title: Physical properties and ease of operation of a wireless intraoral x-ray sensor.
abstract: OBJECTIVE
  A wireless CMOS (CDR Wireless) system was evaluated based on its physical properties and ease of operation.
  
  
  METHODS
  The physical properties were assessed by dose-response curve, modulation transfer function, and detective quantum efficiency tests. The range of signal receptivity between the sensor and the antenna was also determined. The time required to make a radiograph was measured. Using a visual analog scale (VAS), 10 test patients were asked to evaluate the discomfort caused by having the sensor inserted and placed in the mouth. An intraoral x-ray film packet and a wired CDR sensor were also evaluated for comparison with the wireless system.
  
  
  RESULTS
  The physical properties of the wireless system and the wired CDR sensor were essentially equal. The antenna could receive the signal up to 3.5 m from the sensor. The wireless CMOS system required less time to perform the radiographic task than the other methods studied. The VAS scores for the wireless and wired CDR sensors were comparable.
  
  
  CONCLUSIONS
  The CDR Wireless sensor has equivalent physical properties to its wired counterpart and may be more convenient to use.
authors.affiliation: Department of Radiology, Showa University School of Dentistry, Tokyo, Japan. rtsuchi@senzoku.showa-u.ac.jp
authors.forename: Ryoko
authors.initials: R
authors.lastname: Tsuchida
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Araki
authors.forename: Atsushi
authors.initials: A
authors.lastname: Endo
authors.forename: Itsuo
authors.initials: I
authors.lastname: Funahashi
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Okano
mesh_terms: D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D017060:Patient Satisfaction; D011829:Radiation Dosage; D011845:Radio; D011857:Radiographic Image Interpretation, Computer-Assisted; D019252:Radiography, Dental, Digital / Q000295:instrumentation*; D012666:Semiconductors; D018709:Statistics, Nonparametric; D013679:Technology, Radiologic / Q000295:instrumentation