The magnetization subtraction technique (MS), which is equivalent to t
he inversion recovery technique in strong magnetic fields, has been im
plemented in dynamic nuclear polarization-enhanced magnetic resonance
imaging (DNPI), The general theoretical basis of the MS method, which
can be applied to DNPI or to prepolarized MRI in weak magnetic fields
(such as Earth's magnetic field), is introduced, Details are provided
about the signal amplitude, dynamic range of the method, and condition
s required to observe signal void in samples with specific T-1 relaxat
ion times, The experimental results obtained with MS DNPI are presente
d and discussed, In the experiments, electron spin resonance irradiati
on frequencies of 199 MHz and 16.2 MHz were employed, Also, T-1 contra
st manipulation in the polarizing and in the detection magnetic field
is discussed and demonstrated for MS DNPI.