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Diffusion‐weighted PROPELLER MRI for quantitative assessment of liver tumor necrotic fraction and viable tumor volume in VX2 rabbits
Author(s) -
Deng Jie,
Virmani Sumeet,
Young Joseph,
Harris Kathleen,
Yang GuangYu,
Rademaker Alfred,
Woloschak Gayle,
Omary Reed A.,
Larson Andrew C.
Publication year - 2008
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.21327
Subject(s) - concordance correlation coefficient , propeller , nuclear medicine , magnetic resonance imaging , diffusion mri , liver tumor , biomedical engineering , medicine , materials science , radiology , mathematics , statistics , marine engineering , engineering , hepatocellular carcinoma
Purpose To test the hypothesis that diffusion‐weighted (DW)‐PROPELLER (periodically rotated overlapping parallel lines with enhanced reconstruction) MRI provides more accurate liver tumor necrotic fraction (NF) and viable tumor volume (VTV) measurements than conventional DW‐SE‐EPI (spin echo echo‐planar imaging) methods. Materials and Methods Our institutional Animal Care and Use Committee approved all experiments. In six rabbits implanted with 10 VX2 liver tumors, DW‐PROPELLER and DW‐SE‐EPI scans were performed at contiguous axial slice positions covering each tumor volume. Apparent diffusion coefficient maps of each tumor were used to generate spatially resolved tumor viability maps for NF and VTV measurements. We compared NF, whole tumor volume (WTV), and VTV measurements to corresponding reference standard histological measurements based on correlation and concordance coefficients and the Bland–Altman analysis. Results DW‐PROPELLER generally improved image quality with less distortion compared to DW‐SE‐EPI. DW‐PROPELLER NF, WTV, and VTV measurements were strongly correlated and satisfactorily concordant with histological measurements. DW‐SE‐EPI NF measurements were weakly correlated and poorly concordant with histological measurements. Bland–Altman analysis demonstrated that DW‐PROPELLER WTV and VTV measurements were less biased from histological measurements than the corresponding DW‐SE‐EPI measurements. Conclusion DW‐PROPELLER MRI can provide spatially resolved liver tumor viability maps for accurate NF and VTV measurements, superior to DW‐SE‐EPI approaches. DW‐PROPELLER measurements may serve as a noninvasive surrogate for pathology, offering the potential for more accurate assessments of therapy response than conventional anatomic size measurements. J. Magn. Reson. Imaging 2008. © 2008 Wiley‐Liss, Inc.