practice questions : Ch 11

which projection is used to best demonstrate the petrous ridges in a standard skull radiograph

A. PA

B. Lateral

C. AP Axial (Towne)

D. Submentovertical (SMV)

C. AP Axial

which of the following projections is commonly used to demonstrate the nasal bones

A. Townes

B. Lateral

C. Caldwell

D. SMV

B. Lateral

which projection is used to demonstrate the orbits in a way that minimizes distortion of the inferior orbital margins

A. Lateral

B. PA Caldwell

C. Parietocanthial (Waters)

D. Modified waters

D. Modified waters

for a lateral projection of the skull, the central ray is directed to which point

A. 1 inch below the external auditory meatus (EAM)

B. 2 inches above the EAM

C. the EAM

D. at the level of the nasion

B. 2 inches above the EAM

which projection is best for demonstrating the zygomatic arches in the skull

A. AP Axial (Towne)

B. SMV

C. Tangential

D. Lateral

C. Tangential

which projection of the skull demonstrates the sphenoid sinuses in their entirety

A. PA

B. Lateral

C. AP Axial (Towne)

D. Caldwell

D. Caldwell

In a pa projection of the skull with no tube angle, the petrous ridges should be demonstrated at which level

A. lower 1/3 of the orbits

B. just below the orbits

C. through the orbits

D. below the maxillary sinuses

C. through the orbits

in an AP axial (towne) projection of the skull, the central ray should be directed at which angle

A. 10 cephalad

B. 30 caudad

C. 15 caudad

D. 25 caudad

B. 30 caudad

which of the following projections would best demonstrate the maxillary sinuses

A. PA

B. Parietoacanthial (Waters)

C. AP Axial (Towne)

D. Lateral

B. Parietoacanthial (Waters)

what positioning error would result in the separation of the orbital roofs/floor in a lateral skull projection

A. Rotation

B. Tilt

C. Too much extension

D. Insufficient extension

B. Tilt

for the axiolateral projections of the mandible, which head rotation would best demonstrate the mentum of the mandible

A. true lateral

B. 30

C. 15

D. 45

D. 45

for the lateral projection of the facial bones, what positioning line is perp. to the front edge of the IR

A. IOML

B. MML

C. OML

D. LML

A. IOML

the modified waters projection fro facial bones involves angling the patient’s head how many degrees from the OML

A. 15 degrees

B. 30 degrees

C. 37 degrees

D. 45 degrees

C. 37 degrees (same as MML)

which of the following projections is performed to demonstrate the temporomandibular joints (TMJs)

A. waters

B. lateral

C. axiolateral oblique

D. SMV

C. axiolateral oblique

which of the following projections of the skull will best show the frontal sinuses

A. lateral

B. PA caldwell

C. Ap Axial

D. Parietocanthial (waters)

C. Ap Axial

what is the recommended central angle for the AP Axial (Towne) projection to demonstrate the skull if the patient’s IOML is perp. to the IR

A. 20 cephalad

B. 15 caudad

C. 37 caudad

D. 42 cephalad

C. 37 caudad

which projection best demonstrates the petrous ridges below the maxillary sinuses

A. 30 caldwell

B. 15 caldwell

C. lateral

D. parietoacanthial (waters)

D. parietoacanthial (waters)

what projection of the sinuses will demonstrate a profile of all the sinuses

A. Lateral

B. SMV

C. Waters

D. Caldwell

A. Lateral

which of the following projections is used for the demonstration of the TMJs where the head is in a true lateral and the tube is angled to separate the TMJs

A. Schuller Method

B. Modified Law Method

C. Townes

A. Schuller Method

in a waters projection, how should the patient be positioned

A.MSP parallel to IR

B.MCP parallel to IR

C. IOML perp to front edge of IR

D. MML perp to IR

D. MML perp to IR

which projection is perfomred to best demonstrate the mandible in profile

A. AP Axial

B. Lateral

C. PA Axial

D. SMV

B. Lateral

which pathology describes a fracture when a patient has been struck straight on in the orbit

A. Blowout Fx

B. Tripod Fx

C. Le Fort Fx

D. Foreign Body Fx

A. Blowout Fx

which of the following is the correect central ray angle for the caldwell projectin to demonstrate the frontal sinuses

A. 15 caudad

B. 25 cephalad

C. 30 caudad

D. 10 cephalad

A. 15 caudad

what anatomy Is demonstrated with the AP Axial (Towne) projection for the skull

A. to demonstrate the nasal septum

B. to demonstrate the occipital bone

C. to demonstrate the temporal bone

D. to visualize the sphenoid sinuses

B. to demonstrate the occipital bone

which of the following is the best position for an SMV projection

A. the patient is supine with the chin extended

B. the patient is seated erect with the chin tucked

C. the patient is supine with the head flexed

D. the patient is seated with the chin extended

D. the patient is seated with the chin extended

for a lateral projection of the nasal bones, where should the central ray be directed

A. ½ inch below the nasion

B. 1 inch above the EAM

C. 1 inch posterior to the outer canthus

D. 1 inch below the chin

A. ½ inch below the nasion

what projection demonstrates the entire mandible, including both condyles and rami

A. Ap axial

B. axiolateral oblique

C. SMV

D. Lateral

B. axiolateral oblique

for a PA projection of the mandible, what central ray direction should be used

A. 10 caudad

B. 20 cephalad

C. 15 cephalad

D. perp to the IR

D. perp to the IR

in a lateral projection of the skull, how should the patients head be positioned

A. tilted anteriorly

B. tilted posteriorly

C. true lateral position, with the IPL perp. to the IR

D. rotated 45 degrees

C. true lateral position, with the IPL perp. to the IR

for the caldwell projection of the sinuses, what should be the central ray angle

A. 0

B. 10 cephalad

C. 25 caudad

D. 15 caudad

A. 0