Sinus Self Test Questions

Paranasal sinuses

Which structures should always be radiographed with the patient in an upright position?

Lateral

Which of the following is the only projection for paranasal sinuses and adequately demonstrates all four sinus groups?

Posterior

With reference to the outer canthus, where should the central ray be directed for the lateral projection of the sinus?

Sphenoidal

Which sinus group is of primary importance in the lateral projection of the sinuses?

Frontal and anterior ethmoidal

Which sinus groups are best demonstrated with the PA axial projection, Caldwell method?

OML perpendicular and raise the head 15 degrees

For the PA axial projection, caldwell method, of the sinuses, the proper positioning method is?

Lower one third of the orbits

Where should the petrous ridges be seen in the image of the Pa axial projection, caldwell method, of the sinuses

Orbitomeatal

Which positioning line should form angle of 37 degrees with the IR for the parietoacanthial projection, waters method?

perpendicular

With reference to the IR, how should the central ray be directed for the parietoacanthial projection, waters method for sinsuses?

Maxillary

Which paranasal sinus group is best demonstrated with the waters method?

Below the maxillary sinuses

Where should the petrous ridges be seen in the image of the waters method of the paranasal sinsues?

Acanthion

Where should the central ray exit the head for the waters method?

Sphenoidal

Which sinus group is not well demonstrated in the image produced by the waters method?

Ethmoidal and sphenoidal

Which two paranasal sinus groups are better demonstrated with the SMV projection than any of the other sinuses?

Submentovertical

Which projection of the sinuses demonstrates a symmetric image of the anterior portion of the base of the skull?

PA axial, Caldwell

In which projection of the sinuses is the IR centered to the nasion?

Waters

In which projection of the sinuses is the mentomeatal line approx. perpendicular to the plane of the IR?

Caldwell

In which projection of the sinuses must the OML form an angle of 15 degrees with the plane of the IR?

All four sinus groups should be included

Which evaluation criterion pertains to the lateral projection of the paranasal sinuses?

The orbital roofs should be superimposed

Which evaluation criterion pertains to the lateral projection of the paranasal sinuses?

The frontal and ethmoidal sinuses should be seen

Which evaluation criterion pertains to the PA axial projection, Caldwell, of the sinuses?

petrous ridges should lie in the lower one third of the orbits

Which evaluation criterion pertains to PA axial, caldwell method, for sinuses?

Petrous ridges should lie immediately below the floor of the maxillary sinuses

Which evaluation criterion pertains to the waters method for sinuses?

Mental protuberance should superimpose anterior frontal bone

Which evaluation criterion pertains to the SMV projection for paranasal sinuses?

Mandibular condyles should be anterior to the petrous ridges

Which evaluation criterion pertains to the SMV projection for sinuses?