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Application of nanoparticles in biomedicine is a very important direction in targeted therapy and diagnosis of cancer. The possibility of NPs to circulate in bloodstream, penetrate deep into tissues and cells can be used in biomedicine. However, it is necessary to take into account the safety of the used NPs. Silicon (Si) NPs seem to be a promising material for biomedicine. It is shown that NPs dissolve into orthosilicic acid Si(OH)4 and then it is excreted from the body within four weeks through urinary system. Si NPs can be used as contrast agents for magnetic resonance imaging (MRI). We study porous and nonporous Si NPs as potential agents for enhancement of the proton spin relaxation in water.