<prompt> A 50 year old male patient complains of heaviness of face, headache and blocked nose. Patient gives a history of chronic sinusitis. Waters view X-ray was taken. The patient position in this X-ray is:Canthomeatal line parallel to filmCanthomeatal line at 37o with filmCanthomeatal line at -30o with filmCanthomeatal line at 10o with film  <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 