Purpose: The aim of this study is to assess 3D TOF MR angiography pre and post MIP algorithm for the detection and characterisation of intracranial aneurysms using IA DSA as the "gold standard" for the presence, location and size of aneurysms and the detection of the neck of aneurysms. Materials and methods: In 40 patients, 25 women, 15 men, age range 14-69 years, mean age 46,8 years, with nontraumatic intracranial hemorrhage, were diagnosed aneurysms on 1.0 T MR unit using 3D TOF MR angiography, evaluating pre and post MIP algorithm, and they were correlated with IA DSA findings. Results: 43 aneurysms were finded in 40 patients. 7 were 3-5 mm large. Size of aneurysms and direction of the neck were in agreement in all 7 with IA DSA. 20 aneurysms were 5-12 mm large. Size of aneurysms was in agreement in all 20 in pre MIP evaluation, 18 in post MIP evaluation. The direction of the neck was in agreement with IA DSA in alll 20 in pre MIP, in 19 in post MIP. 16 anerysms were larger then 12 mm. The agreement in size were in all in pre MIP, and only in 8 in post MIP. 4 of those had no neck. The direction of the neck were in agreement with IA DSA in rest (12) in pre MIP, and only in 6 in post MIP 3D TOF angiography. Conclusion: 3D TOF MR angiography pre and post MIP algorithm is reliable tool in intracranial aneurysms elvaluation for the presence, location and size of aneurysms and detection of the neck of aneurysm. The evaluation of pre MIP algorithm 3D TOF MRA provide useful informations about size of aneurysm and detection of the neck aneurysms larger then 12 mm.