Release time : 2015-06-15 08:46:12
NTN Corporation (hereafter NTN) has developed a new Low Vibration Ceramic Bearings for use in CT scanners. The new bearing uses an integral dynamic dampener for reducing gantry vibration.
NTN has been supplying bearings for medical CT scanner gantries* to customers in Japan and overseas. Demands for these bearings are expected to increase further due to an aging society, developments in Brazil, Russia, India and China as well as the expanded use of CT scanners in small and medium-sized hospitals to enhance medical care.
In the CT scanner a rotating body called the gantry, which includes the imaging equipment such as the X-ray tube and detection device, is supported by a Skateboard Bearings and frame. The weight of the CT scanner is constrained by the ability of the floor to carry the weight of the machine. In an effort to open more locations for CT scanners, manufacturers are looking for ways to simplify and reduce the weight of the frame. Unfortunately this can cause an increase in vibration affecting the imaging accuracy of the CT scanner.
NTN developed the Low Vibration Bearing for use in CT scanners to address these concerns. NTN installed an integral dynamic dampener to reduce vibration in the gantry. One important aspect of this development is that the Needle Roller Bearings dimensions remain the same as the conventional bearing. No additional space is necessary on the gantry for housing the dynamic dampener.
(1) Vibration amplitude of gantry frame with new bearing: Approximately 1/2 when compared with the conventional bearing.
(Drastic constraint of gantry vibration)
(2) Envelope dimensions of new bearing: Same as conventional bearing
CT scanner gantry support bearing
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Industrial Product Planning Dept., Industrial Product H.Q.
*Gantry : A component of the CT Scanner composed of a fixed frame and a movable section that rotates around the patient body. The rotating body is equipped with the X-ray tube and imaging device.