In computed tomography (CT), what component includes the X-ray tube and detectors arranged on a circular path?

In computed tomography (CT), what component includes the X-ray tube and detectors arranged on a circular path?

• A. X-ray tube and detectors on circular path in CT
• B. MRI magnet and coils
• C. PET ring
• D. Ultrasound probe

Answer: (A)

In CT, the X-ray tube and the detector array are mounted on a rotating structure that encircles the patient. This circular path, known as the gantry, allows the tube to emit X-rays from many angles while detectors simultaneously measure how much radiation passes through the body. By collecting projections from all around the patient as the gantry spins, the system can reconstruct cross-sectional images. Other modalities don’t use this same arrangement: MRI relies on a strong magnet and coils, PET uses a ring of gamma detectors for tracer imaging, and ultrasound uses a handheld transducer. So the setup described—X-ray tube and detectors on a circular path—defines the CT gantry.

In CT, the X-ray tube and the detector array are mounted on a rotating structure that encircles the patient. This circular path, known as the gantry, allows the tube to emit X-rays from many angles while detectors simultaneously measure how much radiation passes through the body. By collecting projections from all around the patient as the gantry spins, the system can reconstruct cross-sectional images. Other modalities don’t use this same arrangement: MRI relies on a strong magnet and coils, PET uses a ring of gamma detectors for tracer imaging, and ultrasound uses a handheld transducer. So the setup described—X-ray tube and detectors on a circular path—defines the CT gantry.