<prompt> A 50 year old male patient complains of heaviness of face, headache and blocked nose. Patient gives history of chronic sinusitis. Waters view x-ray was taken. If the patients mouth is open during x-ray, the sphenoid sinus is seen superimposed over-Nasal boneCoronoid processMaxillary sinusPalate  <response>: Waters view- The image receptor is placed in front of the patient and perpendicular to the midsagittal plane. The patients head is tilted upward so that the canthomeatal line forms a 37-degree angle with the image receptor. If the patients mouth is open, the sphenoid sinus is seen superimposed over the palate.White and Pharoah, Oral radiology, ed 7th, pg-161 