This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
[{'content': "The type of radiographic projection given below is: \nSelect and explain. \nA. PA view, B. Reverse towne's view, C. Submentovertex view, D. Waters projection", 'role': 'user'}, {'content': "Answer: B \nExplanation: Reverse towne's view\nImage Receptor and Patient Placement\nThe image receptor is placed in front of the patient, perpendicular to the midsagittal plane and parallel to the coronal plane. The patient’s head is tilted downward so that the canthomeatal line forms a 25-degree to 30 degree angle with the image receptor. To improve the visualization of the condyles, the patient’s mouth is opened, so that the condylar\xa0 heads are located inferior to the articular eminence. When requesting this image to evaluate the condyles, it is necessary to specify “open-mouth, Reverse-Towne”; otherwise, a standard Towne view of the occiput may result.\nPosition of Central X-Ray Beam\nThe central beam is perpendicular to the image receptor and parallel to the patient’s midsagittal plane and is centered at the level of the condyles.\nResultant Image\xa0\nThe midsagittal plane (represented by an imaginary line extending from the middle of the foramen magnum and the posterior arch of the atlas through the middle of the bridge of the nose and the nasal septum) should divide the skull image in two symmetric halves. The petrous ridge of the temporal bone should be super-imposed at the inferior part of the occipital bone, and the condylar heads should be projected inferior to the articular eminence.\nWhite and Pharoah, Oral radiology, ed 7th, pg- 163", 'role': 'assistant'}]