Physical properties of a system for direct acquisition of digital intraoral radiographs

Gang Li, Kazunori Yoshiura, Xie Qi Shi, Ulf Welander, William D. McDavid

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Objective: To determine technical properties for a direct digital intraoral radiographic system, F1 iOX (Fimet Oy, Monninkylä, Finland). Methods: A dose response function was calculated from seven radiographs exposed to a homogenous radiation field. The line spread function (LSF) and the modulation transfer function (MTF) were determined from a radiograph of a test object having a slit. Noise power spectra (NPSs) were determined at three exposures from radiographs exposed to a homogeneous radiation field. Noise equivalent quanta (NEQs) were calculated from NPSs and the MTF. Detective quantum efficiencies (DQEs) were determined from the NEQs and a representative value of the photon fluence. Signal-to-noise ratios (SNRs) were calculated from the NEQs and different signal contrasts. Results: The dose response function was linear and the system relatively sensitive. The maximum NPS was less than 10-5 mm2. NEQs indicate that the system captures a relatively high number of photons. At peaks of about 1 cycle/mm DQEs reached almost 35%. SNRs are relatively high. Conclusion: The technical properties found in this study indicate that the F1 iOX system is suitable for intraoral dental radiography.

Original languageEnglish
Pages (from-to)22-27
Number of pages6
JournalOral Radiology
Issue number1
Publication statusPublished - Jun 2003

All Science Journal Classification (ASJC) codes

  • Dentistry (miscellaneous)
  • Radiology Nuclear Medicine and imaging


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