scholarly journals Single shot echo planar imaging (ssEPI) vs single shot turbo spin echo (ssTSE) DWI of the orbit in patients with ocular melanoma

2020 ◽  
pp. 20200825
Author(s):  
Ekim Gumeler ◽  
Safak Parlak ◽  
Gozde Yazici ◽  
Erdem Karabulut ◽  
Hayyam Kiratli ◽  
...  
Keyword(s):  
Image Quality ◽  
Uveal Melanoma ◽  
Spin Echo ◽  
Geometric Distortion ◽  
Single Shot ◽  
Turbo Spin Echo ◽  
Turbo Spin ◽  
Echoplanar Imaging ◽  
Noise Ratio ◽  
Signal Intensities

Objectives: Diffusion weighted imaging (DWI) has become important for orbital imaging. However, the echoplanar imaging (EPI) DWI has inherent obstacles due to susceptibility to magnetic field inhomogeneities. We conducted a comparative study assessing the image quality of orbits in a patient cohort with uveal melanoma (UM). We hypothesized that single shot turbo spin echo (ssTSE) DWI would have better image quality in terms of less distortion and artifacts and yield better tissue evaluation compared to ssEPI-DWI. Methods: ssEPI-DWI and ssTSE-DWI of orbits were obtained from 50 patients with uveal melanoma who were prospectively enrolled in the study. Distortion ratio (DR), signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), diffusion signal properties, and apparent diffusion coefficient (ADC) values were collected and compared between ssEPI-DWI and ssTSE-DWI. Two reviewers evaluated and compared the geometric distortion, susceptibility and ghosting artifacts, resolution, demarcation of ocular mass, and overall quality. Results: A higher DR was found in ssEPI-DWI compared to ssTSE-DWI (p < 0.001). SNR and CNR were lower for the temporal lobe cortex (p ≤ 0.004), but higher for melanoma in ssEPI-DWI than ssTSE-DWI (p ≤ 0.037). Geometric distortion and artifacts were more common in ssEPI-DWI (p < 0.001). Resolution (p ≤ 0.013) and overall quality (p < 0.001) were better in ssTSE-DWI. Ocular masses were demarcated better on ssEPI-DWI (p ≤ 0.002). Significant negative correlations between T1 and T2 signal intensities (r = −0.369, p ≤ 0.008) and positive correlations between T2 and both DWI signal intensities (r = 0.686 and p < 0.001 for ssEPI-DWI, r = 0.747 and p < 0.001 for ssTSE-DWI) were revealed. Conclusion: With less geometric distortion and susceptibility artifacts, better resolution, and overall quality, ssTSE-DWI can serve as an alternative to ssEPI-DWI for orbital DWI. Advances in knowledge: ssTSE-DWI can be a better alternative of diffusion imaging of orbits with less susceptibility artifact and geometric distortion compared to ssEPI-DWI.

scholarly journals High-Resolution Simultaneous Multi-Slice Accelerated Turbo Spin-Echo Musculoskeletal Imaging: A Head-to-Head Comparison With Routine Turbo Spin-Echo Imaging

2021 ◽  
Vol 12 ◽  
Author(s):  
Feifei Gao ◽  
Zejun Wen ◽  
Shewei Dou ◽  
Xiaojing Kan ◽  
Shufang Wei ◽  
...  
Keyword(s):  
Image Quality ◽  
Knee Joint ◽  
Ankle Joint ◽  
Spin Echo ◽  
Motion Artifacts ◽  
Knee Joints ◽  
Turbo Spin Echo ◽  
Turbo Spin ◽  
Scanning Time ◽  
Noise Ratio

Background/Aim: The turbo spin-echo (TSE) sequence is widely used for musculoskeletal (MSK) imaging; however, its acquisition speed is limited and can be easily affected by motion artifacts. We aimed to evaluate whether the use of a simultaneous multi-slice TSE (SMS-TSE) sequence can accelerate MSK imaging while maintaining image quality when compared with the routine TSE sequence.Methods: We prospectively enrolled 71 patients [mean age, 37.43 ± 12.56 (range, 20–67) years], including 37 men and 34 women, to undergo TSE and SMS sequences. The total scanning times for the wrist, ankle and knee joint with routine sequence were 14.92, 13.97, and 13.48 min, respectively. For the SMS-TSE sequence, they were 7.52, 7.20, and 6.87 min. Quantitative parameters, including the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR), were measured. Three experienced MSK imaging radiologists qualitatively evaluated the image quality of bone texture, cartilage, tendons, ligament, meniscus, and artifact using a 5-point evaluation system, and the diagnostic performance of the SMS-TSE sequences was evaluated.Results: Compared with the routine TSE sequences, the scanning time was lower by 49.60, 48.46, and 49.04% using SMS-TSE sequences for the wrist, ankle, and knee joints, respectively. For the SNR comparison, the SMS-TSE sequences were significantly higher than the routine TSE sequence for wrist (except for Axial-T2WI-FS), ankle, and knee joint MR imaging (all p &lt; 0.05), but no statistical significance was obtained for the CNR measurement (all p &gt; 0.05, except for Sag-PDWI-FS in ankle joint). For the wrist joint, the diagnostic sensitivity, specificity, and accuracy were 88.24, 100, and 92%. For the ankle joint, they were 100, 75, and 93.33%. For the knee joint, they were 87.50, 85.71, and 87.10%.Conclusion: The use of the SMS-TSE sequence in the wrist, ankle, and knee joints can significantly reduce the scanning time and show similar image quality when compared with the routine TSE sequence.

Centrically reordered inversion recovery half-Fourier single-shot turbo spin-echo sequence: improvement of the image quality of oxygen-enhanced MRI

2004 ◽  
Vol 52 (2) ◽  
pp. 200-205 ◽  
Author(s):  
Yoshiharu Ohno ◽  
Hiroto Hatabu ◽  
Takanori Higashino ◽  
Hideaki Kawamitsu ◽  
Hirokazu Watanabe ◽  
...  
Keyword(s):  
Image Quality ◽  
Spin Echo ◽  
Inversion Recovery ◽  
Single Shot ◽  
Turbo Spin Echo ◽  
Turbo Spin ◽  
Enhanced Mri ◽  
Spin Echo Sequence

scholarly journals Image quality assessment of single-shot turbo spin echo diffusion-weighted imaging with parallel imaging technique: a phantom study

2016 ◽  
Vol 89 (1065) ◽  
pp. 20160512 ◽  
Author(s):  
Tsukasa Yoshida ◽  
Atsushi Urikura ◽  
Kensei Shirata ◽  
Yoshihiro Nakaya ◽  
Shingo Terashima ◽  
...  
Keyword(s):  
Image Quality ◽  
Quality Assessment ◽  
Diffusion Weighted Imaging ◽  
Parallel Imaging ◽  
Image Quality Assessment ◽  
Imaging Technique ◽  
Spin Echo ◽  
Single Shot ◽  
Turbo Spin Echo ◽  
Turbo Spin

scholarly journals The Effect Of Number Of Excitation (Nex) Variation And Blade Technique On T2 Image Quality TSE Sagital Knee MRI

2019 ◽  
Vol 21 (1) ◽  
pp. 32
Author(s):  
Fella Ustia Nirmala
Keyword(s):  
Image Quality ◽  
Spin Echo ◽  
Cruciate Ligament ◽  
Region Of Interest ◽  
Turbo Spin Echo ◽  
Good Image Quality ◽  
Turbo Spin ◽  
Knee Mri ◽  
Noise Ratio ◽  
Anterior Cruciate

ABSTRACT The research has been conducted entitled Influence of Variation Number of Excitation (NEX) and BLADE Technique on Image Quality T2 TSE Sagital Knee MRI. This research was conducted at Haji General Hospital Surabaya by using MRI 1.5 Tesla modalities. The usage of BLADE technique combined with the NEX 1 and NEX 2 variations performed on sagittal tissue of the knee and using a Turbo Spin Echo (TSE) sequence with T2 weighting. Data analysis was done quantitatively by using Region of Interest (ROI) method on MRI computer then analyzed Sinyal to Noise Ratio (SNR) and Contrast to Noise Ratio (CNR). From the research, good image quality result obtained by using BLADE technique on NEX 2 variation with SNR of tissues was 130,71 for Fluid, 5,54 for Meniscus, 12,88 for Anterior Cruciate Ligament (ACL) and 5,95 for Posterior Cruciate Ligament (PCL), whereas the CNR value of tissues was 125.16 for fluid-meniscus, 117.82 for ACL-fluid and 124.76 for fluid-PCL. Keywords : NEX , TSE, T2 weighting, MRI Knee.

scholarly journals Comparison between turbo spin-echo and echo planar diffusion-weighted imaging of the female pelvis with 3T MRI

2021 ◽  
Vol 10 (2) ◽  
pp. 205846012199473
Author(s):  
Takeshi Yoshizako ◽  
Rika Yoshida ◽  
Hiroya Asou ◽  
Megumi Nakamura ◽  
Hajime Kitagaki
Keyword(s):  
Image Quality ◽  
Diffusion Weighted Imaging ◽  
Spin Echo ◽  
Turbo Spin Echo ◽  
Female Pelvis ◽  
3T Mri ◽  
Turbo Spin ◽  
Diffusion Weighted ◽  
Adc Values ◽  
Echo Planar

Background Echo-planar imaging (EPI)-diffusion-weighted imaging (DWI) may take unclear image affected by susceptibility, geometric distortions and chemical shift artifacts. Purpose To compare the image quality and usefulness of EPI-DWI and turbo spin echo (TSE)-DWI in female patients who required imaging of the pelvis. Material and Methods All 57 patients were examined with a 3.0-T MR scanner. Both TSE- and EPI-DWI were performed with b values of 0 and 1000 s/mm2. We compared geometric distortion, the contrast ratio (CR) of the myometrium to the muscle and the apparent diffusion coefficient (ADC) values for the myometrium and lesion. Two radiologists scored the TSE- and EPI-DWI of each patient for qualitative evaluation. Results The mean percent distortion was significantly smaller with TSE- than EPI-DWI ( p = 0.00). The CR was significantly higher with TSE- than EPI-DWI ( p = 0.003). There was a significant difference in the ADC value for the uterus and lesions between the EPI- and TSE-DWI ( p < 0.05). Finally, the ADC values of cancer were significantly different from those for the uterus and benign with both the two sequences ( p < 0.05). The scores for ghosting artifacts were higher with TSE- than EPI-DWI ( p = 0.019). But there were no significant differences between TSE- and EPI-DWI with regard to image contrast and overall image quality. Conclusion TSE-DWI on the female pelvis by 3T MRI produces less distortion and higher CR than EPI-DWI, but there is no difference in contrast and image quality.

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.

Application of T1-weighted BLADE sequence to abdominal magnetic resonance imaging of young children: a comparison with turbo spin echo sequence

2020 ◽  
Vol 61 (10) ◽  
pp. 1406-1413
Author(s):  
Kyu Sung Choi ◽  
Young Hun Choi ◽  
Jung-Eun Cheon ◽  
Woo Sun Kim ◽  
In One Kim
Keyword(s):  
Image Quality ◽  
Spin Echo ◽  
Motion Artifact ◽  
Turbo Spin Echo ◽  
Resonance Imaging ◽  
Turbo Spin ◽  
Abdominal Magnetic Resonance Imaging ◽  
Vessel Sharpness ◽  
Corticomedullary Differentiation ◽  
Lesion Conspicuity

Background The image quality of abdominal magnetic resonance imaging (MRI) in children who cannot hold their breath has been severely impaired by motion artifacts. Purpose To evaluate the usefulness of T1-weighted (T1W) BLADE MRI for axial abdominal imaging in children who cannot hold their breath. Material and Methods Two different BLADE sequences, with and without an inversion recovery (IR-BLADE), were compared to conventional turbo-spin echo (TSE) with a high number of excitations in 18 consecutive patients who cannot hold their breath. Overall image quality, motion artifact, radial artifact, hepatic vessel sharpness, renal corticomedullary differentiation, and lesion conspicuity were retrospectively assessed by two radiologists, using 4- or 5-point scoring systems. Signal variations of each sequence were measured for a quantitative comparison. The acquisition times of the three sequences were compared. Results IR-BLADE and BLADE showed significantly improved overall image quality and reduced motion artifact compared with TSE. IR-BLADE showed significantly better hepatic vessel sharpness and corticomedullary differentiation compared to both BLADE and TSE. Radial artifacts were only observed on IR-BLADE and BLADE. In nine patients with lesions, there were no significant differences in lesion conspicuity among three sequences. Compared to TSE, both IR-BLADE and BLADE showed decreased signal variations in the liver and muscle, and an increased signal variation through air. The mean acquisition times for IR-BLADE, BLADE, and TSE were comparable. Conclusion Compared to the TSE sequence, T1W IR-BLADE for pediatric abdominal MRI resulted in improved image quality, tissue contrast with a diminished respiratory motion artifact, and a comparable acquisition time.

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