36 CFR Part 1195 Standards for Accessible Medical Diagnostic Equipment

M301.2.3.2 Side Transfer Surface.

Side transfer surfaces shall be 28 inches (710 mm) wide minimum and 28 inches (710 mm) long minimum.

EXCEPTION: Transfer surfaces for imaging equipment with bores shall be permitted to be 21 inches (535 mm) wide minimum but shall not be permitted to be less than the full width of the examination surface provided for the patient.