Inclusion Criteria:  Histologically confirmed prostate carcinoma with tissue classification according to Gleason score and PSA low- or intermediate-risk carcinoma according to d'Amico criteria or early high-risk Carcinoma (cT3a and / or GS ≤ 8 and / or PSA ≤ 20ng / ml) IPSS (International Prostate Symptom Score) max. 12 Prostate volume <80cm³ Karnofsky index ≥ 70% Age ≥ 18 years Patient information provided and written consent Ability of the patient to give consent  Exclusion Criteria:  Previous radiotherapy in the pelvis Previous local therapy of the prostate lymphogenic metastasis Stage IV (distant metastases) Contraindication to MRI Simultaneous participation in another clinical study which could influence results of either of the respective study