
67-6 Medical, Biomedical, and Health
To increase acquisition speed, second-generation scanners used several detectors in limited fan-beam
geometry. ird-generation CT scanners, which are the most common in use today, utilize a large fan
array of detectors (852 elements in a current scanner), which completely encompasses the patient and
allows slice acquisition times of about 1 s [21]. e x-ray tube and the detector fan array are mechanically
coupled and rotate together at high speed (Figure 67.3).
e implementation of electronic slip rings, which allow continuous electric contact, has removed the
physical restriction imposed by the high-voltage ...