The effect of patient movement on resolution.
The effect of long exposure time on patient movement and resulting radiographic resolution was simulated and then measured by visual-light photographic techniques for four radiographic projections. A mathematic relation was then derived to transform these measurements to the maximum resolutions that could have been obtained with radiographs under similar conditions. The results indicate that radiographs of rigid structures such as bones and teeth can be taken with reasonable resolution at exposure times much longer than normally used in clinical practice. It was also found that radiographs taken with the film rigidly fixed to the object being studied will exhibit remarkably less blurring from patient motion than radiographs taken when the patient and the film are not coupled. In addition it was found that motion artifacts are reduced to a minimum when the plane of the film is perpendicular to the radiation beam.
Vandre
R H
RH
U.S. Army Institute of Dental Research, Walter Reed Army Medical Center, Washington, DC.
Akers
A
A
Lorton
L
L
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009068:Movement; D011861:Radiography, Dental / Q000379:methods*; D013997:Time Factors; D014962:X-Ray Film