X-ray computed tomography has become a prominent tool for cardiac imaging due to the introduction of multislice computed tomography. This prominence has grown progressively with successive breakthroughs in volume coverage and temporal resolution. One example of a multislice CT is the Aquilion ONE by Toshiba. As designed, the Aquilion ONE allows imaging of the entire heart within a single heartbeat using a circular scan with a wide cone angle that axially covers 16 cm at a rotation speed of 350 ms per turn. Toshiba's technology progresses are followed closely by Philips that advertises a 128-row commercial product with a rotation speed of 250 ms per turn (The Ovation, from the Brilliance iCT line) and that also advertises a 256-row prototype scanner.