Determination of the resolution of a digital system for panoramic radiography based on CCD technology

Mihalis Mastoris, Gang Li, Ulf Welander, W. D. McDavid

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Objectives. To determine Line Spread Functions (LSFs) and Modulation Transfer Functions (MTFs) for a digital system for panoramic radiography: the Dimax I (Planmeca Oy, Helsinki, Finland) based on Charge-Coupled Device (CCD) technology. Study design. A test object was specially designed having a gold foil positioned vertically. Images of the gold foil created edge functions that were used to determine LSFs and MTFs. The design of the test object made it possible to move the gold foil forward and backward relative to the central plane of the image layer by means of a micrometer screw. The experiment was carried out for different object depths in 5 different regions: the anterior, the canine, the premolar, the molar, and the TMJ regions. LSFs and MTFs were calculated using specially designed software. Results. The results are presented graphically. LSFs and MTFs for the central plane were essentially the same for all regions. The MTFs for different object depths in the 5 investigated regions exhibited typical characteristics of MTFs for panoramic radiography with the exception for the functions for the molar region. Conclusions. The present findings indicate that the resolution of the Dimax I CCD system is comparable to that of film-based panoramic radiography.

Original languageEnglish (US)
Pages (from-to)408-414
Number of pages7
JournalOral surgery, oral medicine, oral pathology, oral radiology, and endodontics
Issue number3
StatePublished - Mar 2004
Externally publishedYes

ASJC Scopus subject areas

  • Surgery
  • Oral Surgery
  • Otorhinolaryngology
  • Dentistry(all)


Dive into the research topics of 'Determination of the resolution of a digital system for panoramic radiography based on CCD technology'. Together they form a unique fingerprint.

Cite this