Test–retest performance of a 1-hour multiparametric mr image acquisition pipeline with orthotopic triple-negative breast cancer patient-derived tumor xenografts

Xia Ge, James D. Quirk, John A. Engelbach, G. Larry Bretthorst, Shunqiang Li, Kooresh I. Shoghi, Joel R. Garbow, Joseph J.H. Ackerman

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Preclinical imaging is critical in the development of translational strategies to detect diseases and monitor response to therapy. The National Cancer Institute Co-Clinical Imaging Resource Program was launched, in part, to develop best practices in preclinical imaging. In this context, the objective of this work was to develop a 1-hour, multiparametric magnetic resonance image-acquisition pipeline with triple-negative breast cancer patient-derived xenografts (PDXs). The 1-hour, image-acquisition pipeline includes T1-and T2-weighted scans, quantitative T1, T2, and apparent diffusion coefficient (ADC) parameter maps, and dynamic contrast-enhanced (DCE) time-course images. Quality-control measures used phantoms. The triple-negative breast cancer PDXs used for this study averaged 174 ± 73 μL in volume, with region of interest–averaged T1, T2, and ADC values of 1.9 ± 0.2 seconds, 62 ± 3 milliseconds, and 0.71 ± 0.06 μm2/ms (mean ± SD), respectively. Specific focus was on assessing the within-subject test–retest coefficient-of-variation (CVWS) for each of the magnetic resonance imaging metrics. Determination of PDX volume via manually drawn regions of interest is highly robust, with ~1% CVWS. Determination of T2 is also robust with a ~3% CVWS. Measurements of T1 and ADC are less robust with CVWS values in the 6%–11% range. Preliminary DCE test–retest time-course determinations, as quantified by area under the curve and Ktrans from 2-compartment exchange (extended Tofts) modeling, suggest that DCE is the least robust protocol, with ~30%– 40% CVWS.

Original languageEnglish
Pages (from-to)320-331
Number of pages12
JournalTomography (Ann Arbor, Mich.)
Volume5
Issue number3
DOIs
StatePublished - Sep 2019

Keywords

  • ADC
  • DCE
  • MRI
  • Mouse
  • Multiparametric MRI
  • PDX
  • Preclinical
  • Small animal
  • T1
  • T2
  • TNBC
  • Test–retest

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