1,725,276 research outputs found
A Map with Open Borders, response by Elizabeth Barry and Margery Vibe Skagen
No full textIn the category “Review Response,” Age, Culture, Humanities features diverse, sometimes conflicting, views within age studies and assessments of the research carried out in the field. This article takes Elizabeth Barry’s and Margery Vibe Skagen’s 2020 anthology Literature and Ageing as a case in point to raise questions about some of the central tenets and approaches in the study of literature and aging. Most importantly, as the title suggests, the edited collection promises a clearer understanding of the relation between literature and ageing.
In the first section, Chris Gilleard offers his thoughts on the anthology and its essays. He raises a number of critical questions that, so we (in our capacity as co- editors of Age, Culture, Humanities) felt, address issues that are not only relevant to the anthology but are of larger importance to the field of age studies: What can literary studies – with its different methods and theories – add to the study of age and aging?
In order to enable a generative conversation about these questions, we invited the editors Barry and Skagen to write a response to Gilleard’s critique. It constitutes the second section of this article and, rather than defend their work, Barry and Skagen clarify what is, in their view, the role of literature in age studies
Advantages of radial volumetric breath-hold examination (VIBE) with k-space weighted image contrast reconstruction (KWIC) over Cartesian VIBE in liver imaging of volunteers simulating inadequate or no breath-holding ability
Full text linkTo investigate the superiority of radial volumetric breath-hold examination (r-VIBE) with k-space weighted image contrast reconstruction (KWIC) over Cartesian VIBE (c-VIBE) for reducing motion artefacts. We acquired r-VIBE-KWIC and c-VIBE images in 10 healthy volunteers. Each acquisition lasted 24 seconds. The volunteers held their breath for decreasing lengths of time during the acquisitions, from 24 to 0 seconds (protocols A-E). Magnetic resonance images at the level of the right portal vein and confluence of hepatic veins were assessed by two readers using a five-point scale with a higher number indicating a better study. The mean scores for the complete r-VIBE-KWIC series (r-VIBEfull) and first r-VIBE-KWIC series (r-VIBE1) were not significantly lower than those for c-VIBE in any protocols. The mean scores for c-VIBE were lower than those for r-VIBEfull and r-VIBE1 in protocols C and D. The mean score for c-VIBE was lower than that for r-VIBEfull in protocol E. The mean score for the eighth r-VIBE-KWIC series (r-VIBE8) was lower than that for c-VIBE only in protocol B. r-VIBE-KWIC minimised artefacts relative to c-VIBE at any slice location. The r-VIBE-KWIC's sub-frame images during the breath-holding period were hardly affected by another failed breath-holding period. aEuro cent A two-reader study revealed r-VIBE-KWIC's advantages over c-VIBE aEuro cent The image quality of r-VIBE-KWIC's sub-frame images was maintained during breath holding aEuro cent Full-frame r-VIBE-KWIC images minimized motion artefacts caused by breathing aEuro cent A complete breath holding over half the acquisition time is recommended for c-VIBE aEuro cent c-VIBE was susceptible to respiratory motion especially in the subphrenic region.ArticleEUROPEAN RADIOLOGY.26(8):2790-2797(2016)journal articl
Radial volumetric imaging breath-hold examination (VIBE) with k-space weighted image contrast (KWIC) for dynamic gadoxetic acid (Gd-EOB-DTPA)-enhanced MRI of the liver: advantages over Cartesian VIBE in the arterial phase
Full text linkTo compare radial volumetric imaging breath-hold examination with k-space weighted image contrast reconstruction (r-VIBE-KWIC) to Cartesian VIBE (c-VIBE) in arterial phase dynamic gadoxetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (DCE-MRI) of the liver. We reviewed 53 consecutive DCE-MRI studies performed on a 3-T unit using c-VIBE and 53 consecutive cases performed using r-VIBE-KWIC with full-frame image subset (r-VIBEfull) and sub-frame image subsets (r-VIBEsub; temporal resolution, 2.5-3 s). All arterial phase images were scored by two readers on: (1) contrast-enhancement ratio (CER) in the abdominal aorta; (2) scan timing; (3) artefacts; (4) visualisation of the common, right, and left hepatic arteries. Mean abdominal aortic CERs for c-VIBE, r-VIBEfull, and r-VIBEsub were 3.2, 4.3 and 6.5, respectively. There were significant differences between each group (P < 0.0001). The mean score for c-VIBE was significantly lower than that for r-VIBEfull and r-VIBEsub in all factors except for visualisation of the common hepatic artery (P < 0.05). The mean score of all factors except for scan timing for r-VIBEsub was not significantly different from that for r-VIBEfull. Radial VIBE-KWIC provides higher image quality than c-VIBE, and r-VIBEsub features high temporal resolution without image degradation in arterial phase DCE-MRI. aEuro cent Radial VIBE-KWIC minimised artefact and produced high-quality and high-temporal-resolution images. aEuro cent Maximum abdominal aortic enhancement was observed on sub-frame images of r-VIBE-KWIC. aEuro cent Using r-VIBE-KWIC, optimal arterial phase images were obtained in over 90 %. aEuro cent Using r-VIBE-KWIC, visualisation of the hepatic arteries was improved. aEuro cent A two-reader study revealed r-VIBE-KWIC's advantages over Cartesian VIBE.ArticleEUROPEAN RADIOLOGY. 24(6):1290-1299 (2014)journal articl
Vibe Trío, trío intrumental (Ucrania)
No full textConcierto interpretado por El Vibe Trío. Este grupo fue fundado en Kiev en 2000 por Andrei Pushkarev, quien sien do un pianista de formación clásica tuvo la idea de conformar' un trío de jazz en el cual el instrumento principal - el piano- fuese remplazado por un vibráfono apoyado por la batería y el contrabajo, o la guitarra bajo
Vibe Trío, trío de jazz (Ucrania)
No full textConcierto celebrado por El Vibe Trio. Este grupo fue fundado en Kiev en 2000 por Andrei Pushkarev, quien siendo un pianista de formación clásica, tuvo la idea de conformar un trío de Jazz en el que el instrumento principal -el piano- fuese remplazado por un vibráfono, apoyado por la batería y el contrabajo, o guitarra bajo. La formación clásica que todos los integrantes del Vibe Trio poseen, define una cierta tendencia en su repertorio, convirtiendo al Jazz obras de Beethoven, Tchaikovsky, Gtieg, Kachaturian, entre otros. Ha participado en numerosos festivales internacionales de Jazz y de música moderna
역동적 조영증강 자기공명영상에서 CAIPIRINHA-VIBE, Radial-VIBE, 통상적 VIBE 기법의 비교: 팬텀 연구
No full text목적: 역동적 조영증강 자기공명영상에 Radial-VIBE 기법과 CAIPIRINHA-VIBE 기법이 적용 가능함을 확인하기 위해 통상적 VIBE 기법과 Radial-VIBE 기법, CAIPIRINHA-VIBE 기법으로 촬영한 팬텀 영상을 비교한다.
연구방법: 다양한 농도의 NiCl2 용액이 담긴 시험관들로 구성된 팬텀을 통상적 VIBE 기법과 Radial-VIBE 기법, CAIPIRINHA-VIBE 기법으로 촬영한다. 팬텀 촬영은 육 분 동안의 역동적 영상과 variable flap angle 기법을 이용한 T1 지도 획득으로 이뤄진다. 신호 안정성과 신호 직선성은 역동적 영상에서, R1의 정확도는 T1 지도에서 평가한다. 또, 동일한 팬텀 촬영을 두 주와 세 달 간격으로 반복하며, within-subject coefficient of variation (WSCV)를 통해 반복성과 재현성을 평가한다.
연구결과: 육 분 동안의 신호 안정성은 세 기법 모두에서 안정적이었다. 신호 선형성은 CAIPIRINHA-VIBE 기법이 가장 높은 선형 상관관계를 보였고 (r=0.963), 통상적 VIBE 기법과 (r=0.959) Radial-VIBE 기법은 (r=0.953) 약간 낮은 선형 상관관계를 보였다. R1 정확도는 CAIPIRINHA-VIBE에서 가장 정확했고 (r=0.985), 통상적 VIBE 기법과 (r=0.861) Radial-VIBE 기법은 (r=0.442) 정확도가 낮았다. 또, CAIPIRINHA-VIBE 기법은 가장 좋은 반복성과 재현성을 보였고 (WSCV, 1.79-6.71%) Radial-VIBE 기법과 (WSCV, 2.04-67.2%) 통상적 VIBE 기법은 (WSCV, 3.4-31.9%) 이에 미치지 못했다.
결론: CAIPIRINHA-VIBE 기법은 팬텀촬영에서 평가한 역동적 조영증강 자기공명영상의 신호 안정성과 신호 직선성, R1 정확도와 영상의 반복성/재현성 측면에서 Radial-VIBE 기법과 통상적 VIBE 기법에 비해 우수하다.Docto
복부의 자유호흡 역동적 관류 MRI 프로토콜의 최적화: CAIPIRINHA-VIBE, Radial-VIBE, conventional VIBE 시퀀스의 비교
No full textObjectives: To evaluate the feasibility of CAIPIRINHA-VIBE for free-breathing DCE-MRI by comparison with Radial-VIBE with KWIC reconstruction (Radial-VIBE) and conventional-VIBE (c-VIBE) in both phantom and clinical studies.
Materials and Methods: Firstly, a phantom study to compare breathing effect of DCE-MRI images among three sequences was conducted. A moving platform was developed to simulate breathing motion and the DCE-MRI phantom was loaded on the platform. Dynamic scan was performed at 3.0T machine (Skyra, Siemens) using and CAIPIRINHA-VIBE, radial-VIBE, and c-VIBE for 6 minutes per sequence. We scanned the phantom at static and moving status, and additionally obtained motion-corrected images for moving status. And motion correction was performed for moving status images. The signal stability and signal-to-noise ratio (SNR) of each sequence were compared according to motion status. Coefficient of variation (CoV) was used to evaluate signal stability.
Secondly, a subsequent clinical study was performed. 23 prospectively enrolled patients underwent DCE-MRI of the abdomen using CAIPIRINHA-VIBE (n=10), Radial-VIBE (n=6), or c-VIBE (n=7). Qualitative image quality of the DCE-MRI images and perfusion maps was evaluated on a 5-point scale (1, poor, to 5, excellent quality). For quantitative analysis, the SNR of the liver and goodness-of-fit (GOF) of the time-intensity curve were measured.
Results: In the phantom study at moving status, CAIPIRINHA-VIBE showed the best image quality and the motion correction could align the CAIPIRINHA-VIBE images very well. CoV (%) of CAIPIRINHA-VIBE at moving status (18.65) was significantly decreased after motion correction (2.56) (P<0.001). In contrast, c-VIBE showed severe breathing motion artifacts which did not improve after motion correction. In radial-VIBE, the position of phantom did not move at moving status, but the streak artifact significantly degraded image quality. Regarding SNR, CAIPIRINHA-VIBE was the only sequence which showed improved SNR after motion correction (3.37) compared to moving status (9.41) (P<0.001).
In the clinical study using all three tested sequences, we obtained DCE-MRI with excellent temporal (5 s) and spatial resolution (1.48×1.48×4 mm/voxel). Regarding overall image quality of DCE-MRI images, CAIPIRINHA-VIBE (3.52±0.55) was comparable with Radial-VIBE (3.72±0.37; P=1.000), and both were significantly better than c-VIBE (2.71±0.34; P<0.001). The perfusion map quality score was highest for Radial-VIBE (4.33±0.65), followed by CAIPIRINHA-VIBE (3.70±0.73) and c-VIBE (3.14±0.66), but without statistical significance between CAIPIRINHA-VIBE and Radial-VIBE (P=0.167). The SNR of the liver and the GOF of the time-intensity curve did not significantly differ among three sequences (P=0.116 and P=0.224, respectively).
Conclusion: In the phantom study, CAIPIRINHA-VIBE could be the best sequence for free-breathing DCE-MRI with excellent image quality and maximum effect of motion correction. In the clinical study, CAIPIRINHA-VIBE and Radial-VIBE provide comparable better performance than c-VIBE. CAIPIRINHA-VIBE is a feasible and readily available sequence with acceptable good image quality for free-breathing DCE-MRI.
목적: 팬텀 실험 및 임상 연구에서 복부 자유호흡 관류 MRI 를 위한 CAIPIRINHA-VIBE 시퀀스를 Radial-VIBE with KWIC reconstruction (Radial-VIBE), conventional-VIBE (c-VIBE) 시퀀스와 비교하고자 한다.
재료 및 방법: 첫 번째로 팬텀 실험에서는 호흡 운동이 관류 MRI에 미치는 영향을 평가하였다. 호흡 운동을 시뮬레이션 하기 위해 moving platform을 제작하고, 팬텀 holder를 moving platform 위에 장착하였다. 3.0 T MR 기계 (Skyra, Siemens)를 이용하여 각각 CAIPIRINHA-VIBE, Radial-VIBE, c-VIBE 시퀀스를 이용한 역동적 스캔을 6분간 시행하였다. 팬텀 스캔은 정지 상태에서, 그리고 움직임 상태에서 각각 촬영하였고, 움직임 상태의 영상에 대해 움직임 보정을 시행한 영상을 추가적으로 얻었다. 각 시퀀스의 신호 안정성 및 신호 대 잡음 비는 운동 상태에 따라 비교하였다. Coefficient of variation (CoV)는 신호 안정성을 평가하기 위해 사용되었다.
두 번째, 임상 연구에서는 복부 관류 MRI를 시행하는 총 23명의 환자를 전향적으로 모집하였다. 이 중 10명은 CAIPIRINHA-VIBE, 6명은 Radial-VIBE, 7명은 c-VIBE를 시행하였다. 세 시퀀스 간의 비교는 정성적 그리고 정량적 평가로 진행되었다. 관류 MRI 영상 및 perfusion map의 정성적 평가는 5점 체계로 평가하였다 (1, 매우 나쁨-5, 매우 좋음). 정량적 평가를 위해서는 신호 대 잡음 비와 신호강도 곡선의 goodness-of-fit (GOF)를 평가하였다.
결과: 팬텀 실험에서는 움직임 상태에서 CAIPIRINHA-VIBE의 영상의 질이 가장 좋았고 움직임 보정의 효과가 가장 좋았다. CAIPIRINHA-VIBE의 CoV(%)는 움직임 상태에서 18.65 였으나 움직임 보정 후 2.56으로 의미 있게 감소하였다 (P<0.001). c-VIBE의 경우에는 움직임 영상에서 영상 왜곡과 잡음이 심하였고 이는 움직임 보정 후에도 거의 개선이 없었다. Radial-VIBE의 경우는 움직임 상태에서 팬텀이 거의 움직이지 않는 점은 우수하였으나 streak artifact가 영상의 질을 저하시켰고 이는 움직임 보정 후에도 개선되지 않았다. 신호 대 잡음 비의 경우 CAIPIRINHA-VIBE만이 움직임 보정 후에(3.37) 움직임 상태에(9.41) 비하여 신호 대 잡음 비의 향상을 보였다 (P<0.001).
임상 연구에서는 3가지 시퀀스를 이용한 관류 MRI 모두에서 뛰어난 시간 해상도 (5초) 및 공간 해상도 (1.48×1.48×4 mm/voxel)를 보였다. 전반적인 관류 MRI 이미지의 정성적 평가에 있어서는 CAIPIRINHA-VIBE가 (3.52±0.55) Radial-VIBE (3.72±0.37; P=1.000)와 비슷하였고 CAIPIRINHA-VIBE와 Radial-VIBE 모두 c-VIBE 보다는 유의하게 영상의 질이 우수하였다 (2.71±0.34; P<0.001). Perfusion map 의 정성적 평가에서는 Radial-VIBE (4.33±0.65)가 가장 우수하였고 그 다음이 CAIPIRINHA-VIBE (3.70±0.73), 그리고 c-VIBE (3.14±0.66)의 순이었다. 하지만CAIPIRINHA-VIBE와 Radial-VIBE 사이에 유의한 통계학적 차이는 보이지 않았다 (P=0.167). 간에서의 신호 대 잡음 비 (P=0.116) 및 신호강도 곡선의 GOF는(P=0.224) 세 시퀀스 간에 유의한 차이를 보이지 않았다.
결론: 팬텀 실험에서는 CAIPIRINHA-VIBE가 움직임 상태에서 영상의 질이 가장 우수하고 움직임 보정의 효과가 가장 커서 자유 호흡 DCE-MRI에서 가장 우수한 시퀀스가 될 수 있으리라 생각된다. 임상연구에서는 CAIPIRINHA-VIBE와 Radial-VIBE는 서로 비슷한 정도로 영상의 질이 우수하였으며 두 시퀀스 모두 c-VIBE 에 비해 우수한 결과를 보였다. Radial-VIBE가 research-based protocol인데 비해 CAIPIRINHA-VIBE는 현재 사용되고 있는 시퀀스로서 복부 자유호흡 관류 MRI 를 위한 적절한 시퀀스로 생각된다.Docto
FAT SIGNAL SUPPRESSION ASSESSMENT IN 3D GRADIENT ECHO VIBE SEQUENCE
No full textopenLa risonanza magnetica è una delle metodiche diagnostiche di maggior impiego a livello radiologico. Essa si basa sulle proprietà elettromagnetiche degli atomi di idrogeno, sia che essi siano legati a molecole d'acqua, proteine, lipidi o grassi. Proprio in relazione a quest'ultimo, la tesi vuole valutare l’efficacia delle metodiche per la saturazione del segnale relativo al grasso. Per fare ciò si è reso necessario l'impiego di un fantoccio e di un tomografo RM 1,5 Tesla Siemens Avanto Fit. La sequenza su cui si è basato lo studio è la sequenza VIBE (volumetric, Interpolated, breath hold) alla quale sono state applicate differenti tecniche di saturazione del grasso (Q fat sat, water excitation, Dixon, SPAIR) in concomitanza alla variazione di altri parametri quali shimming, imaging parallelo e posizionamento nel bore RM del fantoccio. Il tutto cercando di mantenere l'acquisizione e la sequenza impiegata il più fedele possibile rispetto a quella impiegata nella pratica clinica.The Magnetic Resonance (MR) is one of the most important imaging used to diagnose. The molecules of our body are made of Hydrogen Atoms (proton) bond to create water, protein, lipid, and fat. The protons have a specific electromagnetic field. The MR allow to create a strong magnetic that organize and detect all protons in our body. The aim of this thesis is to evaluate all the fat saturation techniques, to do that it was used a MR Siemens, Avanto FIT of 1,5 Tesla and a phantom. It was examining VIBE sequence (volumetric, interpolated, breath hold), to which were applied different fat saturations methods (Q fat sat, water, excitation, Dixon, SPAIR) and at the same time different parameters like shimming, parallel imaging and phantom position in MR bore were changed. Everything to keeping similar the acquisitions and sequences like the sequence used in clinical practice
Lápiz Labial (Vegan Vibe)
No full textNuestra empresa se dedicada a la producción de labiales 100% veganos, con un fuerte enfoque en la sostenibilidad y el bienestar de sus clientes. La compañía utiliza ingredientes naturales y libres de crueldad animal, promoviendo un estilo de vida ético y responsable. Además, se preocupa por el medio ambiente, utilizando empaques reciclables y reduciendo su huella de carbono en el proceso de fabricación. La misión de Vegan Vibe Labiales es ofrecer productos cosméticos de alta calidad, seguros para los usuarios y respetuosos con el planeta.PregradoAdministrador(a) de Empresa
Feasibility of free-breathing dynamic contrast-enhanced MRI of the abdomen: a comparison between CAIPIRINHA-VIBE, Radial-VIBE with KWIC reconstruction and conventional VIBE
Full text linkOBJECTIVE: To evaluate the feasibilities of controlled aliasing in parallel imaging results in higher acceleration with volumetric interpolated breath-hold examination (CAIPIRINHA-VIBE), radial acquisition of VIBE (Radial-VIBE) with k-space-weighted image contrast (KWIC) reconstruction (KWIC-Radial-VIBE) and conventional-VIBE (c-VIBE) for free-breathing dynamic contrast-enhanced (DCE)-MRI of the abdomen. METHODS: 23 prospectively enrolled patients underwent DCE-MRI of the abdomen with CAIPIRINHA-VIBE (n = 10), KWIC-Radial-VIBE (n = 6) or c-VIBE (n = 7). Qualitative image quality of the DCE-MR images and perfusion maps was independently scored by two abdominal radiologists using a 5-point scale (from 1, uninterpretable, to 5, very good). For quantitative analysis, the signal-to-noise ratio (SNR) of the liver and goodness-of-fit (GOF) of the time-intensity curve were measured. RESULTS: In the three tested sequences, DCE-MRI had good temporal (5 s) and spatial resolution (1.48 x 1.48 x 4 mm/voxel). Interobserver agreement in the qualitative analysis was good (k = 0.753: 95% confidence interval, 0.610-0.895). Therefore, the mean scores were used in the data analysis. Overall image quality was comparable between CAIPIRINHA-VIBE (3.52 +/- 0.55) and KWIC-Radial-VIBE (3.72 +/- 0.37: p = 1.000), and both were significantly better than c-VIBE (2.71 +/- 0.34: p < 0.001). Perfusion map quality score was highest with KWIC-Radial-VIBE (4.33 +/- 0.65), followed by CAIPIRINHA-VIBE (3.70 +/- 0.73) and c-VIBE (3.14 +/- 0.66), but without statistical significance between CAIPIRINHA-VIBE and KWIC-Radial-VIBE (p = 0.167). The SNR of the liver and GOF of the time-intensity curve did not significantly differ between the three sequences (p = 0.116 and 0.224, respectively). CONCLUSION: CAIPIRINHA-VIBE and KWIC-Radial-VIBE provide comparably better performance than c-VIBE. Both can be feasible sequences with acceptable good image quality for free-breathing DCE-MRI. ADVANCES IN KNOWLEDGE: CAIPIRINHA-VIBE and KWIC-Radial-VIBE provide comparably better quality of free-breathing DCE-MRIs than c-VIBE
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