Computed tomography apparatus, manufacturing method thereof and operating method thereof

A manufacturing method of a computed tomography apparatus where a total of N sources that generate a fan beam type x-ray are arranged at different angles to each other on a virtual circumference overlapping along a transfer direction of a test subject and where a total of N detectors are arranged on opposite sides on the circumference corresponding to each of the sources in order to detect a transmitted ray of the test subject, comprising the following steps:

• (a) obtaining N arrangement angles for arranging the N sources based on a spaced angle of 360/N degrees;
• (b) determining an order of arrangement angles of the N sources such that the angle between one pair of adjacent sources is within a range of 90 to 180 degrees;
• and
• (c) arranging the N sources according to the arrangement angles determined at the step (b).

An operating method of a computed tomography apparatus, in a method of obtaining a computed tomographic image of a test subject by operating a total of L gantries where a total of N sources generating a fan beam type x-ray are installed on a circumference in equal intervals and a total of N detectors are installed on opposite sides on the circumference corresponding to each of the source in order to detect a transmitted ray of the test subject, comprising the following steps:

• (a) setting an operating order of the source and detector per each gantry;
• (b) at the time of t=t1, simultaneously operating a first source of a first gantry, . . . , a first source of an L gantry, set as a first operating order, and detecting data of the transmitted ray at a first detector of the first gantry, . . . , the first detector of the L gantry;
• and
• (c) at the time of t=t1+n Δt (but, 0≤n≤N), simultaneously operating the nth source of the first gantry, . . . , the nth source of the L gantry at Δt/L intervals according to the set operating order, and sequentially detecting the data of the transmitted ray at the nth detector of the first gantry, . . . , the nth detector of the L gantry (Δt being the time which it takes to have a tomographic image from data obtained by transmitting an x-ray irradiated by the source once through the test subject and then detecting the transmitted-ray by the detector),
• at the step (a), the operating order of the source and detector is set such that the angle between one pair of adjacent sources of the plurality of sources operating simultaneously is 90 to 180 degrees.