When the patient is lying supine How should the chin be manipulated in order to place the lips meatal line perpendicular to the IR?

What should occur when a parietoacanthial projection (Waters method) is performed for facial bones?

1.
Midsagittal plane is parallel to the IR, the head rests on the chin, and the orbitomeatal line forms a 37-degree angle to the IR.

2.
Midsagittal plane is perpendicular to the IR, the head rests on the chin, and the orbitomeatal line forms a 37-degree angle to the IR.

3.
Midsagittal plane is perpendicular to the IR, the head rests on the chin, and the orbitomeatal line forms a 53-degree angle to the IR.

4.
Midsagittal plane is perpendicular to the IR, the head rests on the nose, and the orbitomeatal line forms a 37-degree angle to the IR.

What cranial positioning line should be perpendicular to the image receptor IR when positioning the patient for a lateral view of the facial bones?

Why should a horizontal beam be directed perpendicular to the image receptor when positioning a patient for a lateral trauma skull?

What is the frequently used cranial positioning line that is located between the outer Canthus and external acoustic meatus?

What can the radiologic technologist do to help the patient maintain a true lateral position of the skull while recumbent?