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Rex Couture

Rex Couture

Research Associate

Office: E&PS Building 133
Tel: (314)935-4194
Fax: (314)362-6971



B.S., Chemistry, California Institute of Technology, Pasadena - 1966
Ph.D., Geology & Geochemistry, University of California, San Diego - 1977


Rex Couture's scientific career began with a post-doctoral appoinment at Argonne National Laboratory in 1977, where he became a Staff Scientist in the Chemical Technology Division in 1979. In 1985, he was self-employed as a microscope instrument designer in Woodridge, IL. Rex came to Washington University's Earth and Planetary Sciences Department in 1986, where is currently a staff scientist X-Ray Specialist. He has lent his skills to the Radiology Department since 2000.

Research Interests

X-Ray Spectrometry


  1. Couture, R.A. (1989) An improved fusion technique for major-element analysis by XRF. Advances in X-Ray Analysis, 32, 233-238.
  2. Couture, Rex A., Smith, Michael S., and Dymek, Robert F. (1993) X-ray fluorescence analysis of silicate rocks using fused glass discs and a side-window Rh source tube: accuracy, precision and reproducibility.  Chemical Geology 110, 315-328.
  3. Couture, Rex A. (1993) Sample transparency effects in tin determination by x-ray fluorescence.  X‑Ray Spectrometry 22, 92-96.
  4. Couture, R. A. and Dymek, R.F. (1996) A reexamination of absorption and enhancement effects in X-ray fluorescence trace element analysis.  American Mineralogist 81, 639-650.
  5. Couture, Rex A. and Hildebolt, Charles (2000) Quantitative dental radiography with a New Photostimulable Phosphor System.  Oral Surg Oral Med Oral Pathol Oral Radiol Endod 89, 498-508.
  6. Hildebolt, C.F., Couture, R.A. and Whiting, B.R. (2000) Dental photostimulable phosphor radiography.  Dental Clinics of North America 44:  273-297 (invited contribution).
  7. Couture, R.A., (2000) Intelligent interpolation for background subtraction in trace-element analysis (abstract).  Denver X-ray Conference, July 31 – Aug. 4, 2000, Denver.
  8. Couture, Rex (2001) Intelligent Interpolation for background subtraction – a hybrid approach for trace-element analysis.  Advances in X-Ray Analysis, vol. 44:  355-360.
  9. Couture, R.A., Hildebolt, C.F. and Whiting, B.R. (2001)  Photostimulable phosphor scanners for oral bone mass measurements.  J. Dental Res. 80:  93 (abstract).
  10. Couture, Rex (2001) Background subtraction for trace-element analysis – Analytical comparison of methods.  Abstract, Denver X-ray Conference, Steamboat Springs, August, 2001 -  http://www.dxcicdd.com/01/pdf/F-51.pdf.Couture, R. (2002) Background subtraction for trace-element analysis – analytical comparison of methods.  Advances in X-ray Analysis, 45:  441-446.
  11. Couture RA, Hildebolt CF(2002)  Precise image – receptor calibration and monitoring of beam quality with a step wedge.  Dentomaxillofacial Radiology, 31, pp. 56-62.
  12. Couture, R. (2003) Comments on noise and resolution of the DenOptix radiography system.  Oral Surgery, Oral Medicine, Oral Pathology, Oral and Maxillofacial Radiology, 95: 746-751.
  13. Couture, R.A., Whiting, B., Hildebolt, C.F., and Dixon, D.A. (2003) Visibility of trabecular structures in oral radiographs.  Oral Surgery, Oral Medicine, Oral Pathology, Oral and Maxillofacial Radiology, 96, 764-771.
  14. Couture, R., Dixon, D., Hildebolt, C., and Whiting, B. (2004) A new film-positioning device based on cross-arch stabilization.  J. Dental Res., 83, Special Issue C, #1947 (abstract).
  15. Couture, R., Whiting, B., Hildebolt, C., and Dixon, D.  (2004) Intensity-ratio X-ray absorptiometry:  control for variable cheek thickness.  J. Dental Res., 83, Special Issue C, #3983 (abstract).