keyword
MENU ▼
Read by QxMD icon Read
search

Caipirinha

keyword
https://www.readbyqxmd.com/read/27867177/image-quality-characteristics-of-the-3d-parallel-imaging-method-caipirinha-in-abdominal-mri
#1
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
#2
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 17, 2016: NeuroImage
https://www.readbyqxmd.com/read/27825954/ultra-high-resolution-brain-metabolite-mapping-at-7-t-by-short-tr-hadamard-encoded-fid-mrsi
#3
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
#4
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
#5
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 22, 2016: 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
#6
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
#7
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
#8
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
https://www.readbyqxmd.com/read/27457791/caipirinha-accelerated-t1w-3d-flash-for-small-bowel-mr-imaging-in-pediatric-patients-with-crohn-disease-assessment-of-image-quality-and-diagnostic-performance
#9
Mengxia Li, Anke Dick, Nicole Hassold, Thomas Pabst, Thorsten Bley, Herbert Köstler, Henning Neubauer
BACKGROUND: The "Controlled Aliasing In Parallel Imaging Results In Higher Acceleration" (CAPIRINHA) technique greatly accelerates T1w 3D fast low angle shot (FLASH) scans while maintaining high image quality. We studied image quality and conspicuity of inflammatory lesions on CAIPIRINHA-accelerated imaging for pediatric small-bowel magnetic resonance imaging (MRI). METHODS: Forty-four consecutive patients (mean 14±3 years, 18 girls) underwent small-bowel MRI (MR enterography, MRE) at 1...
July 23, 2016: World Journal of Pediatrics: WJP
https://www.readbyqxmd.com/read/27208151/genetic-parameters-for-growth-characteristics-of-free-range-chickens-under-univariate-random-regression-models
#10
Gregori A Rovadoscki, Juliana Petrini, Johanna Ramirez-Diaz, Simone F N Pertile, Fábio Pertille, Mayara Salvian, Laiza H S Iung, Mary Ana P Rodriguez, Aline Zampar, Leila G Gaya, Rachel S B Carvalho, Antonio A D Coelho, Vicente J M Savino, Luiz L Coutinho, Gerson B Mourão
Repeated measures from the same individual have been analyzed by using repeatability and finite dimension models under univariate or multivariate analyses. However, in the last decade, the use of random regression models for genetic studies with longitudinal data have become more common. Thus, the aim of this research was to estimate genetic parameters for body weight of four experimental chicken lines by using univariate random regression models. Body weight data from hatching to 84 days of age (n = 34,730) from four experimental free-range chicken lines (7P, Caipirão da ESALQ, Caipirinha da ESALQ and Carijó Barbado) were used...
September 1, 2016: Poultry Science
https://www.readbyqxmd.com/read/27187045/three-dimensional-caipirinha-space-tse-for-5-minute-high-resolution-mri-of-the-knee
#11
Jan Fritz, Benjamin Fritz, Gaurav G Thawait, Heiko Meyer, Wesley D Gilson, Esther Raithel
OBJECTIVE: The aim of this study was to prospectively test the hypothesis that a 2-dimensional (2D) CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration) sampling pattern facilitates 5-minute high spatial resolution 3-dimensional (3D) sampling perfection with application optimized contrast using different flip angle evolutions (SPACE) magnetic resonance imaging (MRI) of the knee with image quality similar or better than current 2D turbo spin echo (TSE) and 3D SPACE standards...
October 2016: Investigative Radiology
https://www.readbyqxmd.com/read/27175547/improved-detection-of-recurrent-hepatocellular-carcinomas-in-arterial-phase-with-caipirinha-dixon-twist-volumetric-interpolated-breath-hold-examination
#12
Jinrong Qu, Shuai Han, Hongkai Zhang, Hui Liu, Zhaoqi Wang, Ihab R Kamel, Kiefer Berthold, Nickel Marcel Dominik, Shouning Zhang, Yafeng Dong, Lina Jiang, Cuicui Liu, Hailiang Li
PURPOSE: The aim of this study was to assess the detection rate of recurrent hepatocellular carcinoma (HCC) in arterial phase using multiarterial CAIPIRINHA-Dixon-TWIST-VIBE (MA-CDT-VIBE). MATERIALS AND METHODS: Fifty-eight patients with possible recurrence of HCC were retrospectively included in this cohort. Patients were scanned with a prototype dynamic contrast-enhanced breath-hold CDT-VIBE sequence, which included 6 arterial subphases with a temporal resolution of 2...
October 2016: Investigative Radiology
https://www.readbyqxmd.com/read/26949107/simultaneous-multislice-imaging-in-dynamic-cardiac-mri-at-7t-using-parallel-transmission
#13
Sebastian Schmitter, Steen Moeller, Xiaoping Wu, Edward J Auerbach, Gregory J Metzger, Pierre-François Van de Moortele, Kâmil Uğurbil
PURPOSE: Cardiac MRI at 7T suffers from contrast heterogeneity that can be mitigated with parallel transmission (pTX) and, when performed during breath-hold, from a limited number of slices that can be multiplied with multiband (MB) radiofrequency pulses by simultaneous excitation of multiple slices (SMS). The goal of this study was to apply both approaches simultaneously. METHODS: Using a 16-channel transmit/receive body coil, pTX SMS was applied with/without CAIPIRINHA with a modified gradient echo cine sequence...
March 7, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/26836647/multi-slice-image-generation-using-intra-slice-parallel-imaging-and-inter-slice-shifting-maggulli
#14
Dongchan Kim, Hyunseok Seo, Changheun Oh, Yeji Han, HyunWook Park
For acceleration of imaging time, multi-band imaging techniques (e.g. CAIPIRINHA) use the sensitivity differences of the multi-channel RF coils in the slice selection direction. To more effectively utilize the RF coil characteristics than the conventional multi-band imaging techniques, we propose a new imaging technique, called multi-slice image generation using intra-slice parallel imaging and inter-slice shifting (MAGGULLI). The proposed technique used an inter-slice shifting gradient in slice selection direction to make multi-slice images shift in the frequency encoding direction...
February 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/26809293/feasibility-of-test-bolus-dce-mri-using-caipirinha-vibe-for-the-evaluation-of-pancreatic-malignancies
#15
Jimi Huh, Yoonseok Choi, Dong-Cheol Woo, Nieun Seo, Bohyun Kim, Chang Kyung Lee, In Seong Kim, Dominik Nickel, Kyung Won Kim
OBJECTIVES: To evaluate the feasibility of test-bolus dynamic contrast-enhanced (DCE) MRI with CAIPIRINHA-VIBE for pancreatic malignancies. METHODS: Thirty-two patients underwent DCE-MRI with CAIPIRINHA-VIBE after injection of 2 mL gadolinium. From the resulting time-intensity curve (TIC), we estimated the arterial (AP) and portal venous phase (PVP) scan timing for subsequent multiphasic MRI. DCE-MRI perfusion maps were generated, and perfusion parameters were calculated...
January 25, 2016: European Radiology
https://www.readbyqxmd.com/read/26807896/the-short-breath-hold-technique-controlled-aliasing-in-parallel-imaging-results-in-higher-acceleration-can-be-the-first-step-to-overcoming-a-degraded-hepatic-arterial-phase-in-liver-magnetic-resonance-imaging-a-prospective-randomized-control-study
#16
Jung Lim Yoo, Chang Hee Lee, Yang Shin Park, Jeong Woo Kim, Jongmee Lee, Kyeong Ah Kim, Hae Young Seol, Cheol Min Park
OBJECTIVE: The aim of this study was to assess whether a short breath-hold technique can improve hepatic arterial phase (HAP) image quality in gadoxetic acid-enhanced magnetic resonance (MR) imaging compared with a conventional long breath-hold technique. MATERIALS AND METHODS: Institutional review board approval and patient consent were obtained for this prospective randomized control study. One hundred nineteen patients undergoing gadoxetic acid-enhanced MR imaging were randomly assigned to groups A or B...
July 2016: Investigative Radiology
https://www.readbyqxmd.com/read/26747409/comparison-of-caipirinha-vibe-radial-vibe-and-conventional-vibe-sequences-for-dynamic-contrast-enhanced-dce-mri-a-validation-study-using-a-dce-mri-phantom
#17
Bohyun Kim, Chang Kyung Lee, Nieun Seo, Seung Soo Lee, Jeong Kon Kim, Yoonseok Choi, Dong-Cheol Woo, In Seong Kim, Dominik Nickel, Kyung Won Kim
OBJECTIVE: To validate radial acquisition of volumetric interpolated breath hold examination (Radial-VIBE) and the controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA-VIBE) sequences for dynamic contrast-enhanced MRI (DCE-MRI) by comparing them to conventional VIBE sequence using a phantom. METHODS: On a DCE-MRI phantom containing various concentrations of NiCl2 solutions, six minutes of dynamic series and T1 mapping with variable flip angle methods were acquired using conventional VIBE, Radial-VIBE, and CAIPIRINHA-VIBE sequences on 3...
June 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/26684245/an-optimization-framework-to-maximize-signal-to-noise-ratio-in-simultaneous-multi-slice-body-imaging
#18
Bjorn Stemkens, Alessandro Sbrizzi, Anna A Andreychenko, Sjoerd P M Crijns, Jan J W Lagendijk, Cornelis A T van den Berg, Rob H N Tijssen
Parallel imaging is essential for the acceleration of abdominal and pelvic 2D multi-slice imaging, in order to reduce scan time and mitigate motion artifacts. Controlled Aliasing In Parallel Imaging Results IN Higher Acceleration (CAIPIRINHA) accelerated imaging has been shown to increase the signal-to-noise ratio (SNR) significantly compared with in-plane parallel imaging with similar acceleration. We hypothesize that for CAIPIRINHA-accelerated abdominal imaging the consistency of image quality and SNR is more difficult to achieve due to the subject-specific coil sensitivity profiles, caused by (1) flexible coil placement; (2) variations in anatomy; and (3) variations in scan coverage along the superior-inferior direction...
March 2016: NMR in Biomedicine
https://www.readbyqxmd.com/read/26667600/phase-cycled-simultaneous-multislice-balanced-ssfp-imaging-with-caipirinha-for-efficient-banding-reduction
#19
Yi Wang, Xingfeng Shao, Thomas Martin, Steen Moeller, Essa Yacoub, Danny J J Wang
PURPOSE: To present a time-efficient technique for banding reduction in balanced steady-state free precession (bSSFP) imaging using phase-cycled simultaneous multislice (SMS) acquisition with CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration). THEORY: The proposed technique exploits the inherent phase modulation of SMS imaging with CAIPIRINHA to acquire multiple phase-cycled images, which can be combined for efficient banding reduction within the same scan time of a single-band bSSFP scan...
December 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/26619282/effect-of-temporal-resolution-on-diagnostic-performance-of-dynamic-contrast-enhanced-magnetic-resonance-imaging-of-the-prostate
#20
Ahmed E Othman, Florian Falkner, Jakob Weiss, Stephan Kruck, Robert Grimm, Petros Martirosian, Konstantin Nikolaou, Mike Notohamiprodjo
OBJECTIVE: The aim of this study was to assess the effect of temporal resolution on semiquantitative and pharmacokinetic parameters from dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) and their diagnostic accuracy regarding the detection of potentially malignant prostate lesions. MATERIALS AND METHODS: Sixty consecutive male patients (age, 64.5 ± 7.0 years) with clinically suspected prostate cancer were included. All patients underwent multiparametric MRI of the prostate (T2-weighted, diffusion-weighted imaging, and DCE-MRI) on a 3 T MRI scanner...
May 2016: Investigative Radiology
keyword
keyword
86953
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"