scholarly journals Variation of inversion delay for wrist joint MR imaging with SPAIR technique: which ID is optimal?

MEDISAINS ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 9
Author(s):  
Fani Susanto ◽  
Hernastiti Sedya Utami
Keyword(s):  
Statistical Data ◽  
Wrist Joint ◽  
Spin Echo ◽  
Fat Suppression ◽  
Visual Grading ◽  
Post Test ◽  
Suppression Technique ◽  
Optimal Setting ◽  
Magnetic Resonance Imaging Mri ◽  
Anatomical Information

Background: The current fat suppression technique in magnetic resonance imaging (MRI) significantly diagnoses abnormalities in musculoskeletal disorders. The spectral attenuated inversion recovery (SPAIR) fat suppression (FS) technique had an inversion delay (ID) parameter that allows choosing between full or partial FS. This was the first research related to the optimal setting of the ID time variation in the SPAIR technique on T2-weighted MRI wrist joint images.Objectives: This study aims to find out anatomical information with the most optimal ID value of the MRI wrist joint image T2 turbo spin-echo (TSE) FS SPAIR coronal slice sequence.Method: This study was a pre-experimental post-test only. Scanning MR wrist joint 16 volunteers took data with the qualitative analysis used three radiologists (visual grading) with statistical data analysis.Results: Image information of the MRI wrist joint T2 TSE FS SPAIR coronal slices sequence showed differences in the variation of ID (p<0.001), where the ID of 85 ms produced the most optimal image information.Conclusion: MRI image of the wrist joint of the T2 TSE FS SPAIR coronal slices sequence the most optimal with an ID variation of 85 ms compared to ID 70 ms and 100 ms.

COMPARISON OF VARIOUS MRI FAT SUPPRESSION TECHNIQUES ON A WATER-FAT PHANTOM AT 1.5 T

2017 ◽  
Vol 29 (02) ◽  
pp. 1750015
Author(s):  
Hui-Chun Wang ◽  
Po-Chou Chen ◽  
Chun-Hsiung Chou ◽  
Cherng-Gueih Shy ◽  
Jo-Chi Jao
Keyword(s):  
Spin Echo ◽  
Fat Suppression ◽  
Time Inversion ◽  
Oil In Water ◽  
Iterative Decomposition ◽  
The Difference ◽  
Soft Tissue Diseases ◽  
Magnetic Resonance Imaging Mri ◽  
Fat Suppression Techniques ◽  
Clinical Mri

Nowadays, magnetic resonance imaging (MRI) has been widely applied for diagnosis of soft-tissue diseases. Most clinical MRI protocols use fat suppression (FS) methods to suppress fat signal, reduce chemical shift artifacts, and increase conspicuity of lesions. To understand the advantages, disadvantages, and clinical applications of the most commonly used FS methods is an important issue. The aim of this study was to evaluate FS performance of six FS methods on a fat-water phantom at 1.5[Formula: see text]T. The six MRI methods included iterative decomposition of water and fat with echo asymmetry and least squares estimation (IDEAL), short inversion time inversion recovery (STIR), and four chemical presaturation (Chem Presat) methods. The phantom was composed of homogeneous oil-in-water emulsions with various fat contents ranging from 0 to 100% in increments of 10%. The difference between the suppressed fat fractions (FS fractions) and the true fat fractions of the phantom was used as an index of FS performance. The correlations and levels of agreement (LOAs) between the FS fractions determined using each FS method and the true fat fractions of the phantom were analyzed. From the phantom study, it was found that FSE T2 FS, STIR and IDEAL could achieve more accurate FS fractions than the other three methods. The FS fractions determined using FSE T2 FS, STIR and IDEAL were in a good agreement. On the contrary, T2-weighted spin echo Chem Presat had the most inaccurate quantification of FS fractions among these six FS methods. Both the ranks of signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs) of the phantom were IDEAL [Formula: see text] FSE T2 FS [Formula: see text] STIR. The FS performance of these six FS methods in clinical use needs further study.

Abstract TP35: Estimation of Red Blood Cells in the Thrombus Using MRI. A Phantom Study with Predetermined Thrombus Components

Stroke ◽  
2017 ◽  
Vol 48 (suppl_1) ◽  
Author(s):  
Ana Paula Narata ◽  
Isabelle Filipiak ◽  
Richard Bibi ◽  
Jean Philippe Cottier ◽  
Kevin Janot
Keyword(s):  
Red Blood Cells ◽  
Blood Cells ◽  
Spin Echo ◽  
In Vitro Study ◽  
Fibrin Clot ◽  
Fluid Attenuated Inversion Recovery ◽  
Magnetic Resonance Imaging Mri ◽  
C 50 ◽  
D 20

Background and Purpose: Better understanding about thrombus composition seems necessary, as treatment of acute ischemic stroke (AIS) is focus on clot chemical dissolution and mechanical extraction. We propose to evaluate whether magnetic resonance imaging (MRI) can differentiate white from red clots and estimate red blood cells percentage (RBC%) using clots with predetermined components and an index based on MRI signal intensity (SI). Material and Methods: 5 clots (A=100% fibrin, B=80% RBC, C=50% RBC, D=20% RBC, E=unknown) were fixed in gelatin-manganese solution and studied by: high-resolution 3D T1-weighted (T1MPR), T2-weighted turbo spin echo (T2TSE), T2-weighted gradient echo (T2GE), susceptibility weighted (SWI), fluid-attenuated inversion recovery (FLAIR) and diffusion weighted imaging (DWI) with apparent diffusion coefficient (ADC). SI index was calculated with clot SI and gelatin SI. Statistical analysis compared RBC-clots to fibrin-clot SI index and the correlation of RBC% and SI index in each MRI sequence. Results: Each red clot was different from clot A except clot D in FLAIR. Correlation between clots SI index and RBC concentration were found in T1MPR (r=-0.84), SWI (r=-0.79), T2GE (r=-0.72) and FLAIR (r=0.80). Linear regression resolution provided an indirect RBC estimation for clot E: 47.3 % in T1MPR, SWI 41.5%, T2GE 45.1% and FLAIR 50.9%. Histological analysis confirmed clot E composition. Conclusion: This in vitro study suggests that MRI can differentiate white from red clots except clots with low RBC% in FLAIR and also provide approximate RBC%.

scholarly journals Improved fat suppression using multipeak reconstruction for IDEAL chemical shift fat-water separation: Application with fast spin echo imaging

2009 ◽  
Vol 29 (2) ◽  
pp. 436-442 ◽  
Author(s):  
Richard Kijowski ◽  
Michael A. Woods ◽  
Kenneth S. Lee ◽  
Kuya Takimi ◽  
Huanzhou Yu ◽  
...  
Keyword(s):  
Chemical Shift ◽  
Spin Echo ◽  
Fat Suppression ◽  
Fast Spin Echo ◽  
Water Separation ◽  
Fast Spin

Reappraisal of left‐sided gallbladder and its accompanying anomalies: a report of two cases and literature review

2005 ◽  
Vol 46 (3) ◽  
pp. 233-236 ◽  
Author(s):  
T. ‐C. Wu ◽  
R. ‐C. Lee ◽  
J. ‐H. Chiang ◽  
C. ‐Y. Chang
Keyword(s):  
Magnetic Resonance Imaging ◽  
Portal Vein ◽  
Three Dimensional ◽  
Ligamentum Teres ◽  
Hepatobiliary Surgery ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
Anatomical Information ◽  
Preoperative Work Up ◽  
Work Up

We report two cases of coexistent left‐sided gallbladder and right‐sided ligamentum teres with portal vein anomalies documented by magnetic resonance imaging (MRI) and three‐dimensional (3D) computed tomography during arterial portography (CTAP). Reformatted 3D MR and CTAP images provide an informative illustration of the accompanying portal vein anomalies. This important anatomical information is useful in preoperative work‐up of hepatobiliary surgery.

scholarly journals Myocardial Tissue Characterization By T2 Mapping in Thalassemia Major

Blood ◽  
2020 ◽  
Vol 136 (Supplement 1) ◽  
pp. 27-28
Author(s):  
Alessia Pepe ◽  
Nicola Martini ◽  
Rita Borrello ◽  
Vincenzo Positano ◽  
Laura Pistoia ◽  
...  
Keyword(s):  
Tissue Characterization ◽  
Spin Echo ◽  
T2 Mapping ◽  
Relaxation Times ◽  
Thalassemia Major ◽  
Fast Spin Echo ◽  
Myocardial Inflammation ◽  
Healthy Population ◽  
Myocardial Iron ◽  
Magnetic Resonance Imaging Mri

Introduction.The presence of iron deposits results in a significant reduction in all magnetic resonance imaging (MRI) relaxation times (T1, T2 and T2*). In the clinical setting the T2* technique is the method of choice for cardiac iron quantification and it has revolutionized the management of patients with hemoglopinopathies. Purpose.To compare myocardial T2 against T2* in patients with thalassemia major (TM) for myocardial iron characterization. Methods.133 TM patients (79 females, 38.4±11.3 years) enrolled in the Extension Myocardial Iron Overload in Thalassemia (eMIOT) Network were considered. T2 and T2* images were acquired, respectively, with multi-echo fast-spin-echo and gradient-echo sequences. Global heart T2 and T2* values were obtained by averaging the values in all 16 myocardial segments. The normal T2 range was established as mean±2 standard deviations on data acquired on 80 healthy volunteers (males: 48-56 ms and females: 50-57 ms). The lower limit of normal for global heart T2*, established on the same healthy population, was 32 ms. Results.A significant correlation was detected between global heart T2 and T2* values (R=0.577; P&lt;0.0001) (Figure). Out of the 113 (84.9%) patients with a normal global heart T2* value, none had a decreased global heart T2 value, while 58 (51.3%) had an increased T2 value. Out of the 20 patents with a decreased global heart T2* value, only 10 (50%) had also a reduced T2 value. Conversely, 9 (45.0%) had a normal global heart T2 value and one (4.5) showed an increased T2 value. The 59 patients with increased global heart T2 value were significantly older than the remaining patients (40.8±10.5 vs 36.4±11.6 years; P=0.019) Conclusion.All patients with decreased T2 value had also a decreased T2* value and in half of the patients iron load was undetected by T2, suggesting that T2 mapping does not offer any advantage in terms of sensitivity for MIO assessment. However, more than half of TM patients had an increased T2 value, thus may be caused by the presence of myocardial inflammation and/or edema. So, T2 mapping could reveal subclinical myocardial involvement in TM patients. Figure Disclosures Pistoia: Chiesi Farmaceutici S.p.A.:Other: speakers' honoraria.Meloni:Chiesi Farmaceutici S.p.A.:Other: speakers' honoraria.

scholarly journals Analisis Informasi Citra MRI Genu Potongan Aksial antara Sekuen Short TAU Inversion Recovery (STIR) dan Sekuen T2-Spectral Attenuation Inversion Recovery (T2-SPAIR)

2016 ◽  
Vol 2 (1) ◽  
pp. 103-110
Author(s):  
Thuthit Dwi Astuti ◽  
Emi Murniati ◽  
Sri Mulyati
Keyword(s):  
Quantitative Research ◽  
Fat Suppression ◽  
Inversion Recovery ◽  
Image Information ◽  
Mri Examination ◽  
Time Scanning ◽  
Significant Difference ◽  
Suppression Technique ◽  
Spectral Attenuation ◽  
Short Tau Inversion Recovery

Backgrounds: Genu MRI examination, according to Moeller (2003) and Westbrook (2008), was done by one fat supression technique in every slice. Radiology Installation of PAU dr.S.Hardjolukito Yogyakarta Hospital used two types of fat suppression technique those are STIR and T2-SPAIR. This study aims to find out the image differences between STIR and T2-SPAIR and to determine the fat suppresion technique that produces better image information of axial genu MR imaging.Methods: This research was a quantitative research with an experimental approach. Subjects of this study was image of axial genu MRI examination between STIR and T2- SPAIR in Radiology Installation of PAU dr.S.Hardjolukito Yogyakarta Hospital. The axial genu MR imaging STIR and T2-SPAIR assessed by three radiology phisicians using questioner. Data were statistically analyzed using Wilcoxon Sign Test.Results: The results showed a significant difference in all categories of assessment criteria between STIR and T2-SPAIR. In this study, the T2-SPAIR fat suppression technique produced better image information than STIR, whereas T2-SPAIR fat suppress signals was stronger than STIR.Conclusion: T2-SPAIR fat suppress signal was stronger than STIR that showed better image information and shorter time scanning

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