Comparison of x-radiation doses between conventional and rare earth panoramic radiographic techniques

Radiation dose-reduction techniques in North American dental schools

“…15,16,19,20 Whereas differences in perceptibility, contrast, and spatial resolution have been documented between the calcium tungstate and rare-earth systems, 16,17,19 investigators have found no significant differences in qualitative evaluation of these images. In total, 71.9 percent of respondents use them.…”

“…In total, 71.9 percent of respondents use them. 20 The importance of these findings to dental education lies in the fact that students, as the next generation of dental professionals, must receive accurate information on advances in radiation dose reduction. 15,16,19,20 Whereas differences in perceptibility, contrast, and spatial resolution have been documented between the calcium tungstate and rare-earth systems, 16,17,19 investigators have found no significant differences in qualitative evaluation of these images.…”

“…Rectangular collimation of the x-ray beam decreases the amount of tissue exposed, thereby lowering the absorbed dose to the patient. 1,[15][16][17][18][19][20] Despite this evidence, surveys of practicing dentists have shown fairly little acceptance of some of these dose-reducing practices. 2,13,14 Similarly, extraoral radiographic doses have been markedly reduced with the use of rare-earth intensifying screens and compatible films, compared to calcium tungstate screen-film combinations.…”

“…2,13,14 Similarly, extraoral radiographic doses have been markedly reduced with the use of rare-earth intensifying screens and compatible films, compared to calcium tungstate screen-film combinations. 1,[15][16][17][18][19][20] Despite this evidence, surveys of practicing dentists have shown fairly little acceptance of some of these dose-reducing practices. [21][22][23][24][25][26][27] Many dental schools in the United States and Canada have used these techniques for years, so dentists who hold fullor part-time faculty appointments in schools of dentistry may be familiar with the advantages of using fast film, rectangular beam limitation, long PIDs, and rare-earth screen-film systems.…”

Charge-coupled device panoramic radiography: effect of beam energy on radiation exposure.

“…24,25 Skoczylas et al 25 showed that dose to critical organs StenstroÈ m et al 13 calculated the energy imparted in the parotid region was approximately 25% lower with a constant potential machine (kVcp) compared with a self-recti®ed (kVp) unit. Hayakawa et al 26 showed that dose reductions can be achieved by increasing the beam energy to 80 kVcp and above due to improvement in the sensitivity of the rare earth screens.…”