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': 'A Gamma camera is used for \nSelect and explain. \nA. Imaging organs, B. To scan surface of tumor, C. To measure surface contamination, D. To image radioactivity emitted from organs', 'role': 'user'}, {'content': "Answer: D \nExplanation: Gamma Camera (Aka Scintillation Camera or Anger Camera) It is used to image gamma radiation emitting radioisotopes.\nThis technique is known as scintigraph.\nGamma camera is able to detect and make images from the very small amounts of ionising radiation emitted from patients having a nuclear medicine study.\nThe gamma camera detects radioactive energy that is emitted from the patient's body and converts it into an image.\nThe gamma camera does not emit any radiation.\nThe gamma camera is composed of radiation detectors, called gamma camera heads.\nThe most common type of gamma camera is the single-headed system.\nit consists of a gamma camera detector mounted on a gantry that allows the camera head to be positioned in a flexible way over different regions of the patient’s body.\nDual-headed gamma cameras are becoming increasingly popular.\nIn these systems, two gamma camera heads are mounted onto the gantry.\nAlso Note: SPECT involves the rotation of the gamma camera heads around the patient's body to produce more detailed, three-dimensional images.", 'role': 'assistant'}]