scholarly journals Cardiac MR elastography using reduced-FOV, single-shot, spin-echo EPI

2017 ◽  
Vol 80 (1) ◽  
pp. 231-238 ◽  
Author(s):  
Yi Sui ◽  
Shivaram P. Arunachalam ◽  
Arvin Arani ◽  
Joshua D. Trzasko ◽  
Phillip M. Young ◽  
...  
Keyword(s):  
Spin Echo ◽  
Single Shot ◽  
Mr Elastography ◽  
Cardiac Mr

scholarly journals Cardiac MR elastography of the mouse: Initial results

2016 ◽  
Vol 76 (6) ◽  
pp. 1879-1886 ◽  
Author(s):  
Yifei Liu ◽  
Thomas J. Royston ◽  
Dieter Klatt ◽  
E. Douglas Lewandowski
Keyword(s):  
Mr Elastography ◽  
Cardiac Mr ◽  
Initial Results

MR Cholangiopancreatography of Bile and Pancreatic Duct Abnormalities with Emphasis on the Single-Shot Fast Spin-Echo Technique

Radiographics ◽  
2000 ◽  
Vol 20 (4) ◽  
pp. 939-957 ◽  
Author(s):  
Kenneth M. Vitellas ◽  
Mary T. Keogan ◽  
Charles E. Spritzer ◽  
Rendon C. Nelson
Keyword(s):  
Pancreatic Duct ◽  
Spin Echo ◽  
Fast Spin Echo ◽  
Single Shot ◽  
Mr Cholangiopancreatography ◽  
Spin Echo Technique ◽  
Fast Spin

scholarly journals Diffusion Weighted MR Imaging of Primary and Recurrent Middle Ear Cholesteatoma: An Assessment by Readers with Different Expertise

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
A. Elefante ◽  
M. Cavaliere ◽  
C. Russo ◽  
G. Caliendo ◽  
M. Marseglia ◽  
...  
Keyword(s):  
Diagnostic Accuracy ◽  
Middle Ear ◽  
Spin Echo ◽  
Interrater Agreement ◽  
Lower Probability ◽  
Kappa Statistics ◽  
Single Shot ◽  
Predictive Values ◽  
Diffusion Weighted ◽  
Middle Ear Cholesteatoma

Introduction and Purpose. Diffusion weighted imaging (DWI) has been proven to be valuable in the diagnosis of middle ear cholesteatoma. The aims of our study were to evaluate the advantage of multi-shot turbo spin echo (MSh TSE) DWI compared to single-shot echo-planar (SSh EPI) DWI for the diagnosis of cholesteatoma.Material and Methods. Thirty-two patients with clinical suspicion of unilateral cholesteatoma underwent preoperative MRI (1.5T) with SSh EPI and MSh TSE. Images were separately analyzed by 4 readers with different expertise to confirm the presence of cholesteatoma. Sensitivity, specificity, diagnostic accuracy, and positive (PPV) and negative predictive values (NPV) were assessed for each observer and interrater agreement was assessed using kappa statistics. Diagnosis was obtained at surgery.Results. Overall MSh TSE showed higher diagnostic accuracy and lower negative predictive value (NPV) compared to conventional SSh EPI. Interreader agreement between the observers revealed the superiority of MSh TSE compared to SSh EPI. Interrater agreement among all the four observers was higher by using MSh TSE compared to SSh EPI.Conclusion. Our findings suggest that MSh TSE DWI has higher sensitivity for detection of cholesteatoma and lower probability of misdiagnosis. MSh TSE DWI is useful in guiding less experienced observers to the diagnosis.

Most commonly used sequences and clinical protocols for brain and spine magnetic resonance imaging allowing better identification of pathological changes in dogs

2013 ◽  
Vol 16 (1) ◽  
pp. 157-163 ◽  
Author(s):  
Y. Zhalniarovich ◽  
Z. Adamiak ◽  
A. Pomianowski ◽  
M. Jaskólska
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Imaging Modality ◽  
Spin Echo ◽  
Inversion Recovery ◽  
Fast Spin Echo ◽  
Single Shot ◽  
Turbo Spin Echo ◽  
Resonance Imaging ◽  
Turbo Spin

Abstract Magnetic resonance imaging is the best imaging modality for the brain and spine. Quality of the received images depends on many technical factors. The most significant factors are: positioning the patient, proper coil selection, selection of appropriate sequences and image planes. The present contrast between different tissues provides an opportunity to diagnose various lesions. In many clinics magnetic resonance imaging has replaced myelography because of its noninvasive modality and because it provides excellent anatomic detail. There are many different combinations of sequences possible for spinal and brain MR imaging. Most frequently used are: T2-weighted fast spin echo (FSE), T1- and T2-weighted turbo spin echo, Fluid Attenuation Inversion Recovery (FLAIR), T1-weighted gradient echo (GE) and spin echo (SE), high-resolution three-dimensional (3D) sequences, fat-suppressing short tau inversion recovery (STIR) and half-Fourier acquisition single-shot turbo spin echo (HASTE). Magnetic resonance imaging reveals neurologic lesions which were previously hard to diagnose antemortem.

scholarly journals Magnetic Resonance Fingerprinting with Combined Gradient- and Spin-echo Echo-planar Imaging: Simultaneous Estimation of T1, T2 and T2* with integrated-B1 Correction

2019 ◽  
Author(s):  
Mahdi Khajehim ◽  
Thomas Christen ◽  
J. Jean Chen
Keyword(s):  
Magnetic Resonance ◽  
Spin Echo ◽  
Echo Planar Imaging ◽  
Simultaneous Estimation ◽  
Single Shot ◽  
Planar Imaging ◽  
Reconstruction Process ◽  
Data Segment ◽  
T1 And T2 ◽  
Echo Planar

AbstractPurposeTo introduce a novel magnetic-resonance fingerprinting (MRF) framework with single-shot echo-planar imaging (EPI) readout to simultaneously estimate tissue T2, T1 and T2*, and integrate B1 correction.MethodsSpin-echo EPI is combined with gradient-echo EPI to achieve T2 estimation as well as T1 and T2* quantification. In the dictionary matching step, the GE-EPI data segment provides estimates of tissue T1 and T2* with additional B1 information, which are then incorporated into the T2-matching step that uses the SE-EPI data segment. In this way, biases in T2 and T2* estimates do not affect each other.ResultsAn excellent correspondence was found between our T1, T2, and T2* estimates and results obtained from standard approaches in both phantom and human scans. In the phantom scan, a linear relationship with R2>0.96 was found for all parameter estimates. The maximum error in the T2 estimate was found to be below 6%. In the in-vivo scan, similar contrast was noted between MRF and standard approaches, and values found in a small region of interest (ROI) located in the grey matter (GM) were in line with previous measurements (T2MRF=88±7ms vs T2Ref=89±11ms, T1MRF=1153±154ms vs T1Ref=1122±52ms, T2*MRF=56±4ms vs T2*Ref=53±3ms).ConclusionAdding a spin echo data segment to EPI based MRF allows accurate and robust measurements of T2, T1 and T2* relaxation times. This MRF framework is easier to implement than spiral-based MRF. It doesn’t suffer from undersampling artifacts and seems to require a smaller dictionary size that can fasten the reconstruction process.

Improvement of MR cholangiopancreatography at .5 T: Three-dimensional half-averaged single-shot fast spin echo with multi-breath-hold technique

1998 ◽  
Vol 8 (2) ◽  
pp. 459-466 ◽  
Author(s):  
Tomoaki Ichikawa ◽  
Hiroki Haradome ◽  
Hideto Hanaoka ◽  
Yosimori Kassai ◽  
Toshiaki Nitatori ◽  
...  
Keyword(s):  
Spin Echo ◽  
Three Dimensional ◽  
Fast Spin Echo ◽  
Breath Hold ◽  
Single Shot ◽  
Mr Cholangiopancreatography ◽  
Fast Spin

Diffusion-weighted MRI of the cervical spinal cord using a single-shot fast spin-echo technique: findings in normal subjects and in myelomalacia

2003 ◽  
Vol 45 (2) ◽  
pp. 90-94 ◽  
Author(s):  
K. Tsuchiya ◽  
S. Katase ◽  
A. Fujikawa ◽  
J. Hachiya ◽  
H. Kanazawa ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Cervical Spinal Cord ◽  
Spin Echo ◽  
Normal Subjects ◽  
Fast Spin Echo ◽  
Single Shot ◽  
Diffusion Weighted Mri ◽  
Diffusion Weighted ◽  
Spin Echo Technique ◽  
Fast Spin
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