Cross-imaging platform comparison of ultrasonic backscatter coefficient measurements of live rat tumors

Lauren A. Wirtzfeld, Goutam Ghoshal, Zachary T. Hafez, Kibo Nam, Yassin Labyed, Janelle J. Anderson, Maria Teresa Herd, Alexander Haak, Zhi He, Rita J. Miller, Sandhya Sarwate, Douglas G. Simpson, James A. Zagzebski, Timothy A. Bigelow, Michael L. Oelze, Timothy J. Hall, William D. O'Brien

Research output: Contribution to journalArticle

Abstract

Objective: To translate quantitative ultrasound (QUS) from the laboratory into the clinic, it is necessary to demonstrate that the measurements are platform independent. Because the backscatter coefficient (BSC) is the fundamental estimate from which additional QUS estimates are calculated, agreement between BSC results using different systems must be demonstrated. This study was an intercomparison of BSCs from in vivo spontaneous rat mammary tumors acquired by different groups using 3 clinical array systems and a single-element laboratory scanner system. Methods: Radio frequency data spanning the 1- to 14-MHz frequency range were acquired in 3 dimensions from all animals using each system. Each group processed their radio frequency data independently, and the resulting BSCs were compared. The rat tumors were diagnosed as either carcinoma or fibroadenoma. Results: Carcinoma BSC results exhibited small variations between the multiple slices acquired with each transducer, with similar slopes of BSC versus frequency for all systems. Somewhat larger variations were observed in fibroadenomas, although BSC variations between slices of the same tumor were of comparable magnitude to variations between transducers and systems. The root mean squared (RMS) errors between different transducers and imaging platforms were highly variable. The lowest RMS errors were observed for the fibroadenomas between 4 and 5 MHz, with an average RMS error of 4 × 10-5 cm-1Sr-1 and an average BSC value of 7.1 × 10-4 cm-1Sr-1, or approximately 5% error. The highest errors were observed for the carcinoma between 7 and 8 MHz, with an RMS error of 1.1 × 10-1 cm-1Sr-1 and an average BSC value of 3.5 ×10-2 cm-1Sr-1, or approximately 300% error. Conclusions: This technical advance shows the potential for QUS technology to function with different imaging platforms.

Original languageEnglish (US)
Pages (from-to)1117-1123
Number of pages7
JournalJournal of Ultrasound in Medicine
Volume29
Issue number7
DOIs
StatePublished - Jul 1 2010

Keywords

  • Backscatter coefficient
  • Quantitative ultrasound
  • Spontaneous mammary tumors

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Medicine(all)

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    Wirtzfeld, L. A., Ghoshal, G., Hafez, Z. T., Nam, K., Labyed, Y., Anderson, J. J., Herd, M. T., Haak, A., He, Z., Miller, R. J., Sarwate, S., Simpson, D. G., Zagzebski, J. A., Bigelow, T. A., Oelze, M. L., Hall, T. J., & O'Brien, W. D. (2010). Cross-imaging platform comparison of ultrasonic backscatter coefficient measurements of live rat tumors. Journal of Ultrasound in Medicine, 29(7), 1117-1123. https://doi.org/10.7863/jum.2010.29.7.1117