Dalton State College Radiologic Technology Program
The total number of fontanels in an infant
Six - Anterior, Posterior, Right and left sphenoid, Right and left mastoid
The 4 Cranial bones that form the calvaria (skullcap)
Frontal, Left & Right Parietal, Occipital
The 4 Cranial bones that form the floor of the cranium
Right & Left Temporal, Sphenoid, Ethmoid
The cranial bone that articulates with all the other cranial bones
The landmark that corresponds with the level of the petrous ridge (Todd's Question, double barrel)
The cranial bone that contains the cribriform plate
The suture that separates the parietal from the occipital lobe
An average shaped skull with a 47 degree angle between the petrous pyramids & the midsagittal plane
The term that describes the small flap of cartilage covering the opening to the ear
The degree difference between the OML and IOML
7 to 8 degrees
The most critical factor for demonstrating air/fluid levels within the cranium
Situation: A radiograph of an AP axial projection of the cranium reveals that the dorsum sellae is projected below the foramen magnum but the anterior arch of C1 is visible within the foramen. Name the Error.
Insufficient flexion of the head and neck
The projections that best visualize the anterior clinoid processess of the sella turcica
AP axia, CR 30 degrees caudal to IOML
Situation: A radiograph of a submentovertex projection of the cranium reveals that the mandibular condyles are projected into the petrous pyramids. What must be fixed?
Increase the extension of the skull
Situation: A radiograph of a PA axial projection (caldwell method) of the cranium reveals that the petrous ridges are located at the level of the lower 1/3 of the orbits. The tech performed this projection with the CR 15 degrees caudal to the OML. How must this be fixed?
None of the above; positioning was correct
Situation: A radiograph of a lateral projection of the cranium reveals that the orbital plates are not superimposed, 1 is slightly superior to the other. What is the error?
Situation: A radiograph of a lateral cranium reveals that the mentum was cut off from the bottom of the radiograph. A 10 x 12 IR was used and placed crosswise. What must be fixed for the repeat?
Nothing; Centering & IR placement were correct
Situation: A patient comes to radiology for a routine study of the cranium. He is unable to flex his head & neck sufficiently to place the OML perpendicular to the IR for the AP axial projection. What should the tech do to compensate for this problem without creating excessive magnification of the skull?
Use the IOML & increase CR angle by 7 degrees
Situation: A patient enters the ED with a possible basilar skull fracture. Which skull projection would best demonstrate any blood present in the sphenoid sinus?
Horizontal beam lateral projection
Situation: A patient comes to radiology with a history of a possible erosion of the foramen rotundum. Which projection would best demonstrate this structure?
PA axial with a 30 degree caudal angle to OML
Situation: A patient comes to radiology with a possible bone cyst within the squamous portion of the frontal bone. Which projection would best demonstrate this region with a minimal amount of distortion of the frontal bone?
AP axial with a 30 degree caudal angle to OML
Situation: A patient comes to radiology for a study of the sella turcica. Which routine projections would best demonstrate this structure?
AP Axial and Lateral
TRUE or FALSE: The PA Axial projection (HAAS method) fro the cranium requires a CR angle of 25 degrees Caudad
TRUE or FALSE: The submentovertex projection requires that the IOML is placed parallel to the IR
The skull projection with the highest thyroid dose
Situation: When using a 30 caudad angle for the AP Axial (Towne) projection of the skull, which positioning line should be perpendicular to the IR?
The cranial bone that is best demonstrated with a PA Axial (HAAS method) projection of the skull
The positioning error that is present if the mandible rami are not superimposed on a lateral skull
The projection of the cranium that produces an image of the frontal bone with little or no distortion
The aspect of the frontal bone that is thin walled & forms the forehead
Thickest and densest structure in the cranium
Name the Sutures of the Cranium
Squamosal, Coronal, Lambdoidal & Sagittal
The pterygoid hamulus is a part of this cranium bone
The perpendicular plate is a part of this cranium bone
The foramen ovale is a part of this cranium bone
The cribriform plate is a part of this cranium bone
The cranial suture formed by the inferior junction of the parietals to the temporal bones
The name of the paired collections of bone found inferior to the cribriform plate that contain numerous air cells & help form the lateral walls of the nasal cavity
Formal term for the left & right sphenoid fontanels in the adult
Left & right pterion
Formal term for the left & right mastoid fontanels in the adult
Left & right asterion
Formal term for the anterior fontanel in the adult
Formal term for the posterior fontanel in the adult
The small irregular bones that sometimes develop in adult skull sutures
Wormian or Sutural
Bacterial infection of the mastoid process
New or adnormal growth
Benign tumor of the auditory nerve sheath
Benign, cystlike mass or tumor of the middle ear
Growth arising from a mucous membrane
Fracture that may produce an air filled fluid level in the sphenoid sinus
Basal skull fracture
The aspect of the temporal bone that contains the organs of hearing & balance
The opening between the epitympanic recess & the mastoid portion of the temporal bone
The structure that helps equalize atmospheric pressure in the middle ear
the structures that appear as scroll-like projections on a radiograph and found in the nasal cavity
2 Bones form the bony nasal septum
Ethmoid and Vomer
Posterior aspect of the orbit
The number of facial bones that help make up the bony orbit