Flashcards
Chapter 20 Paranasal Sinuses
Cards in this deck (23)
- 1air-filled cavities located in the frontal, , ethmoid, and sphenoid bones of the cranium, as well as the maxillae of the faceParanasal Sinuses
- 2Named because...their formation from the nasal muscosa and their continued communication with the nasal fossae
- 3What are the functions of the sinuses1) serve as a resignating chamber for voice
2) decrease weight of skull
3) aid in warming and moisturizing inhaled air
4) act as shock absorbers in trauma
5) possibly control immune system - 4At what age do frontal and sphenoid begin to develop?ages 6-7
- 5At what age does the ethmoid fully develop?17-18
- 6Which sinuses are the only ones present at birth?Maxillary
- 7Lateral Projection Part PositionMidsagittal plane (MSP) of head parallel with IR plane
Interpupillary line (IPL) perpendicular to IR plane
Infraorbitomeatal line (IOML) perpendicular to front edge of IR - 8Lateral Projection Central RayHorizontal and perpendicular to IR
Enters ½ to 1 inch (1.3 to 2.5 cm) posterior to outer canthus
Center IR to CR - 9PA Axial (Caldwell Method) Angled Grid Technique Part PositionTilt vertical Bucky down 15 degrees
Rest patient’s forehead and nose on device
Center nasion to IR
MSP and orbitomeatal line (OML) perpendicular to IR plane - 10PA Axial (Caldwell Method) Vertical Grid Technique Part PositionSame as other but...
Position patient’s OML at 15-degree angle to horizontal CR - 11PA Axial (Caldwell Method) Central RayHorizontal
Exits nasion
Center IR and CR - 12Parietoacanthial Projection (Waters Method) Part PositionHyperextend neck to place OML at 37-degree angle from IR plane
MSP and mentomeatal line (MML) perpendicular to IR plane - 13Parietoacanthial Projection (Waters Method) Central RayHorizontal
Exits acanthion - 14Parietoacanthial Projection (Open-Mouth Waters Method) Part PositionHyperextend neck to place OML at 37-degree angle from IR plane
MSP and MML perpendicular to IR plane
Open mouth wide while holding position - 15Parietoacanthial Projection (Open-Mouth Waters Method) Central RayHorizontal
Exits acanthion - 16SMV Projection Part PositionHyperextend neck and rest vertex of head on vertical grid device
MSP perpendicular to IR plane
Neck extended to place IOML parallel to IR plane - 17SMV Projection Central RayHorizontal and perpendicular to IOML
Enters MSP ¾ inch (1.9 cm) anterior to level of external acoustic meatus (EAM) - 18What does the lateral projection of the d sinuses demonstrate?All four sets of sinuses
Anteroposterior (AP) and superoinferior dimensions of paranasal sinuses
Thickness of frontal bone
Detail of side closer to image receptor (IR) - 19what does the PA Axial Projection (Caldwell Method) of the sinuses demonstrate?Frontal sinuses above frontonasal suture
Anterior ethmoid air cells
Sphenoid sinuses seen through nasal fossa below or between ethmoids
Petrous pyramids in lower third of orbits - 20what does the Parietoacanthial Projection (Waters Method) of the sinuses demonstrate?Maxillary sinuses
Petrous pyramids lying inferior to maxillary floor
Frontal and ethmoid sinuses are distorted - 21what does the Parietoacanthial Projection (Open-Mouth Waters Method) of the sinuses demonstrate?Sphenoid sinuses through open mouth
Maxillary sinuses
Petrous pyramids lying inferior to maxillary floor - 22what does the SMV Projection of the sinuses demonstrate?Sphenoid and ethmoid sinuses
Mandible
Bony nasal septum - 23—
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- Radiologic Technology Flashcards on Chapter 20 Paranasal Sinuses , created by Leah Fox on 31/07/2017.
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