Table I.

Range and Bragg peak width of a 148.2 MeV proton beam in water, determined using the in‐house developed water phantom (MR phantom) with and without magnetic fields, a commercial water phantom (reference), and Monte Carlo (MC) simulations.

Energy (MeV)	Measurement	Field strength (T)	$R_{80}$ (mm)	$BP{W}_{80}$ (mm)
148.2	MR phantom	0	150.2	4.1
		1	149.4	4.1
	Monte Carlo	0	150.2	4.2
		1	149.5	4.2
	Reference	0	150.2	4.2