Developing a Magnetic Resonance-Compatible Catheter for Cardiac Catheterization

2012 ◽  
Vol 6 (4) ◽  
Author(s):  
Wei Yao ◽  
Tobias Schaeffter ◽  
Lakmal Seneviratne ◽  
Kaspar Althoefer
Keyword(s):  
Magnetic Resonance Imaging ◽  
Mechanical Properties ◽  
Experimental Study ◽  
Magnetic Resonance ◽  
Cardiac Catheterization ◽  
Mechanical Performance ◽  
Resonance Imaging ◽  
Radiation Hazards ◽  
Tissue Contrast ◽  
Magnetic Resonance Imaging Mri

Magnetic Resonance Imaging (MRI) is a means to guide cardiac interventions and provide excellent soft tissue contrast while avoiding radiation hazards. This paper investigates and evaluates a new Magnetic Resonance (MR)-compatible catheter for cardiac catheterization. Important mechanical properties of the catheter are measured and investigated; these include flexibility, pushability, and torquability. The mechanical performance of the MR-compatible and steerable catheter is benchmarked against three commercially-available clinical ablation catheters that are not MR-compatible. The MR-compatibility of the proposed catheter is also evaluated through an experimental study inside a 1.5 T MRI scanner. The new catheter is shown to have a mechanical performance comparable to that of existing catheters while being MR compatible.

scholarly journals Magnetic resonance imaging of salivary glands

2019 ◽  
Author(s):  
Danielle Ayumi Nishimura ◽  
Ana Luiza Esteves Carneiro ◽  
Kaisermann Costa ◽  
Wladimir Gushiken de Campos ◽  
Jefferson Xavier de Oliveira ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Salivary Glands ◽  
Imaging Techniques ◽  
Neck Region ◽  
Evaluation Instrument ◽  
Resonance Imaging ◽  
Tissue Contrast ◽  
Excellent Method ◽  
Magnetic Resonance Imaging Mri

Salivary glands tumors account for 2-5% of tumors in the head and neck region, possibly being benign or malignant. Magnetic resonance imaging (MRI) presents high soft tissue contrast resolution, thus being an excellent method for salivary gland analysis. The objective of this literature review is to analyze MRI as an evaluation instrument for the diagnosis of salivary glands lesions. Compared to other imaging techniques, MRI can better evaluate the relationship between adjacent anatomical structures, presenting greater sensitivity and specificity.

scholarly journals EXPERIMENTAL STUDY OF DOUBLE CABLE-CONDUIT DRIVING DEVICE FOR MRI COMPATIBLE BIOPSY ROBOTS

2021 ◽  
pp. 2140014
Author(s):  
XIAOHONG JIA ◽  
YONGDE ZHANG ◽  
HAIYAN DU ◽  
YAN YU
Keyword(s):  
Magnetic Resonance Imaging ◽  
Experimental Data ◽  
Experimental Study ◽  
Magnetic Resonance ◽  
Large Scale ◽  
Breast Biopsy ◽  
The Novel ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
Better Than

Magnetic resonance imaging (MRI) is better than other imaging equipment in detecting tumors, and navigation for robotic breast intervention biopsy. However, material requirements for robots driving devices are demanding incredibly because of the environment. Given this problem, a novel double cable-conduit driving method is put forward in this paper, which can be used in MRI for breast intervention robots. Besides, lebus grooves are adopted to the driving wheels, which enable the system to realize remote-range and large-scale driving on the premise that the precision can be further enhanced. The driving characteristic of the novel cable-conduit is established. Moreover, the cable-conduit experimental data proves the results of theoretical deduction. Finally, the cable-conduit driving device is compensated, the average errors in the [Formula: see text], [Formula: see text], and [Formula: see text] directions of the needle tip entering the tissue are less than 2[Formula: see text]mm. The consequence verifies that it can meet the requirements for breast biopsy robot application under MR environment.

Magnetic resonance imaging in gynecological practice

1997 ◽  
Vol 78 (6) ◽  
pp. 439-441
Author(s):  
A. T. Valiullina ◽  
L. M. Tukhvatullina ◽  
R. F. Bakhtiozin ◽  
I. R. Chuvashaev
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Soft Tissues ◽  
Dynamic Control ◽  
Anatomical Structure ◽  
Resonance Imaging ◽  
Noninvasive Diagnostics ◽  
Tissue Contrast ◽  
Magnetic Resonance Imaging Mri ◽  
Natural Tissue

Magnetic resonance imaging (MRI) has become one of the leading methods of noninvasive diagnostics in the last 10 years. Interest in this type of examination is due to its great potential possibilities: absence of radiation exposure, high natural tissue contrast, obtaining sections of any orientation, possibility of multiple examination and dynamic control, determining not only the anatomical structure of soft tissues, but also their chemical composition.

scholarly journals Nanoparticle-Based Paramagnetic Contrast Agents for Magnetic Resonance Imaging

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Juan Pellico ◽  
Connor M. Ellis ◽  
Jason J. Davis
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Contrast Agents ◽  
Imaging Modality ◽  
Relaxation Times ◽  
Deep Penetration ◽  
Resonance Imaging ◽  
Tissue Contrast ◽  
Recent Developments ◽  
Magnetic Resonance Imaging Mri

Magnetic resonance imaging (MRI) is a noninvasive medical imaging modality that is routinely used in clinics, providing anatomical information with micron resolution, soft tissue contrast, and deep penetration. Exogenous contrast agents increase image contrast by shortening longitudinal (T1) and transversal (T2) relaxation times. Most of the T1 agents used in clinical MRI are based on paramagnetic lanthanide complexes (largely Gd-based). In moving to translatable formats of reduced toxicity, greater chemical stability, longer circulation times, higher contrast, more controlled functionalisation and additional imaging modalities, considerable effort has been applied to the development of nanoparticles bearing paramagnetic ions. This review summarises the most relevant examples in the synthesis and biomedical applications of paramagnetic nanoparticles as contrast agents for MRI and multimodal imaging. It includes the most recent developments in the field of production of agents with high relaxivities, which are key for effective contrast enhancement, exemplified through clinically relevant examples.

Magnetic resonance imaging of the gallbladder: spectrum of abnormalities

2007 ◽  
Vol 48 (5) ◽  
pp. 476-482 ◽  
Author(s):  
K. M. Elsayes ◽  
E. P. Oliveira ◽  
V. R. Narra ◽  
F. M. EL-Merhi ◽  
J. J. Brown
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Clinical Symptoms ◽  
Malignant Tumors ◽  
Gallbladder Wall ◽  
Diagnostic Study ◽  
Resonance Imaging ◽  
Mr Cholangiopancreatography ◽  
Tissue Contrast ◽  
Magnetic Resonance Imaging Mri

Various pathologies involving the gallbladder can manifest clinically, producing nonspecific clinical symptoms and making diagnosis difficult and challenging. Real-time sonography is the most widely used diagnostic study for the gallbladder and the primary screening examination of choice. With increasing use of magnetic resonance imaging (MRI) and MR cholangiopancreatography (MRCP), gallbladder pathology is frequently seen. Understanding the basic patterns of various disease manifestations and appearance on MRI is the key to making an accurate diagnosis. Given its inherent tissue contrast and contrast sensitivity, MRI in conjunction with MRCP can be a very valuable test in evaluating gallbladder pathology. Gallbladder pathology can be classified into congenital (such as absence), inflammatory (acute, hemorrhagic, and chronic cholecystitis), traumatic, benign (polyps) and malignant tumors (gallbladder carcinoma and lymphoma), and other disease processes can be seen in cholelithiasis, cholesterosis, thickened gallbladder wall, and Mirrizzi syndrome.

What are the current and future requirements for magnetic resonance imaging interpretation skills in radiotherapy? A critical review

2016 ◽  
Vol 16 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Aston M. Midon ◽  
Pete Bridge ◽  
Mark Warren
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Critical Review ◽  
Resonance Imaging ◽  
Head And Neck Tumours ◽  
Image Guided Radiotherapy ◽  
Tissue Contrast ◽  
Magnetic Resonance Imaging Mri ◽  
Published Research

AbstractPurposeIncreasing usage of magnetic resonance imaging (MRI) in radiotherapy (RT) and the advent of MRI-based image-guided radiotherapy (IGRT) suggests a need for additional training within the RT profession. This critical review aimed to identify potential gaps in knowledge by evaluating the current skill base in MRI among therapeutic radiographers as evidenced by published research.MethodsPapers related to MRI usage were retrieved. Topic areas included outlining, planning and IGRT; diagnosis, follow-up and staging-related papers were excluded. After selection and further text analysis, papers were grouped by tumour site and year of publication.ResultsThe literature search and filtering resulted in a total of 123 papers, of which 66 were related to ‘outlining’, 37 to ‘planning’ and 20 to ‘IGRT’. The main sites of existing MRI expertise in RT were brain, central nervous system, prostate, and head and neck tumours. Expertise was clearly related to regions where MRI offered improved soft-tissue contrast. MRI studies within RT have been published from 2007 onwards at a steadily increasing rate.ConclusionCurrent use of MRI in RT is mainly restricted to sites where MRI offers a considerable imaging advantage over computed tomography. Given the changing use of MRI for image guidance, emerging therapeutic radiographers will require training in MRI interpretation across a wider range of anatomical regions.

scholarly journals Importance and Qualitative Requirements of Magnetic Resonance Imaging for Therapy Planning in Rectal Cancer – Interdisciplinary Recommendations of AIO, ARO, ACO and the German Radiological Society

2020 ◽  
Author(s):  
Ulrike Irmgard Attenberger ◽  
Stephan Clasen ◽  
Michael Ghadimi ◽  
Ulrich Grosse ◽  
Gerald Antoch ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Evaluation Method ◽  
Resonance Imaging ◽  
Radiological Society ◽  
Key Points ◽  
Contrast Magnetic Resonance ◽  
Tissue Contrast ◽  
Magnetic Resonance Imaging Mri ◽  
Therapeutic Decision Making

Due to its excellent intrinsic soft tissue contrast, magnetic resonance imaging allows excellent visualization and anatomical separation of therapy-relevant risk structures such as the mesorectal fascia, local lymph nodes, and vascular structures in patients with rectal carcinoma. This makes magnetic resonance imaging (MRI) a valuable evaluation method for further therapeutic stratification. In particular, MRI is indispensable for the decision to refrain from neoadjuvant therapy and to choose a primary surgical approach. In addition to the oncologically generally relevant T-, N-, and M-criteria, two further parameters are included: the extramural vascular infiltration and the circumferential resection margin. Due to the significant impact of MRI on further therapeutic decision-making, standardized MR image quality is considered essential. Key Points:  Citation Format

Magnetic Resonance Imaging Changes in a Patient with Migraine Attack and Transient Global Amnesia After Cardiac Catheterization

CNS Spectrums ◽  
2005 ◽  
Vol 10 (12) ◽  
pp. 980-983 ◽  
Author(s):  
Andres Fernandez ◽  
Fred Rincon ◽  
Sean P. Mazer ◽  
Mitchell S.V. Elkind
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Cardiac Catheterization ◽  
Transient Global Amnesia ◽  
Resonance Imaging ◽  
Ischemic Insult ◽  
Pertinent Literature ◽  
Global Amnesia ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Changes

AbstractThe presence of magnetic resonance imaging (MRI) abnormalities in patients with transient global amnesia has been an interesting phenomenologic finding. Several theories surround the occurrence of this syndrome, but little is known about its true physiopathology. We present a case of transient global amnesia after cardiac catheterization associated with migraine headache and MRI changes compatible with an ischemic insult. A discussion on potential explanations for this finding is made, as well as a review of the pertinent literature.

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