In the present paper, we have explained the phenomenological level density models to utilize it in the production of positron emission tomography (PET) radioisotopes. To achieve this aim, the cross-sections of reaction processes were calculated by TALYS code for the level density models. Additionally, to estimate the production of PET radioisotopes, the integral yield curves of reactions for three different level density models were calculated using the mass stopping power obtained from X-PMSP program in the particle beam current of 1 mu A and irradiation time 1 h. Based on these results, we discussed the suitable level density model for the production of PET radioisotopes.