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https://www.readbyqxmd.com/read/28923276/rapid-whole-brain-resting-state-fmri-at-3%C3%A2-t-efficiency-optimized-three-dimensional-epi-versus-repetition-time-matched-simultaneous-multi-slice-epi
#1
Rüdiger Stirnberg, Willem Huijbers, Daniel Brenner, Benedikt A Poser, Monique Breteler, Tony Stöcker
State-of-the-art simultaneous-multi-slice (SMS-)EPI and 3D-EPI share several properties that benefit functional MRI acquisition. Both sequences employ equivalent parallel imaging undersampling with controlled aliasing to achieve high temporal sampling rates. As a volumetric imaging sequence, 3D-EPI offers additional means of acceleration complementary to 2D-CAIPIRINHA sampling, such as fast water excitation and elliptical sampling. We performed an application-oriented comparison between a tailored, six-fold CAIPIRINHA-accelerated 3D-EPI protocol at 530 ms temporal and 2...
September 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28905414/high-spatio-temporal-resolution-in-functional-mri-with-3d-echo-planar-imaging-using-cylindrical-excitation-and-a-caipirinha-undersampling-pattern
#2
Wietske van der Zwaag, Olivier Reynaud, Mayur Narsude, Daniel Gallichan, José P Marques
PURPOSE: The combination of 3D echo planar imaging (3D-EPI) with a 2D-CAIPIRINHA undersampling scheme provides high flexibility in the optimization for spatial or temporal resolution. This flexibility can be increased further with the addition of a cylindrical excitation pulse, which exclusively excites the brain regions of interest. Here, 3D-EPI was combined with a 2D radiofrequency pulse to reduce the brain area from which signal is generated, and hence, allowing either reduction of the field of view or reduction of parallel imaging noise amplification...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28653363/quiet-echo-planar-imaging-for-functional-and-diffusion-mri
#3
Jana Hutter, Anthony N Price, Lucilio Cordero-Grande, Shaihan Malik, Giulio Ferrazzi, Andreia Gaspar, Emer J Hughes, Daan Christiaens, Laura McCabe, Torben Schneider, Mary A Rutherford, Joseph V Hajnal
PURPOSE: To develop a purpose-built quiet echo planar imaging capability for fetal functional and diffusion scans, for which acoustic considerations often compromise efficiency and resolution as well as angular/temporal coverage. METHODS: The gradient waveforms in multiband-accelerated single-shot echo planar imaging sequences have been redesigned to minimize spectral content. This includes a sinusoidal read-out with a single fundamental frequency, a constant phase encoding gradient, overlapping smoothed CAIPIRINHA blips, and a novel strategy to merge the crushers in diffusion MRI...
June 26, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28577335/application-of-whole-lesion-histogram-analysis-of-pharmacokinetic-parameters-in-dynamic-contrast-enhanced-mri-of-breast-lesions-with-the-caipirinha-dixon-twist-vibe-technique
#4
Zhiwei Li, Tao Ai, Yiqi Hu, Xu Yan, Marcel Dominik Nickel, Xiao Xu, Liming Xia
PURPOSE: To investigate the application of whole-lesion histogram analysis of pharmacokinetic parameters for differentiating malignant from benign breast lesions on dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). MATERIALS AND METHODS: In all, 92 women with 97 breast lesions (26 benign and 71 malignant lesions) were enrolled in this study. Patients underwent dynamic breast MRI at 3T using a prototypical CAIPIRINHA-Dixon-TWIST-VIBE (CDT-VIBE) sequence and a subsequent surgery or biopsy...
June 3, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28486977/rapid-cartesian-versus-radial-acquisition-comparison-of-two-sequences-for-hepatobiliary-phase-mri-at-3-tesla-in-patients-with-impaired-breath-hold-capabilities
#5
Johannes Budjan, Philipp Riffel, Melissa M Ong, Stefan O Schoenberg, Ulrike I Attenberger, Daniel Hausmann
BACKGROUND: Hepatocyte-specific gadolinium based contrast agents (HSCA) provide substantial information for the classification of liver lesions in magnetic resonance imaging (MRI). However, breathing artifacts which reduce image quality and diagnostic confidence of hepatobiliary phase acquisitions are regularly observed in clinical routine. The aim of this study was to evaluate two approaches to reduce breathing artifacts for hepatobiliary phase imaging. METHODS: Twenty minutes after administration of a HSCA (gadoxetic acid), a T1-weighted VIBE sequence with radial k-space sampling (radialVIBE, 180 s acquisition time in free breathing) and a highly accelerated Cartesian VIBE with Dixon fat separation (CD-VIBE, CAIPIRINHA acceleration with r = 2 × 2, breath-hold 8-10 s) were acquired in 35 patients (12 female, 57 ± 13 years), who showed breath-holding difficulties in early phases of the examinations...
May 9, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28441159/application-of-high-speed-t1-sequences-for-high-quality-hepatic-arterial-phase-magnetic-resonance-imaging-intraindividual-comparison-of-single-and-multiple-arterial-phases
#6
Yang Shin Park, Chang Hee Lee, Jeong Woo Kim, Young-Sun Lee, MunYoung Paek, Kyeong Ah Kim
PURPOSE: The aim of this study was to compare intraindividual single and multiple arterial phase acquisitions and evaluate which acquisition method was more advantageous for obtaining high-quality hepatic arterial phase in gadoxetic acid-enhanced liver magnetic resonance imaging (MRI). MATERIALS AND METHODS: Sixty-seven patients who underwent gadoxetic acid-enhanced liver MRIs and had all 3 kinds of acquisitions (single, dual, and triple arterial phases) were retrospectively included...
April 24, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28246509/the-effects-of-breathing-motion-on-dce-mri-images-phantom-studies-simulating-respiratory-motion-to-compare-caipirinha-vibe-radial-vibe-and-conventional-vibe
#7
COMPARATIVE STUDY
Chang Kyung Lee, Nieun Seo, Bohyun Kim, Jimi Huh, Jeong Kon Kim, Seung Soo Lee, In Seong Kim, Dominik Nickel, Kyung Won Kim
OBJECTIVE: To compare the breathing effects on dynamic contrast-enhanced (DCE)-MRI between controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA)-volumetric interpolated breath-hold examination (VIBE), radial VIBE with k-space-weighted image contrast view-sharing (radial-VIBE), and conventional VIBE (c-VIBE) sequences using a dedicated phantom experiment. MATERIALS AND METHODS: We developed a moving platform to simulate breathing motion...
March 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28220617/wave-caipi-for-highly-accelerated-mp-rage-imaging
#8
Daniel Polak, Kawin Setsompop, Stephen F Cauley, Borjan A Gagoski, Himanshu Bhat, Florian Maier, Peter Bachert, Lawrence L Wald, Berkin Bilgic
PURPOSE: To introduce a highly accelerated T1-weighted magnetization-prepared rapid gradient echo (MP-RAGE) acquisition that uses wave-controlled aliasing in parallel imaging (wave-CAIPI) encoding to retain high image quality. METHODS: Significant acceleration of the MP-RAGE sequence is demonstrated using the wave-CAIPI technique. Here, sinusoidal waveforms are used to spread aliasing in all three directions to improve the g-factor. Combined with a rapid (2 s) coil sensitivity acquisition and data-driven trajectory calibration, we propose an online integrated acquisition-reconstruction pipeline for highly efficient MP-RAGE imaging...
February 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28198576/a-constrained-slice-dependent-background-suppression-scheme-for-simultaneous-multislice-pseudo-continuous-arterial-spin-labeling
#9
Xingfeng Shao, Yi Wang, Steen Moeller, Danny J J Wang
PURPOSE: To present a constrained slice-dependent (CSD) background-suppression (BS) scheme in 2D arterial spin labeling (ASL) using simultaneous multislice acquisition with blipped-CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration). METHODS: Background suppression for 2D acquisition is challenging because of the multiple nulling points required for sequential slice readout. Constrained slice-dependent BS exploits the simultaneous multislice technique to reduce the readout duration, and uses slice-dependent premodulation pulses to achieve BS across slice groups...
February 15, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28116515/caipirinha-accelerated-space-enables-10-min-isotropic-3d-tse-mri-of-the-ankle-for-optimized-visualization-of-curved-and-oblique-ligaments-and-tendons
#10
Vivek Kalia, Benjamin Fritz, Rory Johnson, Wesley D Gilson, Esther Raithel, Jan Fritz
OBJECTIVES: To test the hypothesis that a fourfold CAIPIRINHA accelerated, 10-min, high-resolution, isotropic 3D TSE MRI prototype protocol of the ankle derives equal or better quality than a 20-min 2D TSE standard protocol. METHODS: Following internal review board approval and informed consent, 3-Tesla MRI of the ankle was obtained in 24 asymptomatic subjects including 10-min 3D CAIPIRINHA SPACE TSE prototype and 20-min 2D TSE standard protocols. Outcome variables included image quality and visibility of anatomical structures using 5-point Likert scales...
September 2017: European Radiology
https://www.readbyqxmd.com/read/28027748/intra-individual-comparison-of-caipirinha-vibe-technique-with-conventional-vibe-sequences-in-contrast-enhanced-mri-of-focal-liver-lesions
#11
COMPARATIVE STUDY
M H Albrecht, B Bodelle, A Varga-Szemes, P Dewes, A M Bucher, B D Ball, C N De Cecco, U J Schoepf, X Zhu, S Zangos, T Gruber-Rouh, J L Wichmann, T Lehnert, T J Vogl
PURPOSE: To evaluate the impact of controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA) volume interpolated breath-hold examination (VIBE) magnetic resonance imaging (MRI) technique on image quality, reader confidence, and inter-observer agreement for the assessment of focal liver lesions in comparison with the standard VIBE approach. MATERIAL AND METHODS: In this IRB-approved intra-individual comparison study, abdominal arterial and portal-venous contrast-enhanced MRI studies were retrospectively analyzed in 38 patients with malignant liver lesions...
January 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/27940372/arterial-phase-with-caipirinha-dixon-twist-cdt-volume-interpolated-breath-hold-examination-vibe-in-detecting-hepatic-metastases
#12
Jinrong Qu, Shuai Han, Hongkai Zhang, Hui Liu, Zhaoqi Wang, Ihab R Kamel, Kiefer Berthold, Nickel Marcel Dominik, Jianwei Zhang, Shouning Zhang, Yafeng Dong, Lina Jiang, Cuicui Liu, Hailiang Li
PURPOSE: To evaluate lesion enhancement performance of Multi-Arterial CAIPIRINHA-Dixon-TWIST-Volume-Interpolated Breath-Hold Examination (MA-CDT-VIBE) for the detection of hepatic metastases. MATERIALS AND METHODS: Thirty-one patients with suspicious hepatic metastases were enrolled in this retrospective study. Two independent radiologists scored visualization of each lesion on a scale of 1 (poor visualization) to 11 (excellent visualization) on 11 sets of images...
February 2017: Translational Oncology
https://www.readbyqxmd.com/read/27867177/image-quality-characteristics-of-the-3d-parallel-imaging-method-caipirinha-in-abdominal-mri
#13
Ryohei Hatakeyama, Takeshi Makabe, Manami Karino, Ayaka Sasaki, Arisa Takami, Takuma Umemura, Hiroyuki Uno
This study investigated the image quality using controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA) to shorten the imaging time in dynamic abdominal examinations. Comparisons with the conventional generalized autocalibrating partially parallel acquisitions (GRAPPA) method were made by changing the sampling shift in CAIPIRINHA using a 3.0 T MRI. The measurements included the visual evaluation of five stages, the signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) in phantom experiments...
2016: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/27867088/techniques-for-blood-volume-fmri-with-vaso-from-low-resolution-mapping-towards-sub-millimeter-layer-dependent-applications
#14
Laurentius Huber, Dimo Ivanov, Daniel A Handwerker, Sean Marrett, Maria Guidi, Kâmil Uludağ, Peter A Bandettini, Benedikt A Poser
Quantitative cerebral blood volume (CBV) fMRI has the potential to overcome several specific limitations of BOLD fMRI. It provides direct physiological interpretability and promises superior localization specificity in applications of sub-millimeter resolution fMRI applications at ultra-high magnetic fields (7T and higher). Non-invasive CBV fMRI using VASO (vascular space occupancy), however, is inherently limited with respect to its data acquisition efficiency, restricting its imaging coverage and achievable spatial and temporal resolution...
November 18, 2016: NeuroImage
https://www.readbyqxmd.com/read/27825954/ultra-high-resolution-brain-metabolite-mapping-at-7-t-by-short-tr-hadamard-encoded-fid-mrsi
#15
Gilbert Hangel, Bernhard Strasser, Michal Považan, Eva Heckova, Lukas Hingerl, Roland Boubela, Stephan Gruber, Siegfried Trattnig, Wolfgang Bogner
MRSI in the brain at ≥7T is a technique of great promise, but has been limited mainly by low B0/B1(+)-homogeneity, specific absorption rate restrictions, long measurement times, and low spatial resolution. To overcome these limitations, we propose an ultra-high resolution (UHR) MRSI sequence that provides a 128×128 matrix with a nominal voxel volume of 1.7×1.7×8 mm³ in a comparatively short measurement time. A clinically feasible scan time of 10-20min is reached via a short TR of 200 ms due to an optimised free induction decay-based acquisition with shortened water suppression as well as parallel imaging (PI) using Controlled Aliasing In Parallel Imaging Results IN Higher Acceleration (CAIPIRINHA)...
November 4, 2016: NeuroImage
https://www.readbyqxmd.com/read/27776645/simultaneous-multi-slice-echo-planar-diffusion-weighted-imaging-of-the-liver-and-the-pancreas-optimization-of-signal-to-noise-ratio-and-acquisition-time-and-application-to-intravoxel-incoherent-motion-analysis
#16
Andreas Boss, Borna Barth, Lukas Filli, David Kenkel, Moritz C Wurnig, Marco Piccirelli, Caecilia S Reiner
PURPOSE: To optimize and test a diffusion-weighted imaging (DWI) echo-planar imaging (EPI) sequence with simultaneous multi-slice (SMS) excitation in the liver and pancreas regarding acquisition time (TA), number of slices, signal-to-noise ratio (SNR), image quality (IQ), apparent diffusion coefficient (ADC) quantitation accuracy, and feasibility of intravoxel incoherent motion (IVIM) analysis. MATERIALS AND METHODS: Ten healthy volunteers underwent DWI of the upper abdomen at 3T...
November 2016: European Journal of Radiology
https://www.readbyqxmd.com/read/27548836/-2%C3%A2-%C3%A2-1-d-caipirinha-accelerated-mr-spectroscopic-imaging-of-the-brain-at-7t
#17
B Strasser, M Považan, G Hangel, L Hingerl, M Chmelik, S Gruber, S Trattnig, W Bogner
PURPOSE: To compare a new parallel imaging (PI) method for multislice proton magnetic resonance spectroscopic imaging ((1) H-MRSI), termed (2 + 1)D-CAIPIRINHA, with two standard PI methods: 2D-GRAPPA and 2D-CAIPIRINHA at 7 Tesla (T). METHODS: (2 + 1)D-CAIPIRINHA is a combination of 2D-CAIPIRINHA and slice-CAIPIRINHA. Eight healthy volunteers were measured on a 7T MR scanner using a 32-channel head coil. The best undersampling patterns were estimated for all three PI methods...
August 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27524666/towards-real-time-thermometry-using-simultaneous-multislice-mri
#18
P T S Borman, C Bos, T de Boorder, B W Raaymakers, C T W Moonen, S P M Crijns
MR-guided thermal therapies, such as high-intensity focused ultrasound (MRgHIFU) and laser-induced thermal therapy (MRgLITT) are increasingly being applied in oncology and neurology. MRI is used for guidance since it can measure temperature noninvasively based on the proton resonance frequency shift (PRFS). For therapy guidance using PRFS thermometry, high temporal resolution and large spatial coverage are desirable. We propose to use the parallel imaging technique simultaneous multislice (SMS) in combination with controlled aliasing (CAIPIRINHA) to accelerate the acquisition...
September 7, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27504684/feasibility-of-free-breathing-dynamic-contrast-enhanced-mri-of-the-abdomen-a-comparison-between-caipirinha-vibe-radial-vibe-with-kwic-reconstruction-and-conventional-vibe
#19
COMPARATIVE STUDY
Nieun Seo, Seong J Park, Bohyun Kim, Chang K Lee, Jimi Huh, Jeong K Kim, Seung S Lee, In S Kim, Dominik Nickel, Kyung W Kim
OBJECTIVE: 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)...
October 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27502698/radial-simultaneous-multi-slice-caipi-for-ungated-myocardial-perfusion
#20
Haonan Wang, Ganesh Adluru, Liyong Chen, Eugene G Kholmovski, Neal K Bangerter, Edward V R DiBella
OBJECTIVE: Simultaneous multi-slice (SMS) imaging is a slice acceleration technique that acquires multiple slices in the same time as a single slice. Radial controlled aliasing in parallel imaging results in higher acceleration (radial CAIPIRINHA or CAIPI) is a promising SMS method with less severe slice aliasing artifacts as compared to its Cartesian counterpart. Here we use radial CAIPI with data undersampling and constrained reconstruction to improve the utility of ungated cardiac perfusion acquisitions...
November 2016: Magnetic Resonance Imaging
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