The cadmium telluride photon counting sensor in panoramic radiology: gray value separation and its potential application for bone density evaluation

Robert Langlais; Akitoshi Katsumata; Sudeshni Naidoo; Koichi Ogawa; Tatsumasa Fukui; Shinji Shimoda; Kaoru Kobayashi

doi:10.1016/j.oooo.2015.07.002

The cadmium telluride photon counting sensor in panoramic radiology: gray value separation and its potential application for bone density evaluation

Oral Surg Oral Med Oral Pathol Oral Radiol. 2015 Nov;120(5):636-43. doi: 10.1016/j.oooo.2015.07.002. Epub 2015 Jul 13.

Authors

Robert Langlais¹, Akitoshi Katsumata², Sudeshni Naidoo³, Koichi Ogawa⁴, Tatsumasa Fukui⁵, Shinji Shimoda⁶, Kaoru Kobayashi⁷

Affiliations

¹ Professor Emeritus, University of Texas Health Science Center Dental School and CEO Emeritus Enterprises, San Antonio, TX, USA.
² Professor and Chair, Department of Oral Radiology, Asahi University School of Dentistry, Gifu, Japan. Electronic address: kawamata@dent.asahi-u.ac.jp.
³ Senior Professor and Principal Specialist, University of the Western Cape, Tygerberg, South Africa.
⁴ Professor, Department of Applied Informatics, Faculty of Science and Engineering, Hosei University, Tokyo, Japan.
⁵ Assistant, Department of Oral Radiology, Asahi University School of Dentistry, Gifu, Japan.
⁶ Professor and Chair, Department of Oral Anatomy, Tsurumi University, School of Dental Medicine, Yokohama, Japan.
⁷ Professor and Chair, Department of Oral Radiology, Tsurumi University School of Dental Medicine, Yokohama, Japan.

PMID: 26324749
DOI: 10.1016/j.oooo.2015.07.002

Abstract

Objective: To investigate whether bone mineral density can be evaluated more accurately using a panoramic device with a new cadmium telluride photon-counting sensor and software than 2 panoramic devices with a conventional semiconductor sensor.

Study design: A fiduciary test object with several known levels of hydroxy apatite mineral concentration was placed in a phantom on the mandibular occlusal plane. Panoramic images were acquired by changing the position of the test object within the dental arch. The gray value, the spectrum deformation index (SDI), and the relative attenuation index (RAI) of the test object were evaluated. The SDI and RAI represent unique energy information as acquired by the QR-Master panoramic machine and the corresponding special QR-MC analysis software. In order to compare the values expressed in the different units (gray, SDI, and RAI values), the percentage discrepancy was calculated.

Results: The cadmium telluride photon-counting fitted machine more consistently separated each of the hydroxy apatite concentrations in all of the different positioning configurations and locations. The SDI function of the QR Master machine produced more stable values than the RAI value and the gray values of the 2 conventional panoramic machines.

Conclusions: The methodologies as developed for this study can be used to test more sophisticated analyses for the determination of bone density.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Bone Density*
Cadmium Compounds*
Durapatite
Fiducial Markers
Humans
Phantoms, Imaging
Photons
Quantum Dots
Radiographic Image Interpretation, Computer-Assisted
Radiography, Panoramic / instrumentation*
Software
Tellurium*

Substances

Cadmium Compounds
Durapatite
Tellurium
cadmium telluride