1. For a lateral projection of facial bones, the central ray should be
directed to the:
A. Zygomatic bone b) Nasion c) Glabella d) Mandibular angle
Answer: a) Zygomatic bone Rationale: The central ray is directed
to the zygomatic bone to ensure all facial bones are included in
the lateral projection.
2. The open-mouth Waters projection is used to evaluate which
structure?
A. Frontal sinuses b) Sphenoid sinuses c) Ethmoid sinuses d) Nasal
bones
Answer: b) Sphenoid sinuses Rationale: The open-mouth Waters
projection allows for visualization of the sphenoid sinuses through
the open mouth.
3. The lateral projection of the facial bones should include the:
A. Zygomatic bone at the center of the image b) Nasion and
glabella c) Frontal and sphenoid sinuses d) Orbital floor and
mandible
Answer: a) Zygomatic bone at the center of the image Rationale:
The zygomatic bone should be centered to ensure all facial bones
are included.
,4. In the modified Waters projection, the orbitomeatal line (OML)
forms what angle with the image receptor?
A. 37° b) 55° c) 30° d) 45°
Answer: b) 55° Rationale: The modified Waters projection
requires the OML to form a 55° angle with the image receptor to
better evaluate the orbital floor.
5. The main indication for performing a tangential projection of
the zygomatic arches is:
A. Facial symmetry evaluation b) Assessment of fractures c) Sinus
drainage studies d) Orbital floor assessment
Answer: b) Assessment of fractures Rationale: Tangential
projections isolate the zygomatic arches for detailed assessment of
fractures.
6. To demonstrate bilateral zygomatic arches in the SMV
projection, the patient’s head should be:
A. Tilted 15° toward the side of interest b) Extended until the
IOML is parallel to the image receptor c) Flexed until the chin is
on the table d) Rotated 25° away from the side of interest
Answer: b) Extended until the IOML is parallel to the image
receptor Rationale: The SMV (submentovertex) projection
requires the IOML to be parallel to the image receptor for
accurate visualization of the zygomatic arches.
, 7. In the reverse Waters projection, the central ray enters at the:
A. Acanthion b) Mentum c) Glabella d) Nasion
Answer: a) Acanthion Rationale: The reverse Waters projection
aligns the central ray to enter at the acanthion.
8. For a lateral projection of the nasal bones, the central ray
should be directed:
A. Perpendicular to the nasion b) Perpendicular to the glabella c)
Perpendicular to 1 inch distal to the nasion d) Parallel to the
infraorbitomeatal line (IOML)
Answer: a) Perpendicular to the nasion Rationale: The lateral
nasal bone projection requires the central ray to be perpendicular
to the nasion for proper visualization.
9. In a lateral facial bones projection, the plane of the head
parallel to the image receptor is:
A. Midsagittal plane (MSP) b) Coronal plane c) Transverse plane
d) Frontal plane
Answer: a) Midsagittal plane (MSP) Rationale: The MSP must be
parallel to the image receptor for a proper lateral projection.
10. The open-mouth Waters projection is often used to identify
pathology in the:
directed to the:
A. Zygomatic bone b) Nasion c) Glabella d) Mandibular angle
Answer: a) Zygomatic bone Rationale: The central ray is directed
to the zygomatic bone to ensure all facial bones are included in
the lateral projection.
2. The open-mouth Waters projection is used to evaluate which
structure?
A. Frontal sinuses b) Sphenoid sinuses c) Ethmoid sinuses d) Nasal
bones
Answer: b) Sphenoid sinuses Rationale: The open-mouth Waters
projection allows for visualization of the sphenoid sinuses through
the open mouth.
3. The lateral projection of the facial bones should include the:
A. Zygomatic bone at the center of the image b) Nasion and
glabella c) Frontal and sphenoid sinuses d) Orbital floor and
mandible
Answer: a) Zygomatic bone at the center of the image Rationale:
The zygomatic bone should be centered to ensure all facial bones
are included.
,4. In the modified Waters projection, the orbitomeatal line (OML)
forms what angle with the image receptor?
A. 37° b) 55° c) 30° d) 45°
Answer: b) 55° Rationale: The modified Waters projection
requires the OML to form a 55° angle with the image receptor to
better evaluate the orbital floor.
5. The main indication for performing a tangential projection of
the zygomatic arches is:
A. Facial symmetry evaluation b) Assessment of fractures c) Sinus
drainage studies d) Orbital floor assessment
Answer: b) Assessment of fractures Rationale: Tangential
projections isolate the zygomatic arches for detailed assessment of
fractures.
6. To demonstrate bilateral zygomatic arches in the SMV
projection, the patient’s head should be:
A. Tilted 15° toward the side of interest b) Extended until the
IOML is parallel to the image receptor c) Flexed until the chin is
on the table d) Rotated 25° away from the side of interest
Answer: b) Extended until the IOML is parallel to the image
receptor Rationale: The SMV (submentovertex) projection
requires the IOML to be parallel to the image receptor for
accurate visualization of the zygomatic arches.
, 7. In the reverse Waters projection, the central ray enters at the:
A. Acanthion b) Mentum c) Glabella d) Nasion
Answer: a) Acanthion Rationale: The reverse Waters projection
aligns the central ray to enter at the acanthion.
8. For a lateral projection of the nasal bones, the central ray
should be directed:
A. Perpendicular to the nasion b) Perpendicular to the glabella c)
Perpendicular to 1 inch distal to the nasion d) Parallel to the
infraorbitomeatal line (IOML)
Answer: a) Perpendicular to the nasion Rationale: The lateral
nasal bone projection requires the central ray to be perpendicular
to the nasion for proper visualization.
9. In a lateral facial bones projection, the plane of the head
parallel to the image receptor is:
A. Midsagittal plane (MSP) b) Coronal plane c) Transverse plane
d) Frontal plane
Answer: a) Midsagittal plane (MSP) Rationale: The MSP must be
parallel to the image receptor for a proper lateral projection.
10. The open-mouth Waters projection is often used to identify
pathology in the:
