Motivation: This is a competing renewal of our successful project Rapid Robust Pediatric MRI, R01 EB009690. MRI offers superb soft tissue contrast and high resolution for children, without the ionizing radiation and cancer risk of CT. However, its use has been limited as children often cannot voluntarily suspend respiration or tolerate long exams. MRI often requires anesthesia with attendant risk;hence, children often lack the benefits of cross-sectional imaging altogether or are exposed to ionizing radiation. The previous project addressed these concerns by creating a dedicated pediatric imaging system. Highly parallel, high SNR 3T receive arrays were designed and constructed specifically for pediatric body imaging. The high SNR was used to accelerate scans reconstructed with a combination of parallel imaging, new motion correction algorithms, and compressed sensing (CS). Parallel computing reconstruction algorithms produced 3D volumes in 1 minute. The resulting system is being used extensively in clinical practice, significantly reducing anesthesia, and has markedly increased our abdominal MRI utilization. Key technologies are now being commercialized with GE Healthcare, including the pediatric receive array, CS, and coil compression. Despite significant progress, with markedly reduced scan times, anesthesia has not been eliminated. Patient motion remains the main limitation. Therefore the major emphasis here is addressing motion through robust imaging, motion correction, and dynamic MRI. This will (1) extend the benefits of MRI to younger, less cooperative patients, (2) allow the correction and depiction of respiratory motion, and (3) provide the temporal resolution that captures the faster contrast dynamics in children for free-breathing 3D dynamic studies. Approach: The project has three interrelated development aims, validated by clinical studies.
Aim 1 is to enable robust acquisition and reconstruction in the presence of motion in 3D studies. This uses robust parallel imaging calibration and reconstruction, outlier insensitive optimization and a new approach for measuring localized non-rigid motion throughout the body using array coil elements.
A second aim i s to develop ultrafast multi band 2D approaches for faster imaging of uncooperative patients. This freezes motion in each set of slices, simplifying motion correction over the volume. The impact of these developments in the clinic will then be assessed in the setting of appendicitis, a representative common and challenging pediatric abdominal imaging application. Then we will exploit temporal correlations and dynamics in time-resolved 3D contrast studies and further speed 2D scans, and again assess the impact in children with suspected appendicitis. Significance: This work will lead to fast, robust, broadly-applicable pediatric body MRI protocols with less anesthesia, making MRI safer, cheaper, and more available to children, transforming it into a workhorse modality and decreasing CT radiation burden. The techniques will facilitate wide application in the community setting and permit new MRI applications, for both pediatric and adult disease.
Clinical pediatric MRI has been limited primarily by inadequate spatial resolution and patient motion, which often requires anesthesia. After considerable progress to make MRI faster and sharper to enable diagnostic imaging, this work aims to completely address motion through a synergistic combination of motion correction and ultrafast scanning. Ultimately this will make MRI more widely available to children, reducing the overall population risk of radiation from CT and additionally improving MRI in adults.
|Uecker, Martin; Lustig, Michael (2017) Estimating absolute-phase maps using ESPIRiT and virtual conjugate coils. Magn Reson Med 77:1201-1207|
|Lai, Lillian M; Cheng, Joseph Y; Alley, Marcus T et al. (2017) Feasibility of ferumoxytol-enhanced neonatal and young infant cardiac MRI without general anesthesia. J Magn Reson Imaging 45:1407-1418|
|Gibbons, Eric K; Le Roux, Patrick; Vasanawala, Shreyas S et al. (2017) Body Diffusion Weighted Imaging Using Non-CPMG Fast Spin Echo. IEEE Trans Med Imaging 36:549-559|
|Cheng, Joseph Y; Zhang, Tao; Alley, Marcus T et al. (2017) Comprehensive Multi-Dimensional MRI for the Simultaneous Assessment of Cardiopulmonary Anatomy and Physiology. Sci Rep 7:5330|
|Ong, Frank; Cheng, Joseph Y; Lustig, Michael (2017) General phase regularized reconstruction using phase cycling. Magn Reson Med :|
|Loening, Andreas M; Litwiller, Daniel V; Saranathan, Manojkumar et al. (2017) Increased Speed and Image Quality for Pelvic Single-Shot Fast Spin-Echo Imaging with Variable Refocusing Flip Angles and Full-Fourier Acquisition. Radiology 282:561-568|
|Tamir, Jonathan I; Uecker, Martin; Chen, Weitian et al. (2017) T2 shuffling: Sharp, multicontrast, volumetric fast spin-echo imaging. Magn Reson Med 77:180-195|
|Zhang, Tao; Grafendorfer, Thomas; Cheng, Joseph Y et al. (2016) A semiflexible 64-channel receive-only phased array for pediatric body MRI at 3T. Magn Reson Med 76:1015-21|
|Hanneman, Kate; Kino, Aya; Cheng, Joseph Y et al. (2016) Assessment of the precision and reproducibility of ventricular volume, function, and mass measurements with ferumoxytol-enhanced 4D flow MRI. J Magn Reson Imaging 44:383-92|
|Ong, Frank; Lustig, Michael (2016) Beyond Low Rank + Sparse: Multi-scale Low Rank Matrix Decomposition. IEEE J Sel Top Signal Process 10:672-687|
Showing the most recent 10 out of 43 publications