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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Supercond Sci Technol. 2016 Nov 16;30(1):014007. doi: 10.1088/0953-2048/30/1/014007

Table 1.

Typical parameters of commercial whole-body MRI magnets

1.5 tesla 3 tesla
Length (including cryostat)1) 125 to 170 cm 150 to 180 cm
Patient bore 60 cm (standard bore) and 70 cm (wide bore)
Warm bore 82 to 93 cm
Outer diameter (including cryostat) 180 to 210 cm 180 to 210 cm
Design uniformity, 10 ppm peak-to-peak in ellipsoid 2)

  • 30 cm to 45 cm axial direction

  • 45 cm to 55 cm in radial direction
Stray field envelope - 5-gauss line (Z × R) 4 m × 2.5 m 5 m × 3 m
Long-term field decay <0.1% field loss a year

Notes:

1)

In further analysis, we assume that the cryostat length is 20 cm longer than the superconducting coils, and the outer diameter of the cryostat is 20 cm larger than the outer diameter of the coils. Although these lengths depend on the magnet design and cryogenic approach, the values above are within a typical range.

2)

The design uniformity in Table 1 assumes fully-shimmed magnet. Shorter magnets may have reduced field of view, especially in the axial direction.