Presentation on theme: "Basic Skull Positioning- Parts 1 and 2 6/5/2014 Skull Positioning DMI 55."— Presentation transcript:
Basic Skull Positioning- Parts 1 and 2 6/5/2014 Skull Positioning DMI 55
-form protective housing of brain (cranial vault) 14 Facial 2 types of Skull bones 8 Cranial -provides structure, shape & support for face -protective housing for upper ends of respiratory & digestive tracts - with cranial-forms eye sockets
The Cranium The Brain Of Jane Stays mainly In her Cran(ium)
A b Lateral Skull a-sphenoid b-squamous suture c-temporal d-occipital e-EAM f-mastoid process g-styloid process h-TMJ i-zygoma c d e f g h h i a a b (suture)
Landmarks Midsagittal plane Glabella Interpupillary line Inner Canthus Nasion Acanthion Mentum Outer Canthus Gonion Infraorbitlal margin a b c d e f g h i j
Generally 5 basic positions in “Skull Series” PA PA Axial (Caldwell) Lateral AP Axial (Towne) SMV (Submentovertical) All use 40” SID and 10X12 IR
Forehead and nose touch IR CR perpendicular to IR (0 deg. Angle) Exit at nasion Cassette 10x12 lengthwise O degrees
Alternate PA skull projections Decub style AP
PA Skull- Evaluation Criteria Entire Cranium included Equal distance from lateral border of skull to lateral border of orbit on both sides Symmetric petrous pyramids filling orbits ! R
At approximately what age does human skull reach full size? ___ years old?
PA Axial –Caldwell method
PA Axial-Caldwell Exactly same as PA, except CR angled 15 degrees down !
PA Axial- Caldwell Evaluation Criteria Same as PA except petrous ridges fill the lower 1/3 of orbits!
Which PA Axial projection is best? A B
Compare the difference! PA PA Axial
What is TREPANATION? Intentional drilling of holes through skull to improve mental functions open up cranial vault so brain can once again bathe directly in cosmic energy that it has been sealed off from since fontanels closed up
Lateral projection of Skull
10x12 CW CR 2” superior to EAM Midsagittal plane parallel to IR Interpupillary line perpendicular to IR (IOML parallel to long axis of IR)
Lateral Skull- Evaluation Criteria Entire cranium without tilt or rotation Superimposed orbital roofs, and EAMs, TMJs Sella Turcica in profile No overlap of C-spine by mandible
What is wrong with this lateral?
Other ways to perform Lateral Dorsal Decubitus Erect Semi- prone
What projection and what is wrong? R
AP Axial- ( Towne Method)
AP Axial- Towne method CR 30 deg. Cauduad to OML (37 deg to IOML) CR enters 2 ½” above glabella, passing through level EAM
AP Axial (Towne Method) - Evaluation Criteria No rotation (equal distance from lateral border of skull to lateral margin of foramen magnum) Symmetric petrous ridges Dorsum sellae and posterior clinoids visible in foramen
Alternate ways to perform Towne Erect Lateral Decubitus
Submentovertical projection (SMV)
SMV CR-through Sella turcica (3/4” anterior to EAM) Perpendicular to IOML IOML parallel to IR 10x12 cassette lengthwise
SMV- alternate position
SMV- Evaluation Criteria Equal distance from lateral border of skull to mandibular condyles on both sides (no tilt) Superimposition of mental protuberance over frontal bone Mandibular condyles anterior to petrous pyramids