Construction of a copper stepwedge with aluminum equivalent mean gray values
J. appl. oral sci
; J. appl. oral sci;18(4): 390-396, July-Aug. 2010. ilus, graf, tab
Article
de En
| LILACS
| ID: lil-557110
Bibliothèque responsable:
BR1.1
ABSTRACT
OBJECTIVES:
To produce a copper (Cu) stepwedge with aluminum (Al) equivalent mean gray values (MGV). MATERIAL ANDMETHODS:
The thicknesses of Cu steps that were equivalent to those of the Al were formulated using the X-ray attenuation properties of the materials. The Al and fabricated Cu stepwedges were radiographed, but the MGVs of the Cu stepwedge were mismatching to those of the Al. Using a mathematical function to adjust the pixel MGV of Cu stepwedge to those of the Al, new Cu stepwedges were created. In vitro iterations were performed until best approximation to Al was reached.RESULTS:
The MGV of the Cu stepwedges fabricated by formularization were different than those of Al (p=0.001). Iteration method led to MGV similar to those of the Al stepwedge (p=0.207).CONCLUSIONS:
Construction of a Cu stepwedge according to the basic rules of radiophysic failed to result in a stepwedge with similar radiodensity values to those of Al stepwedge. Further studies may use the formularization method only for prototype Cu wedge production, but consecutive iterations shall be compassed to obtain the best approximation to Al MGV.Mots clés
Texte intégral:
1
Indice:
LILACS
Sujet Principal:
Radiographie panoramique
/
Absorptiométrie photonique
/
Cuivre
/
Aluminium
Limites du sujet:
Humans
langue:
En
Texte intégral:
J. appl. oral sci
Thème du journal:
ODONTOLOGIA
Année:
2010
Type:
Article