<ol>
	<li>Hor, K. N., Gottliebson, W. M., Carson, C., Wash, E., Cnota, J., Fleck, R., Wansapura, J., Klimeczek, P., Al-Khalidi, H. R., Chung, E. S., Benson, D. W., Mazur, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Magnetic+Resonance+Feature+Tracking:+Comparison+of+Feature+Tracking+Method+for+Strain+Calculation+with+Harmonic+Phase+Imaging+Analysis+.">Magnetic Resonance Feature Tracking: Comparison of Feature Tracking Method for Strain Calculation with Harmonic Phase Imaging Analysis .</a> JACC Cardiovasc Imaging. 3 (2), 152-154 (2010).</li><li>Maret, E., Todt, T., Brudin, L., Nylander, E., Swahn, E., Ohlsson, J. L., Engvall, J. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Functional+measurement+based+on+feature+tracking+of+cine+magnetic+resonance+images+identify+left+ventricular+segments+with+myocardial+scar.">Functional measurement based on feature tracking of cine magnetic resonance images identify left ventricular segments with myocardial scar.</a> Cardiovascular Ultrasound. 7, 53-53 (2009).</li><li>Singh, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Optic Flow Computation: A Unified Perspective. , (1992).</li><li>Barron, J. L., Fleet, D. J., Beauchemin, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Performance+of+optical+flow+techniques.">Performance of optical flow techniques.</a> International Journal of Computer Vision. 12, 43-77 (1994).</li><li>Bohs, L. N., Geiman, B. J., Anderson, M. E., Gebhart, S. C., Trahey, G. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Speckle+tracking+for+multi-dimensional+flow+estimation.">Speckle tracking for multi-dimensional flow estimation.</a> Ultrasonics. 38, 369-375 (2000).</li><li>Malpica, N., Santos, A., Zuluaga, M. A., Ledesma, M. J., P&#233;rez, E., Garcia-Fernandez, M. A., Desco, M., M, . <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tracking+of+Regions-of-Interest+in+myocardial+contrast+echocardiography.">Tracking of Regions-of-Interest in myocardial contrast echocardiography.</a> Ultrasound in Med. &#38; Biol. 30, 303-309 (2004).</li></ol>

רולף באומן הוא עובד של TomTec Imaging Systems GmbH, גרמניה

אנו מתארים שיטה חדשה &quot;התכונה מעקב&quot; כדי למדוד פרמטרים דפורמציה ועקירה ברקמת שריר הלב הנגזרות תמונות SSFP. שיטה זו היה תוקף לאחרונה נגד נבל בהערכה של מתח שיא ההיקפי העולמי אוכלוסייה גדולה של חולים עם ניוון שרירים מסוג דושן (1). מצאנו קורלציה מצוינת בין אלו שתי טכניקות. טכנולוגיית מעקב תכונה פשוטה יחסית השימוש לא צריך שום רצפים הדמיה נוספות כגון תחושת תיוג, או צפוף. בנוסף הערכה קלינית תוקף של השיא העולמי ECC, נתונים זן האזורי ניתן לגזור גם FT נראה טכניקה חזקים מסוגלים להעריך האורך רדיאלי זן LV, כמו גם חדרי האורך המתח הנכון. מחקרים נוספים צריך להיעשות על מנת לקבוע בדיוק את גבולות הטכניקה לגבי ברזולוציה של זמן ומרחב של התמונה. FT מאפשרת השוואה על פני שיטות אחרות, כגון אקו מאז העיקרון הבסיסי הוא זהה. מסקנה מעקב תכונה יש את הפוטנציאל להיות משולב בעבודה הקלינית שכן הוא מבטל את הצורך של ניתוח זמן רב הליך הרכישה נוספים. FT יכול לשמש לצורך הערכה של זנים החדר השמאלי והימני העולמי סגמנטלי, dyssynchrony החדר השמאלי. מחקרים קליניים נוספים נערכים על מנת להעריך השימושיות של FT בקרדיולוגיה קלינית.

A correction was made to <a href="https://www-jove-com.remotexs.ntu.edu.sg/video/2356">Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking</a>. An author's given name was updated.
The author's name was updated from:
Woodrow Benson
to:
D. Woodrow Benson

A correction was made to <a href="https://www-jove-com.remotexs.ntu.edu.sg/video/2356">Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking</a>. An author's given name was updated.

Erratum: Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking

<ul style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> דיוגנס ® מעקב תכונה תוכנה (TomTec מערכות הדמיה, פולדה, גרמניה) </li></ul>

magnetic resonance derived myocardial strain assessment using feature tracking

מטרה: שיטה מדויקת ומעשית כדי למדוד פרמטרים כמו זן ברקמת שריר הלב הוא בעל ערך קליני רב, שכן הוכח, כי הלחץ הוא סמן רגיש יותר מוקדם מאשר עבור תפקוד כויץ הפרמטר EF שימוש תכוף. טכנולוגיות נוכחי עבור CMR הם זמן רב וקשה ליישם בפרקטיקה הקלינית. מעקב תכונה היא טכנולוגיה אשר יכול להוביל automization יותר וחוסנם של ניתוח כמותי של תמונות רפואיות עם צריכת פחות זמן מאשר בשיטות דומות. שיטות: הזנה אוטומטית או ידנית בשלב אחד משמש אתחול שממנו המערכת מתחילה לעקוב אחרי עקירה של דפוסי בודדים המייצגים מבנים אנטומיים לאורך זמן. המומחיות של שיטה זו הוא כי התמונות לא צריך לטפל בכל דרך שהיא מראש כמו למשל תיוג תמונות CMR. תוצאות: השיטה מתאימה מאוד למעקב רקמות שרירים עם פירוט זה כמותי המאפשר של שריר הלב וגם את זרימת הדם. מסקנות: זו שיטה חדשה מציעה חיסכון בהליך חזקים הזמן לכמת רקמת שריר הלב בדם ועם פרמטרים, עקירה מהירות דפורמציה על רצפים קבועים של CMR הדמיה. לפיכך ניתן ליישם בפרקטיקה הקלינית.

Watch this Scientific Journal Video about Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking at JoVE.com

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking

שיטה מדויקת ומעשית כדי למדוד פרמטרים כמו זן ברקמת שריר הלב הוא בעל ערך קליני רב, שכן הוכח, כי הלחץ הוא סמן רגיש יותר מוקדם עבור תפקוד כויץ מאשר שימוש תכוף פרמטר EF.

תהודה מגנטית נגזר מסננים הערכה שריר הלב באמצעות מעקב אחר תכונות

Purpose: An accurate and practical method to measure parameters like strain in myocardial tissue is of great clinical value, since it has been shown, that ...

magnetic-resonance-derived-myocardial-strain-assessment-using-feature

Nanyang Technological University

Research

JoVE Journal

Medicine

14.2K Views.  Cincinnati Children Hospital Medical Center (CCHMC). שיטה מדויקת ומעשית כדי למדוד פרמטרים כמו זן ברקמת שריר הלב הוא בעל ערך קליני רב, שכן הוכח, כי הלחץ הוא סמן רגיש יותר מוקדם עבור תפקוד כויץ מאשר שימוש תכוף פרמטר EF.

Video: Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking

Magnetic Resonance Imaging Quantification of Pulmonary Perfusion using Calibrated Arterial Spin Labeling

This demonstrates a MR imaging method to measure the spatial distribution of pulmonary blood flow in healthy subjects 
during normoxia (inspired O2, fraction (FIO2) = 0.21) hypoxia (FIO2 = 0.125), and hyperoxia 
(FIO2 = 1.00). In addition, the physiological responses of the subject are monitored in the MR scan environment. MR images 
were obtained on a 1.5 T GE MRI scanner during a breath hold from a sagittal slice in the right lung at functional residual capacity. An arterial 
spin labeling sequence (ASL-FAIRER) was used to measure the spatial distribution of pulmonary blood flow 1,2 and a multi-echo fast 
gradient echo (mGRE) sequence 3 was used to quantify the regional proton (i.e. H2O) density, allowing the quantification 
of density-normalized perfusion for each voxel (milliliters blood per minute per gram lung tissue). 
With a pneumatic switching valve and facemask equipped with a 2-way non-rebreathing valve, different oxygen concentrations 
were introduced to the subject in the MR scanner through the inspired gas tubing. A metabolic cart collected expiratory gas via expiratory tubing. Mixed expiratory O2 and CO2 concentrations, oxygen consumption, carbon dioxide production, respiratory exchange ratio, 
respiratory frequency and tidal volume were measured. Heart rate and oxygen saturation were monitored using pulse-oximetry. 
Data obtained from a normal subject showed that, as expected, heart rate was higher in hypoxia (60 bpm) than during normoxia (51) or hyperoxia (50) and the arterial oxygen saturation (SpO2) was reduced during hypoxia to 86%. Mean ventilation was 8.31 L/min BTPS during hypoxia, 7.04 L/min during normoxia, and 6.64 L/min during hyperoxia. Tidal volume was 0.76 L during hypoxia, 0.69 L during normoxia, and 0.67 L during hyperoxia. 
Representative quantified ASL data showed that the mean density normalized perfusion was 8.86 ml/min/g during hypoxia, 8.26 ml/min/g during normoxia and 8.46 ml/min/g during hyperoxia, respectively. In this subject, the relative dispersion4, an index of global heterogeneity, was increased in hypoxia (1.07 during hypoxia, 0.85 during normoxia, and 0.87 during hyperoxia) while the fractal dimension (Ds), another index of heterogeneity reflecting vascular branching structure, was unchanged (1.24 during hypoxia, 1.26 during normoxia, and 1.26 during hyperoxia). 
Overview. This protocol will demonstrate the acquisition of data to measure the distribution of pulmonary perfusion noninvasively under conditions of normoxia, hypoxia, and hyperoxia using a magnetic resonance imaging technique known as arterial spin labeling (ASL). 
Rationale: Measurement of pulmonary blood flow and lung proton density using MR technique offers high spatial resolution images which can be quantified and the ability to perform repeated measurements under several different physiological conditions. In human studies, PET, SPECT, and CT are commonly used as the alternative techniques. However, these techniques involve exposure to ionizing radiation, and thus are not suitable for repeated measurements in human subjects.

A MR imaging method to study the distribution of pulmonary blood flow under a variety of physiological conditions, in this case exposure to three different inspired oxygen concentrations: hypoxia, normoxia, and hyperoxia, is described. This technique utilizes human pulmonary physiology research techniques in an MR scanning environment.

דימות תהודה מגנטית כימות זלוף ריאתי באמצעות מכויל תיוג ספין העורקים

This demonstrates a MR imaging method to measure the spatial distribution of pulmonary blood flow in healthy subjects 
during normoxia (inspired O2, ...

Ultrasonic Assessment of Myocardial Microstructure

Echocardiography is a widely accessible imaging modality that is commonly used to noninvasively characterize and quantify changes in cardiac structure and function. Ultrasonic assessments of cardiac tissue can include analyses of backscatter signal intensity within a given region of interest. Previously established techniques have relied predominantly on the integrated or mean value of backscatter signal intensities, which may be susceptible to variability from aliased data from low frame rates and time delays for algorithms based on cyclic variation. Herein, we describe an ultrasound-based imaging algorithm that extends from previous methods, can be applied to a single image frame&#160;and accounts for the full distribution of signal intensity values derived from a given myocardial sample. When applied to representative mouse and human imaging data, the algorithm distinguishes between subjects with and without exposure to chronic afterload resistance. The algorithm offers an enhanced surrogate measure of myocardial microstructure and can be performed using open-access image analysis software.

Echocardiography is commonly used to noninvasively characterize and quantify changes in cardiac structure and function. We describe an ultrasound-based imaging algorithm that offers an enhanced surrogate measure of myocardial microstructure and can be performed using open-access image analysis software.

הערכה אולטרה סאונד של מיקרו-מבנה שריר הלב

Echocardiography is a widely accessible imaging modality that is commonly used to noninvasively characterize and quantify changes in cardiac structure and ...

Myocardial Infarction and Functional Outcome Assessment in Pigs

Introduction of newly discovered cardiovascular therapeutics into first-in-man trials depends on a strictly regulated ethical and legal roadmap. One important prerequisite is a good understanding of all safety and efficacy aspects obtained in a large animal model that validly reflect the human scenario of myocardial infarction (MI). Pigs are widely used in this regard since their cardiac size, hemodynamics, and coronary anatomy are close to that of humans. Here, we present an effective protocol for using the porcine MI model using a closed-chest coronary balloon occlusion of the left anterior descending artery (LAD), followed by reperfusion. This approach is based on 90 min of myocardial ischemia, inducing large left ventricle infarction of the anterior, septal and inferoseptal walls. Furthermore, we present protocols for various measures of outcome that provide a wide range of information on the heart, such as cardiac systolic and diastolic function, hemodynamics, coronary flow velocity, microvascular resistance, and infarct size. This protocol can be easily tailored to meet study specific requirements for the validation of novel cardioregenerative biologics at different stages (i.e. directly after the acute ischemic insult, in the subacute setting or even in the chronic MI once scar formation has been completed). This model therefore provides a useful translational tool to study MI, subsequent adverse remodeling, and the potential of novel cardioregenerative agents.

This protocol describes the porcine myocardial infarction (MI) model using a 90 min closed-chest coronary balloon occlusion of the left anterior descending artery (LAD), followed by reperfusion. Furthermore, the protocol for several outcome parameters, such as cardiac function, hemodynamics, microvascular resistance, and infarct size, are also presented.

אוטם שריר לב והערכת תוצאה תפקודית בחזירים

Introduction of newly discovered cardiovascular therapeutics into first-in-man trials depends on a strictly regulated ethical and legal roadmap. One ...

Noninvasive Assessment of Cardiac Abnormalities in Experimental Autoimmune Myocarditis by Magnetic Resonance Microscopy Imaging in the Mouse

Myocarditis is an inflammation of the myocardium, but only ~10% of those affected show clinical manifestations of the disease. To study the immune events of myocardial injuries, various mouse models of myocarditis have been widely used. This study involved experimental autoimmune myocarditis (EAM) induced with cardiac myosin heavy chain (Myhc)-&#945; 334-352 in A/J mice; the affected animals develop lymphocytic myocarditis but with no apparent clinical signs. In this model, the utility of magnetic resonance microscopy (MRM) as a non-invasive modality to determine the cardiac structural and functional changes in animals immunized with Myhc-&#945; 334-352 is shown. EAM and healthy mice were imaged using a 9.4 T (400 MHz) 89 mm vertical core bore scanner equipped with a 4 cm millipede radio-frequency imaging probe and 100 G/cm triple axis gradients. Cardiac images were acquired from anesthetized animals using a gradient-echo-based cine pulse sequence, and the animals were monitored by respiration and pulse oximetry. The analysis revealed an increase in the thickness of the ventricular wall in EAM mice, with a corresponding decrease in the interior diameter of ventricles, when compared with healthy mice. The data suggest that morphological and functional changes in the inflamed hearts can be non-invasively monitored by MRM in live animals. In conclusion, MRM offers an advantage of assessing the progression and regression of myocardial injuries in diseases caused by infectious agents, as well as response to therapies.

This study demonstrates the successful establishment of magnetic resonance microscopy imaging as a non-invasive tool to assess the cardiac abnormalities in mice affected with autoimmune myocarditis. The data indicate that the technique can be used to monitor the disease-progression in live animals.

הערכה לא פולשנית של לב חריגות בניסויית אוטואימוניות דלקת שריר לב על ידי תהודה מגנטית מיקרוסקופית הדמיה בעכבר

Myocarditis is an inflammation of the myocardium, but only ~10% of those affected show clinical manifestations of the disease. To study the immune events ...

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

Breast cancer is the most common cause of cancer among women worldwide. Early detection of breast cancer has a critical role in improving the quality of life and survival of breast cancer patients. In this paper a new approach for the detection of breast cancer is described, based on tracking the mammary architectural elements using diffusion tensor imaging (DTI). 
The paper focuses on the scanning protocols and image processing algorithms and software that were designed to fit the diffusion properties of the mammary fibroglandular tissue and its changes during malignant transformation. The final output yields pixel by pixel vector maps that track the architecture of the entire mammary ductal glandular trees and parametric maps of the diffusion tensor coefficients and anisotropy indices. 
The efficiency of the method to detect breast cancer was tested by scanning women volunteers including 68 patients with breast cancer confirmed by histopathology findings. Regions with cancer cells exhibited a marked reduction in the diffusion coefficients and in the maximal anisotropy index as compared to the normal breast tissue, providing an intrinsic contrast for delineating the boundaries of malignant growth. Overall, the sensitivity of the DTI parameters to detect breast cancer was found to be high, particularly in dense breasts, and comparable to the current standard breast MRI method that requires injection of a contrast agent. Thus, this method offers a completely non-invasive, safe and sensitive tool for breast cancer detection.

We describe how to obtain parametric and vector maps of the diffusion tensor of the breast using magnetic resonance imaging. The protocol and final output following imaging processing are tailored for tracking breast architectural features and detecting breast malignancy.

סרטן שד מעקב מאפיינים אדריכליים החלב וזיהוי עם דימות מותחת דיפוזי תהודה מגנטית

Breast cancer is the most common cause of cancer among women worldwide. Early detection of breast cancer has a critical role in improving the quality of ...

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

Quantitative magnetic resonance imaging (qMRI) describes the development and use of MRI to quantify physical, chemical, and/or biological properties of living systems. Neuromuscular diseases often exhibit a temporally varying, spatially heterogeneous, and multi-faceted pathology. The goal of this protocol is to characterize this pathology using qMRI methods. The MRI acquisition protocol begins with localizer images (used to locate the position of the body and tissue of interest within the MRI system), quality control measurements of relevant magnetic field distributions, and structural imaging for general anatomical characterization. The qMRI portion of the protocol includes measurements of the longitudinal and transverse relaxation time constants (T1 and T2, respectively). Also acquired are diffusion-tensor MRI data, in which water diffusivity is measured and used to infer pathological processes such as edema. Quantitative magnetization transfer imaging is used to characterize the relative tissue content of macromolecular and free water protons. Lastly, fat-water MRI methods are used to characterize fibro-adipose tissue replacement of muscle. In addition to describing the data acquisition and analysis procedures, this paper also discusses the potential problems associated with these methods, the analysis and interpretation of the data, MRI safety, and strategies for artifact reduction and protocol optimization.

Neuromuscular diseases often exhibit a temporally varying, spatially heterogeneous, and multi-faceted pathology. The goal of this protocol is to characterize this pathology using non-invasive magnetic resonance imaging methods.

דימות תהודה מגנטית כמותי של מחלת שריר שלד

Quantitative magnetic resonance imaging (qMRI) describes the development and use of MRI to quantify physical, chemical, and/or biological properties of ...

Simultaneous PET/MRI Imaging During Mouse Cerebral Hypoxia-ischemia

Dynamic changes in tissue water diffusion and glucose metabolism occur during and after hypoxia in cerebral hypoxia-ischemia reflecting a bioenergetics disturbance in affected cells. Diffusion weighted magnetic resonance imaging (MRI) identifies regions that are damaged, potentially irreversibly, by hypoxia-ischemia. Alterations in glucose utilization in the affected tissue may be detectable by positron emission tomography (PET) imaging of 2-deoxy-2-(18F)fluoro-&#7429;-glucose ([18F]FDG) uptake. Due to the rapid and variable nature of injury in this animal model, acquisition of both modes of data must be performed simultaneously in order to meaningfully correlate PET and MRI data. In addition, inter-animal variability in the hypoxic-ischemic injury due to vascular differences limits the ability to analyze multi-modal data and observe changes to a group-wise approach if data is not acquired simultaneously in individual subjects. The method presented here allows one to acquire both diffusion-weighted MRI and [18F]FDG uptake data in the same animal before, during, and after the hypoxic challenge in order to interrogate immediate physiological changes.

The method presented here uses simultaneous positron emission tomography and magnetic resonance imaging. In the cerebral hypoxia-ischemia model, dynamic changes in diffusion and glucose metabolism occur during and after injury. The evolving and irreproducible damage in this model necessitates simultaneous acquisition if meaningful multi-modal imaging data are to be acquired.

ההדמיה PET / MRI בו זמנית בעכבר מוחין היפוקסיה-איסכמיה

Dynamic changes in tissue water diffusion and glucose metabolism occur during and after hypoxia in cerebral hypoxia-ischemia reflecting a bioenergetics ...

Transthoracic Speckle Tracking Echocardiography for the Quantitative Assessment of Left Ventricular Myocardial Deformation

The value of conventional echocardiography is limited by differences in inter-individual image interpretation and therefore largely dependent on the examiners&#39; expertise. Speckle tracking Echocardiography (STE) is a promising but technically challenging method that can be used to quantitatively assess regional and global systolic and diastolic myocardial performance. Myocardial strain and strain rate can be measured in all three dimensions&#160;&#8212; radial, circumferential, longitudinal &#8212; of myocardial deformation. Standard cross-sectional two-dimensional B-mode images are recorded and subsequently postprocessed by automated continuous frame-by-frame tracking and motion analysis of speckles within the myocardium. Images are recorded as digital loops and synchronized to a 3-lead EKG for timing purposes. Longitudinal deformation is assessed in the apical 4-, 3-, and 2-chamber views. Circumferential and radial deformation are measured in the parasternal short axis plane.
Optimal image quality and accurate tissue tracking are paramount for the correct determination of myocardial performance parameters. Utilizing transthoracic STE in a healthy volunteer, the present article is a detailed outline of the essential steps and potential pitfalls of quantitative echocardiographic myocardial deformation analysis.

Speckle tracking echocardiography is an emerging diagnostic imaging technique for the quantitative assessment of global and regional myocardial performance. Standard view echocardiographic motion images are recorded and deformation parameters are subsequently measured by automated continuous frame-by-frame tracking and motion analysis of speckles within the B-mode images of the myocardium.

Transthoracic רבב מעקב אקו עבור הערכה כמותית של השמאל חדרית שריר הלב דפורמציה

The value of conventional echocardiography is limited by differences in inter-individual image interpretation and therefore largely dependent on the ...

In Vivo Tracking of Edema Development and Microvascular Pathology in a Model of Experimental Cerebral Malaria Using Magnetic Resonance Imaging

Cerebral malaria is a sign of severe malarial disease and is often a harbinger of death. While aggressive management can be life-saving, the detection of cerebral malaria can be difficult. We present an experimental mouse model of cerebral malaria that shares multiple features of the human disease, including edema and microvascular pathology. Using magnetic resonance imaging (MRI), we can detect and track the blood-brain barrier disruption, edema development, and subsequent brain swelling. We describe multiple MRI techniques that can visualize these pertinent pathological changes. Thus, we show that MRI represents a valuable tool to visualize and track pathological changes, such as edema, brain swelling, and microvascular pathology, in vivo.

In Vivo Tracking of Edema Development and Microvascular Pathology in a Model of Experimental Cerebral Malaria Using Magnetic Resonance Imaging

We describe a mouse model of experimental cerebral malaria and show how inflammatory and microvascular pathology can be tracked in vivo using magnetic resonance imaging.

בשנת מעקב Vivo של בצקת פיתוח ופתולוגיה מיקרוסקולרית במודל של מלריה מוחית ניסיוני באמצעות תהודה מגנטית הדמיה

Cerebral malaria is a sign of severe malarial disease and is often a harbinger of death. While aggressive management can be life-saving, the detection of ...

Cardiac Magnetic Resonance Imaging at 7 Tesla

CMR at an ultra-high field (magnetic field strength B0&#160;&#8805; 7 Tesla) benefits from the signal-to-noise ratio (SNR) advantage inherent at higher magnetic field strengths and potentially provides improved signal contrast and spatial resolution. While promising results have been achieved, ultra-high field CMR is challenging due to energy deposition constraints and physical phenomena such as transmission field non-uniformities and magnetic field inhomogeneities. In addition, the magneto-hydrodynamic effect renders the synchronization of the data acquisition with the cardiac motion difficult. The challenges are currently addressed by explorations into novel magnetic resonance technology. If all impediments can be overcome, ultra-high field CMR may generate new opportunities for functional CMR, myocardial tissue characterization, microstructure imaging or metabolic imaging. Recognizing this potential, we show that multi-channel radio frequency (RF) coil technology tailored for CMR at 7 Tesla together with higher order B0 shimming and a backup signal for cardiac triggering facilitates high fidelity functional CMR. With the proposed setup, cardiac chamber quantification can be accomplished in examination times similar to those achieved at lower field strengths. To share this experience and to support the dissemination of this expertise, this work describes our setup and protocol tailored for functional CMR at 7 Tesla.

The sensitivity gain inherent to ultrahigh field magnetic resonance holds promise for high spatial resolution imaging of the heart. Here, we describe a protocol customized for functional cardiovascular magnetic resonance (CMR) at 7 Tesla using an advanced multi-channel radio-frequency coil, magnetic field shimming and a triggering concept.

דימות תהודה מגנטית לב בטסלה 7

CMR at an ultra-high field (magnetic field strength B0&#160;&#8805; 7 Tesla) benefits from the signal-to-noise ratio (SNR) advantage inherent at higher ...