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https://www.readbyqxmd.com/read/29901511/contrast-enhanced-magnetic-resonance-imaging-of-pelvic-bone-metastases-at-3-0-t-comparison-between-3-dimensional-t1-weighted-caipirinha-vibe-sequence-and-2-dimensional-t1-weighted-turbo-spin-echo-sequence
#1
Min A Yoon, Suk-Joo Hong, Kyu-Chong Lee, Chang Hee Lee
OBJECTIVE: This study aimed to compare 3-dimensional T1-weighted gradient-echo sequence (CAIPIRINHA-volumetric interpolated breath-hold examination [VIBE]) with 2-dimensional T1-weighted turbo spin-echo sequence for contrast-enhanced magnetic resonance imaging (MRI) of pelvic bone metastases at 3.0 T. METHODS: Thirty-one contrast-enhanced MRIs of pelvic bone metastases were included. Two contrast-enhanced sequences were evaluated for the following parameters: overall image quality, sharpness of pelvic bone, iliac vessel clarity, artifact severity, and conspicuity and edge sharpness of the smallest metastases...
June 12, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29770492/accelerated-3d-grase-imaging-improves-quantitative-multiple-post-labeling-delay-arterial-spin-labeling
#2
Markus Boland, Rüdiger Stirnberg, Eberhard D Pracht, Johanna Kramme, Roberto Viviani, Julia Stingl, Tony Stöcker
PURPOSE: To investigate the impact of accelerated, single-shot 3D-GRASE acquisition on quantitative arterial spin labeling (ASL) with multiple and single post-labeling delay (PLD) in terms of perfusion-weighted SNR per unit scan time (TSNRPW ) and quantification accuracy. METHODS: Five subjects were scanned on a 3T MRI scanner using the pseudo-continuous arterial spin labeling (PCASL) technique with a 3D-GRASE imaging sequence capable of parallel imaging acceleration...
May 16, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29663507/grappa-reconstructed-wave-caipi-mp-rage-at-7-tesla
#3
Jolanda M Schwarz, Eberhard D Pracht, Daniel Brenner, Martin Reuter, Tony Stöcker
PURPOSE: The aim of this project was to develop a GRAPPA-based reconstruction for wave-CAIPI data. Wave-CAIPI fully exploits the 3D coil sensitivity variations by combining corkscrew k-space trajectories with CAIPIRINHA sampling. It reduces artifacts and limits reconstruction induced spatially varying noise enhancement. The GRAPPA-based wave-CAIPI method is robust and does not depend on the accuracy of coil sensitivity estimations. METHODS: We developed a GRAPPA-based, noniterative wave-CAIPI reconstruction algorithm utilizing multiple GRAPPA kernels...
April 16, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29520372/highly-accelerated-ssfp-imaging-with-controlled-aliasing-in-parallel-imaging-and-integrated-ssfp-caipi-issfp
#4
Thomas Martin, Yi Wang, Shams Rashid, Xingfeng Shao, Steen Moeller, Peng Hu, Kyunghyun Sung, Danny Jj Wang
Purpose: To develop a novel combination of controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA) with integrated SSFP (CAIPI-iSSFP) for accelerated SSFP imaging without banding artifacts at 3T. Materials and Methods: CAIPI-iSSFP was developed by adding a dephasing gradient to the balanced SSFP (bSSFP) pulse sequence with a gradient area that results in 2π dephasing across a single pixel. Extended phase graph (EPG) simulations were performed to show the signal behaviors of iSSFP, bSSFP, and RF-spoiled gradient echo (SPGR) sequences...
December 2017: Investigative magnetic resonance imaging
https://www.readbyqxmd.com/read/29468727/simultaneous-multislice-triple-echo-steady-state-sms-tess-t-1-t-2-pd-and-off-resonance-mapping-in-the-human-brain
#5
Rahel Heule, Zarko Celicanin, Sebastian Kozerke, Oliver Bieri
PURPOSE: To investigate the ability of simultaneous multislice triple-echo steady-state (SMS-TESS) imaging to provide quantitative maps of multiple tissue parameters, i.e., longitudinal and transverse relaxation times (T1 and T2 ), proton density (PD), and off-resonance (ΔB0 ), in the human brain at 3T from a single scan. METHODS: TESS acquisitions were performed in 2D mode to reduce motion sensitivity and accelerated by an SMS excitation scheme (CAIPIRINHA) with SENSE reconstruction...
February 21, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29299818/influence-of-the-reference-scan-and-scan-time-on-the-arterial-phase-of-liver-magnetic-resonance-imaging
#6
Yoshinori Tsuji, Satoshi Saitoh, Junji Takahashi, Chisato Abe, Tatsuya Hayashi, Masahiro Kobayashi
The controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA) technique can decrease scan time. The purpose of this study was to determine whether an arterial phase scan can be performed in 5 s using the CAIPIRINHA short-scan and a reference scanning technique. The generalized autocalibrating partially parallel acquisition (GRAPPA), the CAIPIRINHA routine (CAIPI-routine), and the CAIPIRINHA short-scanning (CAIPI-short) methods were compared. The scan time for each method was preset to 20 s, 15 s, and 10 s, respectively...
March 2018: Radiological Physics and Technology
https://www.readbyqxmd.com/read/29279164/clinical-application-of-half-fourier-acquisition-single-shot-turbo-spin-echo-haste-imaging-accelerated-by-simultaneous-multi-slice-acquisition
#7
Jenni Schulz, José P Marques, Annemieke Ter Telgte, Anouk van Dorst, Frank-Erik de Leeuw, Frederick J A Meijer, David G Norris
As a single-shot sequence with a long train of refocusing pulses, Half-Fourier Acquisition Single-Shot Turbo-Spin-Echo (HASTE) suffers from high power deposition limiting use at high resolutions and high field strengths, particularly if combined with acceleration techniques such as simultaneous multi-slice (SMS) imaging. Using a combination of multiband (MB)-excitation and PINS-refocusing pulses will effectively accelerate the acquisition time while staying within the SAR limitations. In particular, uncooperative and young patients will profit from the speed of the MB-PINS HASTE sequence, as clinical diagnosis can be possible without sedation...
January 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29128992/mapping-of-hepatic-vasculature-in-potential-living-liver-donors-comparison-of-gadoxetic-acid-enhanced-mr-imaging-using-caipirinha-technique-with-ct-angiography
#8
Kartik Jhaveri, Lijun Guo, Luís Guimarães, Ravi Menezes, Ian McGilvray, Mark Cattral, David Grant
PURPOSE: To retrospectively evaluate gadoxetic acid-enhanced magnetic resonance angiography (MRA) using controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA) technique for mapping hepatic vascular anatomy in potential living liver donors, with CT angiography (CTA) as reference standard. METHODS: 82 potential living liver donors who underwent MRA and CTA were enrolled in this HIPAA-compliant IRB-approved study. MRA and CTA images were evaluated by two reviewers in consensus with respect to (1) image quality scores for depiction of the hepatic vessels and (2) accuracy of MRA for determining the hepatic vascular variants with CTA as reference standard...
November 11, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/29103469/improved-clinical-workflow-for-simultaneous-whole-body-pet-mri-using-high-resolution-caipirinha-accelerated-mr-based-attenuation-correction
#9
Martin T Freitag, Matthias Fenchel, Philipp Bäumer, Thorsten Heußer, Christopher M Rank, Marc Kachelrieß, Daniel Paech, Klaus Kopka, Sebastian Bickelhaupt, Antonia Dimitrakopoulou-Strauss, Klaus Maier-Hein, Ralf Floca, Mark E Ladd, Heinz-Peter Schlemmer, Florian Maier
PURPOSE: To explore the value and reproducibility of a novel magnetic resonance based attenuation correction (MRAC) using a CAIPIRINHA-accelerated T1-weighted Dixon 3D-VIBE sequence for whole-body PET/MRI compared to the clinical standard. METHODS: The PET raw data of 19 patients from clinical routine were reconstructed with standard MRAC (MRACstd) and the novel MRAC (MRACcaipi), a prototype CAIPIRINHA accelerated Dixon 3D-VIBE sequence, both acquired in 19 s/bed position...
November 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28923276/rapid-whole-brain-resting-state-fmri-at-3-t-efficiency-optimized-three-dimensional-epi-versus-repetition-time-matched-simultaneous-multi-slice-epi
#10
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...
December 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
#11
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...
May 2018: 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
#12
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...
March 2018: 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
#13
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
#14
COMPARATIVE STUDY
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
#15
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
#16
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
#17
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...
January 2018: 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
#18
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...
January 2018: 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
#19
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
#20
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
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