Elastic phantoms generated by microfluidics technology: Validation of an imaged-based approach for accurate measurement of the growth rate of lung nodules

Ayman El-Baz, Palaniappan Sethu, Georgy Gimel'farb, Fahmi Khalifa, Ahmed Elnakib, Robert Falk, Mohamed Abo El-Ghar

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


This paper focuses on validating our approach for monitoring the development of lung nodules detected in successive chest low-dose computed tomography (LDCT) scans of a patient. Our methodology for monitoring detected lung nodules includes 3D LDCT data registration, which is a non-rigid technique and involves two steps: (i) global target-to-prototype alignment of one scan to another using the experience gained from a prior appearance model, followed by (ii) local alignment to correct for intricate relative deformations. We propose a new approach for validating the accuracy of our algorithm for elastic lung phantoms constructed with state-of-the-art microfluidics technology and in vivo data. Fabricated from a flexible transparent polymer, i.e. polydimethylsiloxane (PDMS), the phantoms mimic the contractions and expansions of the lung and nodules as seen during normal breathing. The in vivo data in our study had been collected from a small control group of four subjects and a larger test group of 27 subjects with known ground truth (biopsy diagnosis. The growth rate and diagnostic results for both phantoms and in vivo data confirm the high accuracy of our algorithm.

Original languageEnglish (US)
Pages (from-to)195-203
Number of pages9
JournalBiotechnology Journal
Issue number2
StatePublished - Feb 2011

All Science Journal Classification (ASJC) codes

  • Applied Microbiology and Biotechnology
  • Molecular Medicine

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