Comparison of Voxel-Wise and Histogram Analyses of Glioma ADC Maps for Prediction of Early Therapeutic Change

Thomas L. Chenevert, Dariya I. Malyarenko, Craig J. Galbán, Diana M. Gomez-Hassan, Pia C. Sundgren, Christina I. Tsien, Brian D. Ross

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Noninvasive imaging methods are sought to objectively predict early response to therapy for high-grade glioma tumors. Quantitative metrics derived from diffusion-weighted imaging, such as apparent diffusion coefficient (ADC), have previously shown promise when used in combination with voxel-based analysis reflecting regional changes. The functional diffusion mapping (fDM) metric is hypothesized to be associated with volume of tumor exhibiting an increasing ADC owing to effective therapeutic action. In this work, the reference fDM-predicted survival (from previous study) for 3 weeks from treatment initiation (midtreatment) is compared to multiple histogram-based metrics using Kaplan-Meier estimator for 80 glioma patients stratified to responders and nonresponders based on the population median value for the given metric. The ADC histogram metric reflecting reduction in midtreatment volume of solid tumor (ADC < 1.25 × 10-3 mm2/s) by >8% population-median with respect to pretreatment is found to have the same predictive power as the reference fDM of increasing midtreatment ADC volume above 4%. This study establishes the level of correlation between fDM increase and low-ADC tumor volume shrinkage for prediction of early response to radiation therapy in patients with glioma malignancies.

Original languageEnglish
Pages (from-to)7-14
Number of pages8
JournalTomography (Ann Arbor, Mich.)
Issue number1
StatePublished - Mar 1 2019


  • apparent diffusion coefficient
  • functional diffusion map
  • glioma therapy response
  • quantitative response metric
  • voxel-wise analysis


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