Free shielding tool · preliminary estimate
Calculate MRI Larmor frequency and a preliminary below-cutoff waveguide length estimate. It keeps MRI OEM, site RF survey, and shielding-vendor requirements visible.
Shielding vendor and physicist site survey required
The tool calculates Larmor frequency from field strength and uses a circular, air-filled waveguide approximation. It shows the approximate length corresponding to 100 dB only as a planning readout for a below-cutoff penetration.
It does not model the MRI OEM requirement, site RF survey, room construction, seams, doors, services, multiple penetrations, ventilation panel geometry, magnetic shielding, structural loads, shielding verification, or any project-specific material and thickness design.
This preliminary planning tool does not establish an MRI suite shielding requirement, a wall material, a wall thickness, or a construction specification. Confirm the MRI OEM requirement and site RF survey with a qualified physicist and shielding vendor before design, budgeting, procurement, or construction.
Open the source material and verify the requirements or values that apply to your situation.
Questions to verify
No. This is a preliminary educational estimate, not a construction or procurement specification. The MRI OEM, shielding vendor, and qualified physicist must establish and verify the project requirement.
No. AAPM records historical manufacturer specifications of 80 to 100 dB, and a cited MRI project specifies 100 dB at 128 MHz. Your MRI OEM and site RF survey control the actual requirement.
No. Room dimensions are planning notes for the printout only. They do not change the calculator outputs or replace a site-specific RF design.
Longlead flags public projects that may need specialist shielding scope before the need becomes a named buying event: on major federal projects, typically 9–18 months before the GC buys out your scope.
See Longlead for shieldingFree shielding tool · preliminary estimate
Calculate MRI Larmor frequency and a preliminary below-cutoff waveguide length estimate. It keeps MRI OEM, site RF survey, and shielding-vendor requirements visible.
Shielding vendor and physicist site survey required
The tool calculates Larmor frequency from field strength and uses a circular, air-filled waveguide approximation. It shows the approximate length corresponding to 100 dB only as a planning readout for a below-cutoff penetration.
It does not model the MRI OEM requirement, site RF survey, room construction, seams, doors, services, multiple penetrations, ventilation panel geometry, magnetic shielding, structural loads, shielding verification, or any project-specific material and thickness design.
This preliminary planning tool does not establish an MRI suite shielding requirement, a wall material, a wall thickness, or a construction specification. Confirm the MRI OEM requirement and site RF survey with a qualified physicist and shielding vendor before design, budgeting, procurement, or construction.
Open the source material and verify the requirements or values that apply to your situation.
Questions to verify
No. This is a preliminary educational estimate, not a construction or procurement specification. The MRI OEM, shielding vendor, and qualified physicist must establish and verify the project requirement.
No. AAPM records historical manufacturer specifications of 80 to 100 dB, and a cited MRI project specifies 100 dB at 128 MHz. Your MRI OEM and site RF survey control the actual requirement.
No. Room dimensions are planning notes for the printout only. They do not change the calculator outputs or replace a site-specific RF design.
Longlead flags public projects that may need specialist shielding scope before the need becomes a named buying event: on major federal projects, typically 9–18 months before the GC buys out your scope.
See Longlead for shielding