A therapeutic system, comprising: a MR imaging unit arranged to acquire MR signals from a patient in an examination volume, and a thermal treatment unit for depositing thermal energy within tissue of the patient. The system is arranged for: initiating a thermal treatment by heating the tissue at a focus within the examination volume selectively acquiring MR signals from a first image plane, including the focus, reconstructing a thermographic MR image from the MR signals acquired from the first image plane, computing a baseline thermographic MR image from a temperature distribution within at least one second image plane, moving the focus to a new position within the examination volume, changing the position and/or orientation of the first image plane corresponding to the new position of the focus, repeating the acquiring and reconstructing steps, wherein the baseline thermographic MR image is used for thermographic image reconstruction in a subsequent reconstructing step.
