RADIOGRAPHY OF PARANASAL SINUSES

Dr. Rasul

VERTICOSUBMENTAL PROJECTION; SCHULLER METHOD

• Film:-8 × 10 inch• Patient position:-Seated erect

position• Part position:-Extension of the head

over a horizontally placed cassette, elevate the side of the cassette adjacent to the patient on a sponge or small sandbag, adjust the head so the midsagittal plane is perpendicular to the plane of the film

• Central ray:-Perpendicular to the infraorbitomeatal line at the intersection of midsaggital plane and coronal plane

Evaluation criteria

• Sphenoid sinuses should be clearly demonstrated with the posterior ethmoids visualised just below the mentum of the mandible

• Distance from the lateral border of the skull to the mandibular condyles should be equal on both sides

• Mandible should be symmetric on both sides.

AXIAL TRANSOLAR PROJECTION; PIRIE METHOD

• Film:-8 × 10 inch• Patient position:-Seated before a

vertical grid device• Part position:-Place the cassette in

the vertical holder and adjust it to the correct height, rest the patient head firmly on the nose and chin, with the mouth wide open and centered on the film

• Adjust the head so that the midsagittal plane is perpendicular to the plane of the film

• Central ray:-Direct the central ray to midsagittal plane along a line extending from the sellaturcica to the center of the open mouth

Evaluation criteria

• Sphenoid sinuses should be demonstrated through the open mouth without overlap from the upper dental arch

• Shadows of the tongue should not superimpose the sphenoid sinuses

• Distance from the outer border of the skull to the molars should be equal on both sides

PA OBLIQUE PROJECTION; RHESE METHOD

• Film:-8 × 10 inch• Patient position:- Seated erect

position

• Part position:-With the orbit centered to the cassette, rest the patient head on the zygoma, nose and chin. Adjust the flexion of the head so that the acanthomeatal line is perpendicular with the transverse axis of the film. Adjust the rotation of the patient head, so that the midsagittal plane forms an angle of 53 degree from the plane of the film.

• Central ray:-Perpendicular to the mid point of the film.

Evaluation criteria

• Dependent orbit should be projected anterior to the ethmoid sinuses

• Posterior ethmoid air cells will overlap the inferior portion of the orbit

• Optic foramina should be in the same position on both sides

PA OBLIQUE PROJECTION; LAW METHOD

• Film:-8 × 10 inch• Patient position:- Seated

erect position• Part position:- Center the

region of maxillary sinus to the cassette and rest the patient head on the fully extended chin, the nose and the zygoma

• Central ray:- To the mid point of the film at an angle of 25-30 degree cephalad

Evaluation criteria

• Maxillary sinus should be demonstrated without superimposition from the opposite maxillary sinus

• Teeth should be projected below the maxillary sinus

mAs

•38

kvP

•60

FFD

100 cm

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