fast pediatric mri - par labparlab.eecs.berkeley.edu/sites/all/parlab/files/fast pediatric...
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![Page 1: Fast Pediatric MRI - Par Labparlab.eecs.berkeley.edu/sites/all/parlab/files/Fast Pediatric MRI.pdf · Fast Pediatric MRI Shreyas Vasanawala, MD/PhD Stanford University Lucile Packard](https://reader036.vdocuments.us/reader036/viewer/2022070803/5f0319657e708231d40787bd/html5/thumbnails/1.jpg)
Stanford Radiology LPCH
Fast Pediatric MRI
Shreyas Vasanawala, MD/PhD
Stanford University
Lucile Packard Children’s Hospital
2013 Par Lab Celebration
How fast computation is changing our clinical practice
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Stanford Radiology LPCH
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Stanford Radiology LPCH
Current Solution
INVASIVE
LIMITS
ACCESS
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Stanford Radiology LPCH
![Page 5: Fast Pediatric MRI - Par Labparlab.eecs.berkeley.edu/sites/all/parlab/files/Fast Pediatric MRI.pdf · Fast Pediatric MRI Shreyas Vasanawala, MD/PhD Stanford University Lucile Packard](https://reader036.vdocuments.us/reader036/viewer/2022070803/5f0319657e708231d40787bd/html5/thumbnails/5.jpg)
Stanford Radiology LPCH
Why is MRI lengthy?
• Complex protocols with multiple sets of
images in multiple planes
• Encoding spatial information takes time
![Page 6: Fast Pediatric MRI - Par Labparlab.eecs.berkeley.edu/sites/all/parlab/files/Fast Pediatric MRI.pdf · Fast Pediatric MRI Shreyas Vasanawala, MD/PhD Stanford University Lucile Packard](https://reader036.vdocuments.us/reader036/viewer/2022070803/5f0319657e708231d40787bd/html5/thumbnails/6.jpg)
Stanford Radiology LPCH
MRI Sampling Concept
Fourier
transform
Fourier (k)-space Image space
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Stanford Radiology LPCH
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Stanford Radiology LPCH
Ringl et. al.,
Radiology
Nov. 2007
8:1 compression ratio
visually indistinguishable
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Stanford Radiology LPCH
Opportunity: Images are compressible.
Why spend time trying to collect information that is not there?
Compressed Sensing
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Stanford Radiology LPCH
Concept
Fourier
transform
k-space Image space
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Stanford Radiology LPCH
Teleradiology approach: First collect, then compress
Compression
101000110100 1101011 Compression
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Stanford Radiology LPCH
Compressed Sensing
Instead: Sample less, then reconstruct.
Donoho
IEEE TIF ‘06
Candes et al.
IEEE TIF ’06
101000110100 1101011 Compression
Courtesy M. Lustig
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Stanford Radiology LPCH
No CS CS
Miki
Lustig
2 fold
speedup, i.e.
15 second
breath-hold vs
usual 30 seconds
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Stanford Radiology LPCH
Barrier to clinical use
Image reconstruction time
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Stanford Radiology LPCH
Use enabled by Fast Image
Reconstruction ( < 1 minute)
Mark Murphy Kurt Keutzer
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Stanford Radiology LPCH
No CS CS
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Stanford Radiology LPCH
5 year old male No CS CS
7.2 x
speed
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Stanford Radiology LPCH
Since
Last
Year:
Free-
breathing
MRI
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Stanford Radiology LPCH
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Stanford Radiology LPCH
Resolve cardiac motion
Joseph
Cheng
Michael
Lustig
Tao
Zhang
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Stanford Radiology LPCH
Exam goals:
Heart anatomy
Heart Chamber volumes
Chamber wall motion
Quantification of blood flow
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Stanford Radiology LPCH
Single 4D scan
Real-time stereoscopic
rendering/navigation of data
8 minute scan gives
same information as
conventional 90 minute
scan
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Stanford Radiology LPCH
L1-SPIRIT ARC/GRAPPA
MP
R
Vo
lum
e-r
en
deri
ng
> 1 day reconstruction time
reduced to under 20 minutes as a
result of ParLab innovation
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Stanford Radiology LPCH
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Stanford Radiology LPCH
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Stanford Radiology LPCH
Could go even faster
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Stanford Radiology LPCH
Thank you Par Lab
Briefer, lighter, safer anesthesia
for pediatric MRI