Multidetector computed tomography (MDCT) expanded the volume coverage per gantry rotation and revolutionized the imaging of many body regions. The most dramatic advances in MDCT technology profited from the increase in the number of detector rows. In general, the wider the detector, the larger the anatomical coverage. The dimension of the detector can be calculated by multiplying the width of a single detector’s element by the number of elements. Currently, the widest anatomical coverage is 16 cm and it is obtained using a 320-slice detector with 0.5-mm slice thicknesses (320 × 0.5 mm = 16 cm).