title: A clinical trial of the Nomad portable X-ray unit.
abstract: OBJECTIVE
  To compare image quality of intraoral radiographs made with the Nomad portable X-ray unit (Aribex, Inc.) and with a wall-mounted dental X-ray machine in a clinical setting.
  
  
  METHODS
  Twelve patients requiring a full-mouth radiographic series for diagnostic purposes were recruited for the study, in which half of the radiographs (one side selected randomly) were made with the Nomad and half with a wall-mounted dental X-ray machine. Each individual image was evaluated independently by three reviewers for diagnostic utility and quality, using a three-point scale: 2 = perfect radiograph; 1 = acceptable for diagnostic purposes despite a small error; 0 = unacceptable. A total score was derived for each of the 220 images, each of the 12 patients, and the study population as a whole.
  
  
  RESULTS
  The combined quality scores of the three reviewers for each set of radiographs ranged from 22-60 for the Nomad and 21-55 for the control units. Median scores were 33 for the Nomad and 33.5 for the control. The maximum possible score was nine films/half mouth x two points for perfect film x three reviewers = 54 (maximum 66 for 11 films). Three of the films, all on the same patient in a wheelchair, showed motion artifact (two with Nomad, one with control).
  
  
  CONCLUSIONS
  Image quality for radiographs taken with the Nomad and a wall-mounted X-ray machine appears to be similar in a variety of clinical situations. Motion artifact is not a significant issue with the Nomad.
authors.affiliation: Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, USA.
authors.forename: Sharon L
authors.initials: SL
authors.lastname: Brooks
authors.forename: Wallin E
authors.initials: WE
authors.lastname: McMinn
authors.forename: Eriha
authors.initials: E
authors.lastname: Benavides
mesh_terms: D000328:Adult; D016477:Artifacts; D004867:Equipment Design; D006801:Humans; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011834:Radiation Monitoring; D011835:Radiation Protection; D011856:Radiographic Image Enhancement; D016300:Radiography, Bitewing / Q000295:instrumentation; D011861:Radiography, Dental / Q000295:instrumentation*; D016037:Single-Blind Method; D013997:Time Factors