27 August 2017 to 1 September 2017
RAI Congress Center, Amsterdam, The Netherlands
Europe/Amsterdam timezone

Hub- and Site-cooling of MRI magnets using a mobile cryogenic system

31 Aug 2017, 10:00
15m
G102-103 Room

G102-103 Room

Regular 15 minutes Oral Presentation H1 - Cryostats and Cryogenics Thu-Mo-Or29

Speaker

Dr Anders Mortensen (Siemens Magnet Technology)

Description

We present a compact, mobile pre-cooling cryogenic system (cooler) developed by Sumitomo Cryogenics as a solution that can significantly reduce helium losses associated with shipping medical MRI magnets globally. In contrast to conventional cold-shipping of MRI magnets, the cooler can enable MRI magnets to be shipped with the cryostat at room temperature, and then pre-cooled either during the installation at the hospital (site-cooling), or at a local facility (hub-cooling). This logistics model dramatically reduces the helium boil-off losses normally incurred when the MRI magnet is in transit. Compared to using liquid nitrogen for pre-cooling, the cooler pre-cools to a lower temperature (~25 K), which effectively eliminates the helium loss that is incurred when cooling the MRI cryostat further to 4K. An example of using the cooler at a hub-cooling facility in Brazil is discussed in this paper. This facility pre-cools warm-shipped magnets from a Siemens MRI factory in Shenzhen, China, using a prototype of the cooler technology. The cooler comprises of five separate mobile units with a compact footprint that enables its use in a standard MRI room. It uses helium gas as a heat transfer fluid in a closed-loop circuit between the magnet cryostat and four GM cryocoolers with heat exchangers that provide the cooling of the gas. The helium gas is circulated between the cooler and the MRI cryostat by means of a cryogenic centrifugal fan. The processes for MRI magnet pre-cooling, helium gas circuit cleaning and system performance test are fully controlled and automated by the system software.

Submitters Country United Kingdom & United States

Primary authors

Dr Anders Mortensen (Siemens Magnet Technology) Mr Santhosh Kumar Gandla (Sumitomo (SHI) Cryogenics of America Inc.)

Co-authors

Dr Adam Johnstone (Siemens Magnet Technology) Mr Bruce Sloan (Sumitomo (SHI) Cryogenics of America Inc.) Mr Dave Gubbins (Siemens Magnet Technology) Dr Ian Wilkinson (Siemens) Mr Jeff Lyness (Siemens Magnet Technology) Mr Phil Walton (Siemens Magnet Technology) Dr Ralph Longsworth (Sumitomo (SHI) Cryogenics of America Inc.)

Presentation Materials