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MRC 800 X-ray tube technology

White Paper
Philips CT Marketing Philips Healthcare USA

To meet the current and future demands in Multislice CT, Philips has upgraded its existing MRC X-ray tube technology. The result is the Philips MRC 800, a high performance CT X-ray tube with metal/ceramic technology and a noiseless, wear-free spiral groove bearing.


The 200 mm graphite-backed anode disk used on the MRC 800 has a very high maximum heat loading capacity, direct heat conduction and a large surface area for rapid heat dissipation. Additionally, the anode is directly cooled through the patented spiral groove bearing, giving the MRC 800 heat management capability far superior to a conventional ball bearing design. This capability is further supported by the large heat capacity of the housing assembly and the efficient heat exchanger.


Why does Philips Medical Systems state an "Effective Heat Storage Capacity" in addition to the maximum anode heat storage capacity according to the IEC 613-Standard?


High performance X-Ray tubes are often ranked just by their maximum anode heat storage capacity. But, though the anode may be of the same size, Philips MRC tubes allow much faster cooling than a conventional tube. The spiral groove bearing with a large area liquid metal contact provides an additional heat sink of strong direct heat conduction. Also, the metal tube envelope draws energy of scattered electrons away from the anode, so the anode stays cooler and cools faster. This is not reflected by the traditional IEC terminology. To ease a one-to-one comparison of conventional and MRC tubes, we exactly calculated the "Effective Heat Storage Capacity", measured in MHUeff. Now, tubes can easily be compared. And the results are remarkable.


The second generation of MRC high performance CT tubes has been updated to effectively manage gantry rotation times shorter than 0.4 sec. with motion-free focal spot performance. Motion-free focal spot guarantees optimized image quality in ultra-high spatial resolution with Multislice CT. The Dynamic Focal Spot (DFS) doubles the data sampling density from the detectors and allows for artifact-free ultra-high spatial resolution in axial and spiral scanning. As a result, the MRC 800 is ideally suited to the specific requirements of Philips new Brilliance CT 40-channel configuration.


The tube is installed in the X-ray tube housing ROT 5006 and is available as a complete tube housing assembly. The heat exchanger CU 6100 is available separately.

Technical data

  • 60 kW maximum tube power

  • 85 kW (small) and 120 kW (large) nominal anode input power (IEC 60613)

  • 26 MHUeff effective heat storage capacity

  • 8 MHU anode heat storage capacity (IEC 60613)

  • 12 MHU maximum heat content of assembly

  • 6.1 kW maximum continuous heat dissipation

  • 200 mm anode disc diameter

  • 7 degree anode angle

  • 0.5 x 1.0 (small) and 1.0 x 1.0 (large) focal spot size (IEC 60336/93)

  • 90, 120, 140 kV tube voltages

  • 20 - 500 mA tube current

  • High g-forces spiral groove bearing, directly cooled anode

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Jul 8, 2005

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Brilliance 40-channel
Brilliance Version 1.2

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