging
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    • v.22 no.4
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    • pp.205-208
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    • 2018
  • The purpose of this study is to establish an appropriate protocol for breast magnetic resonance imaging (MRI) in the discipline of image quality standards. The intention of the protocol is to increase effectiveness of medical image information exchange involved in construction, activation, and exchange of clinical information for healthcare.

Interference Issuses of Radio Frequency Identification Devices in Magnetic Resonance Imaging Systems and Computed Tomography Scan

  • Periyasamy, M.;Dhanasekaran, R.
    • Journal of Magnetics
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    • v.20 no.3
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    • pp.295-301
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    • 2015
  • We evaluated certain issues related to magnetic resonance imaging (MRI) coupled with the use of active 2.5 GHz radio frequency identification (RFID) tags for patient identification using low field (0.3 T) MRI and computed tomography (CT) scans. We also investigated the performance of the RFID reader located outside the MRI room by considering several factors. A total of ten active RFID tags were exposed to several MRI sequences and X-rays of CT scan. We found that only card type active RFID tags are suitable for patient identification purpose in MRI environment and both wristbands as well as card tags were suitable for the same in CT environment. Severe artifacts were found in the captured MRI and CT images when the area of the imaging was in proximity to the tags. No external factors affected the performance of active RFID reader stationed outside the MRI scan room.

Magnetic resonance imaging-transrectal ultrasound fusion image-guided prostate biopsy: Current status of the cancer detection and the prospects of tailor-made medicine of the prostate cancer

  • Shoji, Sunao
    • Investigative and Clinical Urology
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    • v.60 no.1
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    • pp.4-13
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    • 2019
  • Multi-parametric magnetic resonance imaging (mpMRI) has been increasingly used to diagnose clinically significant prostate cancer (csPCa) because of its growing availability and its ability to combine anatomical and functional data. Magnetic resonance imaging (MRI)-transrectal ultrasound (TRUS) fusion imaging provides MRI information with TRUS images for prostate biopsies. This technique combines the superior sensitivity of MRI for targeting suspicious lesions with the practicality and familiarity of TRUS. MRI-TRUS fusion image-guided prostate biopsy is performed with different types of image registration (rigid vs. elastic) and needle tracking methods (electromagnetic tracking vs. mechanical position encoders vs. image-based software tracking). A systematic review and meta-analysis showed that MRI-targeted biopsy detected csPCa at a significantly higher rate than did TRUS-guided biopsy, while it detected significantly fewer cases of insignificant PCas. In addition to the high accuracy of MRI-targeted biopsy for csPCa, localization of csPCa is accurate. The ability to choose the route of biopsy (transperineal vs. transrectal) is required, depending on the patients' risk and the location and size of suspicious lesions on mpMRI. Fusion image-guided prostate biopsy has the potential to allow precise management of prostate cancer, including active surveillance, radical treatment, and focal therapy.

Functional Magnetic Resonance Imaging with Arterial Spin Labeling: Techniques and Potential Clinical and Research Applications

  • Kim, Ju Ho;Choi, Dae Seob;Park, Sung Eun;Choi, Ho Cheol;Kim, Seong Hu
    • Investigative Magnetic Resonance Imaging
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    • v.21 no.2
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    • pp.91-96
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    • 2017
  • Purpose: To describe technical methods for functional magnetic resonance imaging (fMRI) study with arterial spin labeling (ASL) compared to blood oxygenation level-dependent (BOLD) technique and discuss the potential of ASL for research and clinical practice. Materials and Methods: Task-based (n = 1) and resting-state fMRI (rs-fMRI) (n = 20) were performed using ASL and BOLD techniques. Results of both techniques were compared. Results: For task-based fMRI with finger-tapping, the primary motor cortex of the contralateral frontal lobe and the ipsilateral cerebellum were activated by both BOLD and ASL fMRI. For rs-fMRI of sensorimotor network, functional connectivity showed similar results between BOLD and ASL. Conclusion: ASL technique has potential application in clinical and research fields because all brain perfusion imaging, CBF measurement, and rs-fMRI study can be performed in a single acquisition.

Magnetic Resonance Imaging in Thorax (흉부의 자기공명영상)

  • Choi, Byoung Wook
    • Tuberculosis and Respiratory Diseases
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    • v.56 no.6
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    • pp.571-584
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    • 2004
  • Magnetic Resonance Imaging (MRI) is one of the most advanced imaging techniques in clinical and research medicine. However, clinical application of MRI to the lung or thorax has been limited due to various drawbacks. Low signal intensity of the lung and cardiac and respiratory movements are the most serious problems with MRI in thorax. Nevertheless, MRI is superior to CT in some selected patients with thoracic diseases. The role of clinical MRI in thoracic disease has been widened with improvement of MR equipments and development of new pulse sequences. Otherwise, functional assessment of lung by MRI has been studied for the last decade. These include perfusion MRI with or without contrast enhancement and ventilation MRI with oxygen-enhancement or hyperpolarized noble gas, $^3He$ and $^{129}Xe$.

Utility of Magnetic Resonance Imaging in the Diagnosis of Lung Adenocarcinoma with Extensive Necrosis: a Case Report

  • Choi, Sang Lim;Cha, Min Jae;Choi, Hye Won;Park, Byung-Joon;Kim, Mi Kyung;Kim, Jae Yeol
    • Investigative Magnetic Resonance Imaging
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    • v.22 no.4
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    • pp.254-259
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    • 2018
  • Application of magnetic resonance imaging (MRI) for assessment of pulmonary disease has been limited, due to susceptibility to cardiac pulsation, respiratory motion, and inhomogeneity of the magnetic field of the lung. With technical advances of MRI and unmet clinical needs for more accurate diagnosis and assessment of the disease, however, the use of MRI for evaluation of the lung has broadened. Herein, we present a case of pneumonic-type lung adenocarcinoma in a patient with history of anaphylactic shock to iodinated contrast medium, in which MRI played a critical role for targeted lung biopsy and cancer staging. Through this paper, we would like to report potential value of MRI in assessment of lung cancer.

HIGH RESOLUTION IMAGING IN 37 MRI SYSTEM

  • Park, Jeong-Il;Choi, Kim-S.;Choe, Bo-Young;Suh, Tae-Suk;Lee, Hyoung-Koo;Shin, Kyung-Sub;Lee, Heung-Kyu
    • Proceedings of the Korean Society of Medical Physics Conference
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    • pp.423-424
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    • 1999
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Brain Mapping Using Neuroimaging

  • Tae, Woo-Suk;Kang, Shin-Hyuk;Ham, Byung-Joo;Kim, Byung-Jo;Pyun, Sung-Bom
    • Applied Microscopy
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    • v.46 no.4
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    • pp.179-183
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    • 2016
  • Mapping brain structural and functional connections through the whole brain is essential for understanding brain mechanisms and the physiological bases of brain diseases. Although region specific structural or functional deficits cause brain diseases, the changes of interregional connections could also be important factors of brain diseases. This review will introduce common neuroimaging modalities, including structural magnetic resonance imaging (MRI), functional MRI (fMRI), diffusion tensor imaging, and other recent neuroimaging analyses methods, such as voxel-based morphometry, cortical thickness analysis, local gyrification index, and shape analysis for structural imaging. Tract-Based Spatial Statistics, TRActs Constrained by UnderLying Anatomy for diffusion MRI, and independent component analysis for fMRI also will also be introduced.

Contrast-Enhanced Cine Magnetic Resonance Imaging in Myocardial Infarction

  • 최병욱;최규옥;김영진;정남식;최동훈
    • Proceedings of the KSMRM Conference
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    • pp.43-43
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    • 2003
  • Viable myocardium can be distinguished from the infarcted myocardium by contrast-enhanced magnetic resonance imaging (ceMRI). In this study, contrast-enhancement with cine magnetic resonance imaging (cecineMRI) was performed for direct correlation of transmural extent of hyperenhancement and that of contractility.

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