Xray Examination of the Nasal Bone

Wednesday, March 11, 2015

Nasal Bones Anatomy



Nasal Anatomy

The nasal bones is part of the facial bone. In different individuals the nasal bones varies it's size and shape. Nasal bones has two tiny bones and form the superior bony wall of the nasal cavity called the bridge of the nose. The nasal bones articulate in the midsagital plane, where at their posterior surface they also articulate with the perpendicular plate of the ethmoid bone. They articulate through the frontal above and with the maxillae at the sides.




Nasal Bone : Radiographic Positions

Performing this projection properly radiographer must:
  • Let patient hold the occlusal film packet between the its teeth or when using large image receptor place it under the chin so that the plane of IR is perpendicular to the glabeloalveolar line.
  • The central ray is perpendicular to the plane of image receptor and glabelloalveolar line.

    Structure Shown:
    • Tangential projection of only a portion nasal bone that extend the glabelloalveolar line is shown.
    • It is primarily used to demonstrate the medial and lateral displacement of fragments in fractured.

    Technical Factors:
    • 8 x 10 inches, Crosswise or 2 ¼ x 3 inches occlusal film.
    • Occlusal film is recommended because of the reduced object-to-image receptor distance (OID)
    • kVp 50
    • mAs 3
    • SID 40 inches

    Patient Position:
    • Patient is either a recumbent or seated position
    • Patient is seated so that the chin can be supported on a sandbag or an inclined image receptor.

    Central Ray:
    • CR is parallel with glabelloalveolar line and perpendicular to the plane of the IR.

    Respiration:
    • Suspended
    Part Position Using Extraoral Image Receptor:
    • The IR is elevated adjacent to the patient on a small sandbag or in folded towel.
    • The chin is extended, and IR is centered to midsagittal plane just anterior to the chin.
    • Plane of IR is perperdicular to the glabeloalveolar line by adjusting the inclination of the film.
    • Midsagittal plane is perpendicular to the plane of IR by adjusting the patients head.
    • Put and tape the marker R or L onto one side of the pebbled surface of the film packet.
    • Patient is in supine position, rest head or elevate it on a sponge.
    • Make middagittal plane of the head vertical and glabelloalveolar line is horizontal by adjusting head
    • Immobilize head
    • Long axis is directed anteroposteriorly and the pebbled surface facing upward, the film packet is inserted approximately 1inch into the mouth.
    • Packet film is centered to midsagittal plane, close patient lips and teeth so that the film is held in position with the glabeloalveolar line.
    • Tangential projection of only a portion nasal bone that extend the glabelloalveolar line is shown.
    • It is primarily used to demonstrate the medial and lateral displacement of fragments in fractured.
    • The following should be clearly demonstrated:
    • Nasal bones with less obscurity to the forehead, recessed nose, or protruding upper teeth.
    • No rotation of the nose.
    • Soft tissues and trabecular markings are shown.
    Note: This projection cannot successfully performed in children or in adults who have very short nasal bones, a concave face or protruding upper teeth because bones in the nose donot have enough body to cast a shadow through the dense superadjacent and subadjacent structures.

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