What is the primary purpose of the detector array in computed tomography (CT)?

The primary purpose of the detector array in computed tomography (CT) is to measure and convert transmitted radiation into an electrical signal. In the CT imaging process, X-rays pass through the body and are attenuated by different tissues to varying degrees. The detector array captures the transmitted X-rays that have passed through the patient and converts this information into electrical signals. This conversion is essential as it translates the amount of radiation detected into a format that can be processed by the CT system.

These electrical signals are then used to create a digital representation of the scanned area, which is vital for subsequent steps in image reconstruction. This process enables radiologists to visualize internal structures, helping in diagnosis and treatment planning. The efficiency and accuracy of the detector array are crucial for producing high-quality images, which makes its primary role in measuring and converting radiation fundamental to the entire CT imaging process.