The reverse Waters view is a modified alternative to the Waters view. However, skull radiographs are rapidly becoming obsolete in general, being replaced by much more sensitive CT scans.
On this page:
Indications
- trauma
- facial fractures
- acute sinusitis
Patient position
- the patient is supine
- the mid-sagittal plane is perpendicular to the image receptor
Technical factors
- acanthioparietal projection
-
centering point
- acanthion
- central beam angled 30° cephalad to be running parallel to the mentomeatal line
-
collimation
- superior to the skin margins
- inferior to include the most inferior aspects of the skull
- lateral to include the skin margin
-
orientation
- portrait
-
detector size
- 24 cm x 30 cm
-
exposure
- 75-80 kVp
- 20-25 mAs
-
SID
- 100 cm
-
grid
- yes (this can vary departmentally)
Image technical evaluation
- orbits are magnified
- petrous ridges are projected below the maxillary sinus
Practical points
- learn your skull positioning lines, it makes for reading position guides a lot easier
- this projection results in distorted anatomy and should hence only be used on patients unable to stand up
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