Abstract #4162
Four-fold reduction in scan time for skeletal age examination enabled by adaptive compressed sensing MRI
Yasuhiko Terada 1 , Keiichiro Ishi 1 , Daiki Tamada 1 , Katsumi Kose 1 , Taiki Nozaki 2 , Yasuhito Kaneko 2 , Ryo Miyagi 2 , and Hiroshi Yoshioka 2
1
Institue of Applied Physics, University of
Tsukuba, Tsukuba, Ibaraki, Japan,
2
Department
of Radiological Sciences, University of California
Irvine, Irvine, CA, United States
Skeletal age of a young child is assessed by rating the
maturity stage of left-hand bones in the MRI images. We
have used a 0.3 T open scanner to provide a comfortable
examination environment for children, and showed the
validity of the skeletal age examination. However, the
long scan times for 3D imaging are uncomfortable for
children and often induce motion artifacts in the
images. In the previous study, we used compressed
sensing (CS) to shorten the long scan time, but the
acceleration factor (AF) was limited to 2 because of the
low signal-to-noise ratio. To further decrease the scan
time, it is necessary to optimize the CS sampling
pattern for skeletal age examination with knowledge of
the nature of data to be reconstructed. In this study,
we optimize the sampling pattern using the database of
hand images obtained in the previous study and realize
the 40-second scan (AF = 4). Both the simulation and
experimental results reveal the validity of the CS-based
skeletal examination using optimal sampling.
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