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Caipirinha abdomen

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
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
Mengxia Li, Beate Winkler, Thomas Pabst, Thorsten Bley, Herbert Köstler, Henning Neubauer
The aim of this study was to explore the applicability of fast MR techniques to routine paediatric abdominopelvic MRI at 1.5 Tesla. "Controlled Aliasing in Parallel Imaging Results in Higher Acceleration-" (CAIPIRINHA-) accelerated contrast-enhanced-T1w 3D FLASH imaging was compared to standard T1w 2D FLASH imaging with breath-holding in 40 paediatric patients and to respiratory-triggered T1w TSE imaging in 10 sedated young children. In 20 nonsedated patients, we compared T2w TIRM to fat-saturated T2w HASTE imaging...
2015: Gastroenterology Research and Practice
Mamdoh AlObaidy, Miguel Ramalho, Kiran K R Busireddy, Baodong Liu, Lauren M Burke, Ersan Altun, Brian M Dale, Richard C Semelka
OBJECTIVES: To assess the feasibility of high-resolution 3D-gradient-recalled echo (GRE) fat-suppressed T1-weighted images using controlled aliasing acceleration technique (CAIPIRINHA-VIBE), and compare image quality and lesion detection to standard-resolution 3D-GRE images using conventional acceleration technique (GRAPPA-VIBE). MATERIALS AND METHODS: Eighty-four patients (41 males, 43 females; age range: 14-90 years, 58.8 ± 15.6 years) underwent abdominal MRI at 1...
December 2015: European Radiology
Paul T Weavers, Eric A Borisch, Stephen J Riederer
PURPOSE: To develop and validate a method for choosing the optimal two-dimensional CAIPIRINHA kernel for subtraction contrast-enhanced MR angiography (CE-MRA) and estimate the degree of image quality improvement versus that of some reference acceleration parameter set at R ≥ 8. METHODS: A metric based on patient-specific coil calibration information was defined for evaluating optimality of CAIPIRINHA kernels as applied to subtraction CE-MRA. Evaluation in retrospective studies using archived coil calibration data from abdomen, calf, foot, and hand CE-MRA exams was accomplished with an evaluation metric comparing the geometry factor (g-factor) histograms...
June 2015: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Zarko Celicanin, Oliver Bieri, Frank Preiswerk, Philippe Cattin, Klaus Scheffler, Francesco Santini
PURPOSE: Respiratory organ motion is still the major challenge of various image-guided treatments in the abdomen. Dynamic organ motion tracking, necessary for the treatment control, can be performed with volumetric time-resolved MRI that sequentially acquires one image and one navigator slice. Here, a novel imaging method is proposed for truly simultaneous high temporal resolution acquisition. METHODS: A standard balanced steady state free precession sequence was modified to simultaneously acquire two superimposed slices with different phase cycles, namely an image and a navigator slice...
February 2015: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Katherine L Wright, Michael W Harrell, John A Jesberger, Luis Landeras, Dean A Nakamoto, Smitha Thomas, Dominik Nickel, Randall Kroeker, Mark A Griswold, Vikas Gulani
PURPOSE: To evaluate image quality when using a CAIPIRINHA sampling pattern in comparison to a standard GRAPPA sampling pattern in patients undergoing a routine three-dimensional (3D) breathheld liver exam. CAIPIRINHA uses an optimized phase encoding sampling strategy to alter aliasing artifacts in 3D acquisitions to improve parallel imaging reconstruction. MATERIALS AND METHODS: Twenty patient volunteers were scanned using a 3D VIBE acquisition with an acceleration factor of four using a CAIPIRINHA and standard GRAPPA sampling pattern...
January 2014: Journal of Magnetic Resonance Imaging: JMRI
Henrik J Michaely, John N Morelli, Johannes Budjan, Philipp Riffel, Dominik Nickel, Randall Kroeker, Stefan O Schoenberg, Ulrike I Attenberger
PURPOSE: The purpose of this study was to assess the feasibility and image quality of a novel, highly accelerated T1-weighted sequence for time-resolved imaging of the abdomen during the first pass of contrast media transit using controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA) under sampling, view-sharing techniques, and Dixon water-fat separation (CAIPRINHA-Dixon-time-resolved imaging with interleaved stochastic trajectories-volumetric interpolated breath-hold examination [CDT-VIBE])...
August 2013: Investigative Radiology
Philipp Riffel, Ulrike I Attenberger, Stephan Kannengiesser, Marcel D Nickel, Carolyn Arndt, Mathias Meyer, Stefan O Schoenberg, Henrik J Michaely
PURPOSE: The purpose of this study was to evaluate the feasibility and technical quality of an abdominal 3-dimensional interpolated breath-hold (volumetric interpolated breath-hold examination [VIBE]) magnetic resonance examination using the new parallel acquisition technique, controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA). MATERIALS AND METHODS: In this institutional review board-approved study, 15 volunteers underwent an abdominal magnetic resonance imaging examination including axial unenhanced 3-dimensional VIBE sequences with the conventional parallel acquisition technique, generalized autocalibrating partially parallel acquisitions parallel imaging (GRAPPA), with an acceleration factor (R) of 2, 3, 4, and 2 × 2 in comparison with a CAIPIRINHA-VIBE sequence with an acceleration factor of 2 × 2...
July 2013: Investigative Radiology
Felix A Breuer, Martin Blaimer, Robin M Heidemann, Matthias F Mueller, Mark A Griswold, Peter M Jakob
In all current parallel imaging techniques, aliasing artifacts resulting from an undersampled acquisition are removed by means of a specialized image reconstruction algorithm. In this study a new approach termed "controlled aliasing in parallel imaging results in higher acceleration" (CAIPIRINHA) is presented. This technique modifies the appearance of aliasing artifacts during the acquisition to improve the subsequent parallel image reconstruction procedure. This new parallel multi-slice technique is more efficient compared to other multi-slice parallel imaging concepts that use only a pure postprocessing approach...
March 2005: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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