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
CBCT stands for 
Select and explain. 
A. Cone beam computed tomography, B. Coil beam computed tomography, C. Combined beam computed tomography, D. Circular beam computed tomography
A: Cone beam computed tomography
Answer: A: Cone beam computed tomography 
Explanation: Cone-beam computed tomographic (CBCT) imaging is the most significant technologic advance in maxillofacial imaging since the introduction of panoramic radiography. CBCT imaging was initially developed commercially for angiography in the early 1980s. It uses a divergent cone-shaped or pyramid-shaped  source of ionizing radiation and a two-dimensional area detector fixed on a rotating gantry to provide multiple sequential transmission images that are integrated directly, forming volumetric  information.