Fast Three-Point Dixon MR Imaging Using Low-Resolution Images for Phase Correction
A Comparison with Chemical Shift Selective Fat Suppression for Pediatric Musculoskeletal Imaging
Frank J. Rybicki1,2,
Taylor Chung3,
Janet Reid4,
Diego Jaramillo5,
Robert V. Mulkern1 and
Jingfei Ma6
1
Department of Radiology, Children's Hospital and Harvard Medical School, 330
Longwood Ave., Boston, MA 02115.
2
Department of Radiology, Brigham and Women's Hospital and Harvard Medical
School, 75 Francis St., Boston, MA 02115.
3
Edward B. Singleton Department of Diagnostic Imaging, Texas Children's
Hospital and Baylor College of Medicine, 6621 Fannin St., Houston, TX
77030.
4
Department of Radiology, Children's Hospital, The Cleveland Clinic Foundation,
9500 Euclid Ave., Cleveland, OH 44195.
5
Department of Radiology, Massachusetts General Hospital and Harvard Medical
School, 55 Fruit St., Boston, MA 02114.
6
Department of Radiology, The University of Texas M. D. Anderson Cancer Center,
1515 Holcombe Blvd., Houston TX 77030.
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Fig. 1A. —Images of corn-oil-and-water phantom acquired with
three-point Dixon and chemical shift selective (CHESS) suppression of fat.
CHESS fat suppression of corn oil in central vial shows inhomogeneity at top
of vial at its interface with air (arrow).
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Fig. 1B. —Images of corn-oil-and-water phantom acquired with
three-point Dixon and chemical shift selective (CHESS) suppression of fat.
Three-point Dixon pure-water image illustrates more homogeneous suppression of
corn oil in central vial.
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Fig. 2A. —MR examination of both feet in 2.5-year-old girl with 6-month
history of limp favoring left foot. Feet are positioned together in quadrature
head coil. Three-point Dixon pure-water images shows excellent conspicuity of
marrow edema of left first metatarsal bone (arrow).
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Fig. 2B. —MR examination of both feet in 2.5-year-old girl with 6-month
history of limp favoring left foot. Feet are positioned together in quadrature
head coil. Chemical shift selective image corresponding to A does not
reveal finding caused by inhomogeneous fat suppression.
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Fig. 3A. —4-year-old girl with multiple venous malformations.
Examination of knee is performed using extremity coil. Chemical shift
selective image raises possibility of venous malformation in subcutaneous
tissues (arrow) over patella.
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Fig. 3B. —4-year-old girl with multiple venous malformations.
Examination of knee is performed using extremity coil. Three-point Dixon
pure-water image unequivocally excludes abnormality in this region.
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Fig. 4A. —Follow-up MR imaging in 8-month-old girl after chemotherapy
for rhabdomyosarcoma of right leg. Quadrature head coil is used. Three-point
Dixon pure-water image shows nearly complete replacement of fat in marrow
space with longer T1 substance, likely edema, red-marrow, or both.
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Fig. 4B. —Follow-up MR imaging in 8-month-old girl after chemotherapy
for rhabdomyosarcoma of right leg. Quadrature head coil is used. Three-point
Dixon pure-fat image shows minimal, if any, fat in marrow space.
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Fig. 4C. —Follow-up MR imaging in 8-month-old girl after chemotherapy
for rhabdomyosarcoma of right leg. Quadrature head coil is used. Chemical
shift selective image offers less robust characterization of tissue chemical
composition.
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Copyright © 2001 by the American Roentgen Ray Society.
